California ADU Laws: Guide to 2025 Rules & Regulations, and download the free California ADU Handbook

As Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) emerge as essential components in addressing California's housing needs, understanding the current state laws is crucial for homeowners. The California Department of Housing and Community Development (HCD) continuously updates its guidance to reflect the evolving legal framework, aiming for clarity and consistency.

What are ADUs and JADUs?

An ADU is an attached or detached residential dwelling unit providing complete, independent living facilities for one or more persons on a lot with a proposed or existing primary residence. It must include permanent provisions for living, sleeping, eating, cooking, and sanitation. ADUs can take many forms, including efficiency units and manufactured homes.

A JADU, on the other hand, is a smaller unit, no more than 500 square feet, that is contained entirely within a single-family residence. A JADU can have separate sanitation facilities or share them with the existing structure. Only one JADU is permitted per lot zoned for single-family residences.

The Benefits of Building an ADU in California

ADUs offer a wide range of advantages for California homeowners and the state's housing supply:

• Affordability: ADUs are an affordable type of home to construct because they do not require paying for land, major new infrastructure, structured parking, or elevators. They are often built with cost-effective wood frame construction, which is significantly less costly than new multifamily infill buildings.

• Income Potential: ADUs can serve as a valuable source of income for homeowners through rent.

• Family Proximity and Aging in Place: These units allow extended families to live near one another while maintaining privacy. They also give homeowners the flexibility to share independent living areas with family members and others, facilitating older adults' ability to age in place.

• Housing Supply: ADUs are making a difference in the housing crisis. Between 2016 and 2023, the number of ADUs permitted annually in California grew 20-fold, from 1,336 to 26,924. In 2023, ADUs made up over 21% of all homes permitted statewide.

Key Regulatory Standards for ADUs

Understanding the rules governing ADU development is essential to a smooth permitting process.

Permitting and Timing

ADUs that are subject to State ADU Law must be reviewed, approved, or denied ministerially—meaning without discretionary review or a hearing. The review is based on objective standards that involve no personal or subjective judgment.

A permitting agency generally has 60 days to approve or deny a complete ADU or JADU application if an existing dwelling is on the lot. If the agency fails to act within 60 days of receiving a completed application, the permit is "deemed approved".

Owner-Occupancy and Rental Terms

A local agency cannot impose an owner-occupancy requirement on any ADU. However, local agencies can require that ADUs be used for rentals with terms longer than 30 days. For JADUs, the owner must reside in either the remaining portion of the primary residence or in the newly created JADU, with limited exceptions.

Size and Height Limitations

While local agencies may set maximum unit sizes by ordinance, they must allow an ADU of at least 850 square feet, or 1,000 square feet for ADUs with more than one bedroom. Also, conversion ADUs—created from existing space within a primary dwelling or accessory structure—are not subject to these unit size requirements.

A local agency may impose height limits, but they may not be less than:

• Detached ADUs: 16 feet on a lot with a proposed or existing single-family or multifamily dwelling unit. This increases to 18 feet if the lot is within a half-mile walking distance of a major transit stop or a high-quality transit corridor.

• Attached ADUs: 25 feet, or the height limitation that applies to the primary dwelling in the local zoning ordinance, whichever is lower.

Setbacks and Parking

For an attached or detached ADU, a setback of no more than four feet from the side and rear lot lines can be required. Importantly, no setback is required for an ADU or JADU created within an existing living area or accessory structure, or an ADU created in a new structure in the same location and to the same dimensions as an existing structure.

Local agencies are prohibited from imposing parking standards on ADUs in a number of specific circumstances, including ADUs located within a half-mile walking distance of public transit, or ADUs that are part of the proposed or existing primary residence or an accessory structure. In general, parking requirements cannot exceed one space per unit or bedroom, whichever is less. Furthermore, if a garage or carport is demolished or converted for an ADU, the local agency shall not require that those off-street parking spaces for the primary unit be replaced.

Overcoming Homeowners Association (HOA) Restrictions

Covenants, conditions, and restrictions (CC&Rs) and operating rules that effectively prohibit or unreasonably restrict the construction or use of an ADU or JADU on lots zoned for single-family residential uses are void and unenforceable under the Civil Code. HOAs may impose limited objective standards on an ADU or JADU, such as requiring specific materials or architectural styles, but these standards cannot unreasonably increase the cost to build or effectively prohibit construction. HOAs may not influence a local agency's ministerial approval of an ADU or JADU.

Unpermitted Structures Built Before 2020

A local agency is precluded from denying a permit for an unpermitted ADU or JADU constructed before January 1, 2020, because the unit violates building standards, State ADU Law, or a local ordinance. Denial is only permitted if correcting the violation is necessary to protect public health and safety, or if the building is deemed substandard. Homeowners applying for a permit for a previously unpermitted ADU or JADU constructed before January 1, 2020, may also be exempt from impact fees or connection/capacity charges if they provide written evidence that their household income does not exceed the definition of a low- or moderate-income household.

Start Your ADU Journey with Confidence

The process of building an ADU can seem complex, but by understanding the State's ADU laws and leveraging expert resources, California homeowners can successfully navigate the process. HCD provides resources and technical assistance on these matters through its online ADU Portal.

As you prepare to unlock your property’s potential, remember that having the right tools and information is key. We offer specialized resources to simplify the complex journey from concept to completion:

• California ADU Handbook: This free official handbook provides comprehensive guidance directly from the California Department of Housing and Community Development (HCD).

• ADU Ebook: Your Complete Guide to California ADUs: This comprehensive guide dives deeper into the regulatory details, design options, and local considerations to ensure you start your project fully informed.

• How To Finance an ADU Ebook: Navigate the financial landscape with our expert breakdown of loans, grants, and strategic financing options to make your ADU investment a reality.

• Pre-Approved ADU Plans for Sale: Save time and avoid costly revisions by starting with code-compliant, thoughtfully designed ADU plans engineered for California's unique requirements.

Empower your project with the clarity and expertise you need to build with confidence.

Detached ADU Cost & Comprehensive Build Guide: Everything You Need for Your Backyard Cottage

Introduction

A Detached Accessory Dwelling Unit (ADU or DADU for short), often called a backyard cottage, granny flat, or carriage house, is the ultimate way to maximize property value, generate passive income, and provide flexible living space.

Unlike attached units or garage conversions, a detached ADU is a standalone structure built from the ground up, offering superior privacy and design freedom. But what exactly does it take to build one, and what is the true cost?

This comprehensive guide breaks down the financial, regulatory, and logistical steps to successfully complete your detached ADU project, ensuring you turn your backyard into a powerful asset.

I. The Detached ADU Cost Breakdown: Why They Cost More Than Conversions

Detached ADUs typically command a higher initial price tag than some other common ADU types due to critical site work and utility connections. Understanding this upfront will help you budget effectively. But there are major benefits for choosing a detached ADU. Remember that price isn’t the only, and shouldn’t always be the most important, deciding factor for what type of ADU to pursue.

The current national cost range for a newly built detached ADU generally falls between $250 to $500+ per square foot, but your final number depends heavily on location, design complexity, and material finishes.

As an aside, I mention cost per square foot here, but I personally find that to be a terrible way to estimate the true cost of an ADU. Smaller ADUs have a much higher cost per square foot than larger ones as there is an economy of scale. Small ADUs still need all the expensive parts like kitchens, bathrooms, mechanical, electrical, and plumbing systems. A better estimated price range would be to assume most ADUs will fall in the $200,000 to $500,000 range depending on size, complexity of design, quality of materials, and site conditions. Size is only one aspect of determining the final price.

Unique Cost Drivers for Detached ADU Construction

To accurately budget your project, pay special attention to these expenses, which are unique to detached structures:

FURTHER READING: For a deep dive into financing your ADU, get our Ebook:
How to Finance Your ADU: A Guide to Loans, HELOCs & Creative Financing.

II. Detached ADU Design & Zoning Requirements

The single biggest differentiator between a successful ADU investment and a stalled project is your command of zoning requirements and their strategic application to design. It’s not simply about checking boxes; it’s about viewing local ordinances as the design DNA of your detached unit. A design firm that’s an expert in ADUs understands that setbacks, height restrictions, and lot coverage rules are not barriers—they are the constraints within which they engineer maximum value, and rentable space. By mastering these parameters early, the design team ensures the design is not just compliant, but is an elegant solution that anticipates permitting challenges, ultimately safeguarding your budget and timeline from the outset. It is also recommended that homeowners read their local zoning codes and ADU regulations so they know what is allowed and what to expect. This can help you pick the best design if you are going with a pre-designed ADU plan, or have better conversations with your custom design team.

Zoning: Setbacks, Lot Coverage, and Height Restrictions

1. Setbacks: Defining the Location
Setbacks determine how close your Detached ADU (D-ADU) can be built to the property lines. They are a critical factor because they dictate the location and also may impact the maximum width and length of your structure.

• State vs. Local Rules: While many state laws (like in California) mandate minimum setbacks as little as 4 feet from the side and rear property lines, local jurisdictions may impose stricter rules or looser ones. These local overlays often relate to fire safety, utility access, or neighborhood design review, and you must adhere to the strictest applicable rule.

• Strategic Placement: Understanding corner lot rules, front yard exceptions, and the necessity of fire access paths is essential for maximizing the usable space allowed by the setbacks.

2. Lot Coverage: Managing Site Density
Maximum lot coverage regulates the total percentage of your lot area that can be covered by all structures, including the primary home, garage, and the new D-ADU. This is a common bottleneck for properties with small yards or large main houses. Often local regulations will limit the footprint of structures rather than the full square footage of built area, so make sure you check your zoning code to see what is allowed or contact an experienced ADU designer in your area.

• Calculating Density: For example, if your lot is 5,000 square feet and the maximum coverage is 40%, only 2,000 square feet of structures are allowed. If your house already uses 1,800 square feet, your ADU is limited to a mere 200 square feet.

• The Exemption Angle: If your lot coverage is limiting what you can build, knowledgeable designers will look for local exemptions, such as rules that exclude features like permeable patios, trellises, or specific foundation types from the lot coverage calculation, allowing you to maximize the buildable footprint of the ADU itself.

3. Height Restrictions: Unlocking Multi-Story Design
Height limits are imposed to ensure the ADU remains subordinate in scale to the primary home and to mitigate concerns about shadowing or excessive bulk from neighbors. Most jurisdictions restrict D-ADU height, often between 16 and 25 feet.

• The Two-Story Challenge: This restriction is vital if you plan for a two-story design. If the local limit is 20 feet, an architect must strategically choose roof types (low-slope vs. peaked) and foundation methods (slab vs. raised) to gain enough vertical space for two full, code-compliant, and highly rentable floors. We have even been creative to get two story structures under the height limit but submerging the ground level of an ADU a few feed below the grade of a yard. These types of creative solutions are why hiring an experienced company like Modern ADU Plans can lead to the best option for your situation.

• Engineering Value: When height is constrained (e.g., 16 feet), the design must shift to a single story or a structure with attic-like space, proving that the D-ADU's design must be calibrated to the specific inch of the local height code to maximize your investment return.

Design Considerations for Modern D-ADUs

The detached nature allows for maximum design flexibility and architectural excellence for both the exterior look and feel and the interior layout and function. Focus on these elements when choosing your plans or discussing a custom design:

1. Privacy and Separation: Orient windows and outdoor spaces (like decks or patios) away from the primary residence and neighboring properties to maximize tenant comfort and value.

2. Making a Small Home Feel Larger: use views, access to narture, sliding doors, open layouts, and heigh ceilings to make the smaller spaces of an ADU feel larger.

3. Curb Appeal: The D-ADU should complement the main house but embrace a modern, efficient design. You don’t want it to look like a fake imitation of a historic style. The ADU design should reflect the time it was built. Focus on large windows, sustainable materials, smart siding, and clean rooflines. Look for design elements that can enhance the feel of the ADU through trellises, wood screens, planters, and other design elements that make the home feel welcoming.

4. Accessibility: Consider future use. Incorporating zero-step entryways and barrier-free bathroom layouts significantly increases the value and flexibility of the unit for aging-in-place. Whether you are building this now for an aging family member, or you plan to move into the ADU in the future when you are getting older, thinking about accessibility during the design can make your ADU ready for any future use. Plus it could demand higher rent, and be worth more as an investment.

III. Step-by-Step Construction: The Detached ADU Process

The process for building a Detached ADU (D-ADU) is structurally akin to building a small custom home, demanding the same professional rigor, design documents, engineering precision, and schedule discipline. Unlike minor renovations, a D-ADU rbegins with ground-up site work—a phase that is frequently underestimated. Mastering the sequence of these steps is essential, as permits, inspections, and contractor coordination depend on adherence to this order. Knowing the sequence not only helps you manage contractors and timelines but also empowers you to anticipate critical milestones like utility connections and final Certificate of Occupancy, transforming you from a passive homeowner into an informed project manager.

Phase 1: Pre-Construction & Site Preparation

• Demolition & Site Clearing: Clearing the area, removing existing sheds, and performing any necessary tree removal.

• Permitting: Final sign-off on construction documents.

• Excavation & Foundation: Digging utility trenches and pouring the foundation (a critical first step that must pass inspection).

Phase 2: Shell Construction (Framing and Weatherproofing)

• Framing: Erecting the walls, floor, and roof structure.

• Rough-Ins: Installing electrical wiring, plumbing pipes, and HVAC ductwork before the drywall goes up. This includes running the trenches to the main house.

• Exterior Finishes: Installing roofing, windows, exterior siding, and weather barriers to make the structure water-tight.

Phase 3: Interior Finishes & Final Inspection

• Insulation & Drywall: Completing the walls and ceiling.

• Interior Finishes: Installing flooring, cabinetry, interior doors, and plumbing/lighting fixtures.

• Landscaping & Connections: Final grading, connecting utilities, and completing any required fire access paths.

• Final Inspection: Receiving the Certificate of Occupancy (COO), which allows the unit to be legally rented or lived in.

GET STARTED: Ready to find your build partner? Read our guide: Your Guide to Hiring a General Contractor for Your ADU Project.

IV. The Best Detached ADU Plans for Any Backyard

Choosing a pre-designed plan dramatically cuts down on the design timeline and cost compared to a fully custom build. Our plans are specifically engineered to meet modern code requirements while maximizing living space.

Here are a few of our most popular detached ADU plans, perfect for various needs and lot sizes:

Sale

The Backyard Oasis ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

Sale

The Screen ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

Sale

The Overhang ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

Ready to Realize Your Backyard’s Potential?

Browse our full collection of architect-designed detached ADU plans and find the perfect fit for your property and investment goals.

5 Modern ADU Floor Plans That Work on Almost Any Property

If you're a homeowner looking to increase your property's value, create rental income, or provide a flexible living space, an ADU (Accessory Dwelling Unit) might be the smartest investment you can make.

In fact, recent research shows that adding an ADU can increase your property value by 20% to 30%. And depending on your location, renting one out could bring in $1,500 to $4,000 per month in rental income. That’s why more cities across the U.S. are updating zoning laws to encourage detached ADU development. These small homes are solving big problems: housing affordability, aging in place, and sustainable urban growth.

But the key to a successful ADU project? Choosing the right floor plan from the start.

In this guide, we're sharing five pre-designed, modern detached ADU layouts that are functional, affordable, and work well on a wide range of properties. Whether you're looking for a compact studio or a more spacious two-bedroom, these floor plans are optimized for how people live—and how cities approve construction.

Let’s dive in.

Sale

The Cabin

Sale Price: $1,499.00 Original Price: $1,799.00

Purchase

1. The Modern Studio ADU

A studio ADU is the perfect entry point. These small, efficient homes are typically between 400 and 500 square feet and combine all essential living functions, sleeping, cooking, and bathing, into one thoughtfully designed space. They are pretty affordable and simple to build.

🛠 Ideal size: ~350–500 sq ft
🏡 Best for: Rentals, guest suites, short-term stays, offices

Why this floor plan works:

• Small footprint = lower cost and faster permitting

• Can fit almost anywhere on your lot

• Low utility and maintenance costs

• Feels modern and spacious with open-concept design

These are especially popular in cities like Los Angeles, Seattle, and Portland, where lot sizes can be tight, and simplicity speeds up approval. They often have a good return on investment as they are the simplest, most cost-effective ADU to build, but you can still get decent rent in high-demand cities or neighborhoods.

Sale

The Backyard Oasis ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

2. The One-Bedroom ADU

The one-bedroom ADU strikes the perfect balance: it offers privacy and separation between the sleeping and living areas, while still remaining compact and affordable. They can demand a bit higher rent, but are still pretty simple and affordable to build. In fact, our most popular design - The Backyard Oasis ADU - is a one-bedroom that blends a simple plan with a modern look and feel. It is a great fit for almost any backyard and makes a perfect rental unit or short-term AirBnB rental.

🛠 Ideal size: ~500–700 sq ft
🏡 Best for: Long-term rentals, parents, adult kids, couples without kids

Why this floor plan works:

• Flexible layout options (L-shape, linear, or stacked)

• Large enough for full-time living, small enough to remain affordable

• Increases your property’s livable space without sacrificing your backyard

• Popular with renters looking for independent housing

These ADUs make a great case for permanent housing, particularly in neighborhoods where the cost of construction or living space is high.

Sale

The Screen ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

3. The Two-Bedroom ADU

Two-bedroom ADUs offer the most versatility. With more square footage, these units can comfortably house families, multigenerational households, or live-in caregivers. They can demand higher rent as they could house a family, or you could rent each bedroom separately or to roommates.

🛠 Ideal size: ~700–900+ sq ft
🏡 Best for: Families, aging parents with caregivers, higher-value rentals

Why this floor plan works:

• More privacy and separation between rooms

• Feels like a full standalone house

• Excellent for long-term use or home + office setups

• Maximizes ROI through flexible occupancy options

If you have the space and budget, a two-bedroom layout is a future-proof option, whether you use it yourself or rent it out. It gives the most flexibility and does a great job at balancing private bedrooms with enough space for very nice living and kitchen areas.

Sale

The Overhang ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

4. The ADU Over Garage

Want to add living space without sacrificing your yard? An ADU built over a garage is a smart way to go vertical, especially in urban areas where square footage is tight. There is often a tug of war between building an ADU and accommodating off-street parking. Although ADUs provide much more value than a parking space, many families want both. This is the perfect balance. You get an nice ADU while still maintaining parking or better yet, space for hobbies like a workshop.

🛠 Ideal size: Varies (~400–800 sq ft above a 1 or 2-car garage)
🏡 Best for: Urban homes, privacy-focused users, dual-purpose builds

Why this floor plan works:

• Efficient use of vertical space

• Offers elevated views and clear separation from the main house

• Combines storage/parking with livable space

• Perfect for adding value without expanding the building footprint

Over-garage ADUs are ideal for lots where yard space is limited but local code allows for vertical expansion. You get bonus storage below and usable living space above. Make sure you check your local ADU regulations to find out if you can build tall enough to comfortably accommodate a garage with an ADU above. One other thing to consider with these ADUs, is that they won’t be accessible. They are probably not a great fit for aging-in-place or housing people who have physical challenges climbing stairs. Which leads us to our last ADU type.

Sale

The Japandi ADU

Sale Price: $1,499.00 Original Price: $1,999.00

Purchase

5. The Accessible, Aging-in-Place ADU

Designed with mobility and long-term use in mind, accessible ADUs are increasingly in demand—not just for aging parents, but for anyone who values comfort, safety, and inclusive design. Because these work for people with all physical abilities, we often recommend starting with accessible, barrier-free ADU designs for everyone. It often doesn’t cost more and gives you flexibility. If I were building an ADU for myself, I’d design it to be barrier-free design.

🛠 Ideal size: ~500–800 sq ft
🏡 Best for: Elderly family, mobility-impaired users, future-proofing

Why this floor plan works:

• Single-level layout with no steps or thresholds

• Features like wide doorways, curbless showers, and open kitchens

• Can qualify for city incentives or fast-track permitting

• Keeps aging family members close while giving them independence

These ADUs provide peace of mind today, and flexibility for the future—whether for family needs or resale appeal.

The Right ADU Floor Plan Is Waiting For You

The demand for ADUs is growing rapidly across the US and Canada, and with good reason: they’re practical, sustainable, and offer real financial upside. But before you jump into permitting or construction, choosing the right floor plan will save you time, money, and headaches down the road.

Each of the five ADU floor plans above has been carefully designed to work with a wide range of properties, maximize usable space, and meet most local building codes. When you choose a pre-designed plan, you avoid the back-and-forth of custom architecture—and instead get a faster, more affordable path to building your dream ADU.

At Modern ADU Plans, we make it easy to find a design that fits your goals and your property.

ADU Zoning Rules for Columbia County, Oregon

Doing some research for a recently project had us looking up ADU regulations in Columbia County in Oregon. I’ve shared the actual code language below to make it easier for you to find the information you need. In general, this is one of the more restrictive ADU codes we have found . It sounds like the people who wrote this code either don’t want ADUs, or are listening to NIMBYs or others who are anti-ADU.

The actual zoning language:

224 Accessory Dwelling Units

1. One accessory dwelling unit is allowed in conjunction with a detached single-family dwelling on a lot zoned for single-family development within an Urban Growth Boundary (UGB) of a city. UGB areas have the following residential zoning districts: Single-Family Residential (R-10), Single-Family & Two-Family Residential (R-7), and Rural Residential (RR-5 and RR-2).

2. An ADU shall contain a kitchen, bathroom and a living/sleeping area that is completely independent of the primary dwelling. Recreational vehicles are not allowed as an accessory dwelling unit. Creation of a new Accessory Dwelling Unit may be accomplished through any of the following methods:

   1. A. Attached to the primary dwelling by converting a single-family dwelling’s existing living area, attic, basement or garage;

   2. B. Attached to the primary dwelling by adding floor area to the existing single-family dwelling;

   3. C. Constructing a detached accessory dwelling unit on the developed site including siting of a manufactured dwelling;

   4. D. Converting an accessory building, or portion thereof, to an accessory dwelling unit; or,

   5. E. Constructing a new dwelling with an internal accessory dwelling unit and, ~ 24 ~

   6. F. Constructing a new dwelling and converting the existing dwelling to a detached ADU, provided both dwellings meet the minimum zoning requirements.

3. The County will require the proposed Accessory Dwelling Unit to comply with the Gross Habitable Floor Area, and Owner Occupancy requirements as imposed by the City for the unincorporated portion of the City’s Urban Growth Boundary Area.

4. Domestic Water:
   Documentation shall be submitted to LDS that the ADU can be served by an existing public or community water district or by a private well that has been recorded with the State of Oregon Water Resources Department. LDS shall also require a Will Serve letter from the community/city water purveyor verifying the ADU can utilize the water system.

5. Sewage Disposal:
   The County Sanitarian shall review and approve the proposed method of onsite sewage disposal for the ADU for compliance with the applicable provisions in the Oregon Administrative Rules (OAR) 340-071-0205 for existing septic systems. If the ADU will utilize community sewer, documentation shall be submitted to the County that the affected city will provide sewer service.

6. Access:
   The road access to all ADUs shall be reviewed and approved by the County Public Works Department and the affected city for consistency with the applicable provisions of the County Road Standards Ordinance and the Urban Growth Area Management Agreements between the affected city and Columbia County.

7. Siting Requirements/Standards:
   The proposed ADU must comply with the underlying zone R-10, R-7, RR-5 and/or RR-2 Zones’ minimum yard setback requirements for primary dwellings. Height limitations and lot or parcel coverage requirements shall be the same as the underlying zone.

8. On Site Parking:
   The ADU shall provide one additional on-site parking space if the primary dwelling has less than three available on-site parking spaces (inclusive of garage and driveway).

9. Location of Entrances:
   For an attached ADU only one entrance to the residence may be located on the front of the dwelling facing the street, unless the primary dwelling contained additional door entrances before its conversion to an ADU. An exception is entrances that do not have access from the ground such as entrances from balconies or decks.

10. Exterior Design and Appearance:
    ADUs shall maintain consistency with the primary dwelling. For an ADU that is created by an adding floor area to the existing primary dwelling, the ADU shall have the same siding and roofing materials and exterior paint colors as the primary dwelling. For a detached ADU the County will require compliance with clear and objective design and appearance regulations adopted by the City where the UGB is located. ~ 25 ~

11. Divisions of Property:
    The division of a property containing an ADU shall comply with the minimum and applicable provisions of Zoning District and Subdivision and Partitioning Ordinance. Establishing a new ADU shall not allow the further division of RR-5 and RR-2 properties provided for in Sections 606 and 627 of the County’s Zoning Ordinance.

12. Alteration:
    If an existing authorized detached accessory structure, or portion thereof, is converted into an ADU, it is exempt from the minimum setback standards for primary dwellings. Any floor area that is added to this structure must not increase the setback non-conformity. Proposed expansions are not eligible to be approved with a Variance to the setback standards for single-family development.

13. Existing Non-conforming ADU:
    An existing, non-conforming second dwelling on a lot or parcel in any residential zone permitted by this section may be determined to be a conforming ADU through an approval process that includes the following:

    1. A. All necessary building permits and occupancy authorization is obtained to assure the ADU complies with the applicable fire, life & safety and building codes per the Oregon Residential Specialty Code and

    2. B. The ADU complies with other requirements of this section, such as size, floor area, water, sewerage, entry and access.

Commentary:

Their decision to impose style restrictions is terrible policy. In fact, I believe style restrictions should be illegal. It has nothing to do with protecting the health, safety, or welfare of the public and has no place in codes.

Further, the requirement to create an additional parking space is another sign that they don’t actually want to make building ADUs easy. In fact, this is an overreach by dictating how you can use your private property. Parking requirements make housing more expensive, directly lead to more traffic congestion, and have nothing to do with the health, safety, or wellfare of the public. Again, these types of regulations should be outlawed on the national level.

The only positive thing I can say about these ADU regulations is they at least allow ADUs. Other than that, this is an example of how to write a terrible ADU code that makes them harder to build and more expensive.

Maximize the ROI On Your Property With Our Free ADU Investment Proforma Worksheet

If you are considering investing in an Accessory Dwelling Unit (ADU) to maximize the value of your property or generate rental income, you have found the right place. Homeowners like you are an integral part of addressing our housing issues, while ADUs can also be a huge part of building generational wealth. Modern ADU Plans has developed free resources to help you make informed decisions about your ADU project. Along with our ADU Budget Worksheet, we highly recommend downloading our comprehensive ADU Investment Proforma Worksheet.

But First, Why Choose To Build An ADU?

ADUs are on the rise across the US and Canada for good reason. Accessory Dwelling Units help homeowners increase their property value, generate rental income, or provide a space for family members and guests. Many of our cleints even build an ADU for themselves to move into so they can rent out the larger main house. This is especially popular if their kids have grown up and moved off to college.

Not only are ADUs great for homeowners like you, they are also great for our communities. Towns and Cities across the country are facing housing shortages as we have underbuilt housing for decades now. We see this issue manifest in the homeless crisis we see and hear about on the news and in our towns. ADUs can be a great way to add new housing options in an affordable way without leading to sprawl. They are a sustainable way to increase housing supply within our communities.

These versatile structures are cost-effective, environmentally friendly, and can significantly boost the overall value of your property while improving your neighborhood.

Make Informed ADU Investment Decisions

Like investing in other real estate assets, building an ADU requires careful planning and consideration of various factors such as construction costs, potential rental income, financing options, and return on investment. Our free ADU Investment Proforma Worksheet is designed by experts in the field to help you analyze these crucial aspects and make sound financial decisions.

Although small in size, building an ADU is still a significant investment. It takes hundreds of thousands of dollars to build a quality ADU and we want you to spend your money wisely. Specifically, we want you to have a positive return on this investment. You should see cashflow on a monthly basis through rental income as well as an increase in your property value if you ever decide to sell the property in the future. This is why we advise our clients to work through a project proforma and develop a comprehensive project budget at the outset of an ADU project.

The Power of Data-driven Planning For Your ADU

Our worksheet provides a clear layout for inputting your project specifics, including construction costs, estimated rental income, financing terms, and ongoing expenses. By utilizing this powerful tool, you can project your potential cash flow, calculate your return on investment, and assess the financial viability of your ADU project.

What you need to do is some basic research on your local market. Input the going rates for similar sized rental units in your area, research local construction costs, and contact your bank for information on financing options. We can also assit you with answering these questions and filling out the proforma if you need help.

How to Get Your Free ADU Investment Proforma Worksheet

To access this valuable resource and kickstart your ADU investment journey, simply download our free ADU Investment Proforma Worksheet using the short form to the right. Empower yourself with the knowledge and tools needed to make informed decisions and maximize the potential of your property by planning for your new Accessory Dwelling Unit.

Don't miss out on this opportunity to take control of your financial future with an ADU investment. Download our free worksheet today and embark on your path to property enhancement and financial success!

Disclaimer: The information provided in the ADU Investment Proforma Worksheet is for general informational purposes only and should not be considered financial advice or legal advice. Please consult with a qualified professional for personalized guidance tailored to your specific situation.

Invest wisely, invest in ADUs with Modern ADU Plans.

Your ADU Proforma worksheet is complete and you are ready for the next steps?

There are a few ways you can move your project forward after you work through the proforma and make the decision to proceed with building an ADU.

You can hire a designer to help develop a custom designed ADU, purchase a pre-designed ADU plan, or talk to an ADU expert to discuss your ideas and develop a plan. Modern ADU Plans offers all of these options to help homeowners like you achieve your ADU goals.

There are three convenient buttons to the right, each offering you a way to take the next step towards your ADU.

Maximizing Your ADU Budget: Download Our Free ADU Budget Worksheet Today

If you are considering building an Accessory Dwelling Unit (ADU) but feeling overwhelmed by the costs involved, we sympathize. ADUs are significant investments even though they are small houses. There is also a lot of misleading information out there on ADU Facebook Groups, ADU blogs, and other sources. Budgeting for an ADU project can be a daunting task, and can get complicated, which is why we have created a comprehensive ADU Budget Worksheet to help you plan effectively and maximize your budget.

Why You Need an ADU Budget Worksheet

Your ADU project's budget is crucial to ensure that you stay on track and avoid financial surprises along the way. Planning early and accurately can help you save costs and avoid mistakes on your ADU build. Our ADU Budget Worksheet is designed to assist you in estimating costs accurately, identifying potential expenses, and helping you make informed decisions throughout the construction process. It is a guide that you can use early on in the planning process, but also set up to help you track the actual costs and compare them against your budget throughout the ADU design and construction process.

What Does Our ADU Budget Worksheet Offer?

Our free ADU Budget Worksheet includes detailed sections for all aspects of your ADU project budget, such as:

• Construction Costs: Estimate expenses for materials, labor, permits, and more.

• Design and Planning Fees: Include costs for architectural plans, engineering, and other design-related expenses.

• Utility Connections: Budget for water, electricity, and gas connections.

• Interior Finishes: Plan for flooring, fixtures, appliances, and other interior design elements.

• Exterior Finishes: Estimate costs for siding, roofing, landscaping, and other exterior finishes.

• Contingency Fund: Allocate a percentage of your budget for unforeseen expenses.

How to Download Our Free ADU Budget Worksheet

Getting your hands on our ADU Budget Worksheet is easy! Simply click the download link to the right to access this essential tool for your ADU project. Take the first step towards a well-planned and budget-friendly ADU construction process today.

Don't let financial concerns hold you back from realizing your ADU dream. Download our free ADU Budget Worksheet now and pave the way for a successful and cost-effective ADU project. Download now and start building your dream ADU with confidence!

Remember, proper budgeting is the key to a stress-free ADU construction experience. Let our ADU Budget Worksheet be your guide as you embark on this exciting journey.

Your ADU budget worksheet is filled out and you are ready for the next steps?

There are a few ways you can move your project forward after you work through the budget. You can hire a designer to help develop a custom designed ADU, purchase a pre-designed ADU plan, or talk to an ADU expert to discuss your ideas and develop a plan. Luckily Modern ADU Plans offers all of these options to help homeowners like you achieve your ADU goals.

There are three convenient buttons on the right side of this blog, each one offering you a way to take the next step towards your ADU.

---

Next Steps for your ADU Project:

Your Guide to Hiring a General Contractor for Your ADU Project

Building an Accessory Dwelling Unit (ADU) can be an exciting way to add living space, generate rental income, or create a home for aging family members. But navigating the construction process can feel daunting, especially when it comes to finding the right general contractor (GC). This crucial decision will significantly impact your project's success, so careful consideration is essential.

This guide equips you, the homeowner, with the knowledge and steps to confidently find a general contractor who aligns with your vision, budget, and timeline for your ADU project.

Pre-Contractor Prep: Setting Yourself Up for Success

Before diving headfirst into contractor searches, some groundwork on your end will streamline the process and empower you to ask informed questions during interviews.

• Solidify Your ADU Vision: Do you already have a design complete or have a specific design idea in mind? Typically a GC will want to see a rough design to be able to respond to. Think about the form of the ADU, its size, functionality (studio, one-bedroom, etc.), and any special features you desire. These all will affect the cost to build and the complexity of the construction process. Having a basic layout complete or browsing online inspiration boards like Pinterest or Houzz can be helpful. Or rely on drawings and images from your designer to set the direction.

• Know Your Local Regulations: Building codes and permitting processes vary by municipality. Research your local ADU regulations to understand feasibility and potential limitations. This knowledge will equip you to discuss the project's regulatory framework with potential contractors. Again, it is probably best to have a designer on board as you do this prep work prior to beginning your search for the ideal builder.

• Establish a Realistic Budget: Research average ADU construction costs in your area. Consider not just the build itself, but also architectural plans, permitting fees, and potential utility upgrades. A realistic budget will guide your contractor selection and keep your project on track financially. It is also best to not just use cost per square foot calculations that you find on the internet. They are rarely accurate and very misleading. Instead ask around and find total project costs for similar projects. Walk around your neighborhood and find properties that have ADUs and ask their owners what the total project cost was. This will be the best way to get some accurate information. Your design team should also be a great resource to share information on construction costs of similar project.

Finding Your Contractor: Where to Look and How to Narrow Down Options

• Talk to Your Designer: chance are you hired a design team because they have some experience on similar projects. Leverage that experience by asking them to recommend contractors they have worked with in the past that have successfully completed projects on time and on budget. The design team will probably have a handful of go-to contractors they like working with and would recommend for your project.

• Leverage Your Network: Talk to friends, family, and neighbors who have built ADUs. Personal recommendations are a goldmine, offering valuable insights into contractor performance and potential red flags. Ask them about the outcomes, the communication style, what happened when there were bumps in the road. This sort of insight will be a great way to assess if a contractor is worth interviewing for your ADU project.

• Online Directories and Review Platforms: Websites like Houzz, the National Association of Home Builders (NAHB), and the Better Business Bureau (BBB) allow you to search for licensed contractors in your area and view customer reviews. There are probably local directories in your area as well. Read reviews, peruse company portfolios and select the companies that have worked on similar projects and share your values.

• Specialty ADU Contractors: Consider companies specializing in ADU construction. Their experience with ADU-specific regulations and construction techniques can be invaluable and help avoid costly mistakes.

Qualifying Potential Contractors: The Interview Process

Once you have a shortlist of potential contractors, it's time for background research and in-depth interviews. Here's how to effectively assess each candidate:

• Licensing and Insurance: Verify the contractor holds a valid license in your state and has adequate general liability and worker's compensation insurance. Ask for copies of these documents. Check with the National Association of Home Builders (NAHB), and the Better Business Bureau (BBB) to verify the information and see if there are any complaints or legal issues with the company.

• Experience with ADUs: While general construction experience is valuable, prioritize contractors with a proven track record of successful ADU projects. Ask to see examples of their past work, ideally in your area and with similar ADU styles.

• Communication Style: A comfortable working relationship is key. You will be working with this team for many months in a stressful environment. Assess the contractor's communication style during the interview. Are they responsive, clear, and patient with your questions? Ask to speak with the project manager or any team member that will be leading the project if it won’t be the business owner or person you interview during the selection process.

• Project Timeline and Budget: Discuss your ADU vision, budget, and desired timeline with each contractor. Get detailed quotes outlining the scope of work, materials, and projected costs. There will be more about how to compare bids below. Be wary of quotes significantly lower than the average – they could indicate cutting corners or missing items that will be added later.

• References: Request a list of references from previous clients. Contact these individuals to get firsthand accounts of the contractor's work ethic, communication, and problem-solving skills. Ideally these references are people who built similar types of projects.

Beyond the Interview: Additional Considerations

• The Contract: Before signing any agreements, have a lawyer review the contract. The contract should clearly outline the project scope, timeline, budget, payment schedule, and change order procedures. Don't hesitate to ask questions and ensure you are comfortable with all the terms before signing.

• Permits and Inspections: Inquire about the contractor's experience navigating the ADU permitting process in your area. Although your design team may be leading this process, or perhaps you are taking it on to save costs, there will be times when the contractor may get involved. Working with a an experience team can help navigate the complexities of permit review and save time.

• Dispute Resolution: The contract should outline a clear process for resolving any potential disputes during construction.

Building Trust and a Strong Partnership

Finding the right general contractor is an investment in the success of your ADU project. By thoroughly vetting candidates and prioritizing clear communication, you can build a strong partnership with your GC and navigate the construction process with confidence.

Bids

When you ask GCs that you are interviewing for estimates or bids for the project, you will not be getting them in a standardized format. Each construction company handles bids differently. Your job as the homeowner is to review the bids when they come in and develop a process to interpret them so you can compare apples-to-apples. If you are unsure how to do this, ask your design team to help.

Often this means setting up your own spreadsheet or document and reorganizing the numbers you get from the builders so it is easier to compare across companies. The goal is to not just look at the total cost at the bottom of the bid, but to look at each line item to see if there are any outliers or red flags that need a more thorough review.

For example, if one company has the window package at $30,000 and another only shows it at $10,000 that is red flag. You will want to ask more questions of those companies to clarify how they calculated their numbers to make sure they didn’t make a mistake.

By understanding how a company calculated their costs you can build trust with that team. This also means that you don’t always want to go with the lowest bid. The lowest bid might mean they are missing items, didn’t take the full cost into consideration, and may have a lot of costly change orders throughout the project.

In fact, we rarely recommend hiring the cheapest builder.

Specific Questions to Ask As You Interview Builders:

How big is your team?
The size of the General Contractor’s company can shine a light on their resources, capacity, and organization. Often a larger company would have a dedicated project manager to lead your project, may be able to handle more complex projects, and may have in-house teams perform some of the work rather than subbing it out to other companies.

That doesn’t mean bigger companies are better for your project though. Small contractors offer some advantages as well. You might be working directly with the company owner, getting a more personalized service. Or they may be more affordable with less overhead expenses.

How many projects of a similar type and scale have you done recently?
You don’t want to hire a company that works on large multi-million dollar estates, or commercial buildings, to build a small ADU project. Their team won’t have the right experience. You want someone familiar with the type of project you are building so they can bring lessons learned from other projects to your build.

How many recently completed projects have come in on or under budget?
You want someone who has a track record of managing the construction budget. No one likes cost overruns or being surprised part way through the build with expensive change orders or requests for additional payments. Ask for case studies showing they can keep your project on budget. The answers to this question should reflect the companies ability to manage their team, the schedule, and the execution of the project.

How many recent projects have come in over budget?
You want to know if projects have come in over budget and then ask why. There are many reasons a project may go over, and it isn’t always the contractor’s fault. Maybe a client changed something, or material costs went up unexpectedly, or something was discovered during excavation that affected the project. The point is you want to learn why budget overruns happened and how the builder handled these situations.

Who will be the day-to-day contact?
Often there will be a project manager or site superintendent that will be your day to day contact on site throughout the project. You need to know who this person will be and make sure you can build a strong report with this individual. Their communication process will be key to the success of the project. They will also be in charge of managing all the various aspects of your project and the quality of their management skills is vitally important.

Bonus Tip:

Throughout the construction process, maintain open communication with your contractor and the design team. Schedule regular meetings - often called OAC (Owner, Architect, Contractor) meetings - to discuss progress, address any concerns promptly, and ensure the project aligns with your vision. And remember, it is always cheaper to make changes or work through problems on paper rather than in the field when things are getting built. Don’t cheap out by not engaging your design team to assist during the construction phase. They can save thousands of dollars and lots of time by helping answer questions, clarifying details, and troubleshooting the inevitable challenges along the way.

---

Next Steps for Your ADU

As discussed above, it is best to have a design in place as you begin your search to a builder to construct your ADU project. This is why starting with one of our pre-designed ADU plans can help you kickstart your project and save significant time. Take a look at our collection of modern ADU designs and find the layout that best suits your project goals and property.

Video: 5 Things to know before building your ADU

Southern Californians are racing to build accessory dwelling units — or ADUs — small, fully equipped homes on the same lot as a larger house. But building an ADU can be complicated and expensive. This video discusses 5 things you should know as you embark on building an ADU on your property.

Read the full story from the LA Times: You Do ADU, Part 1: Thousands of Californians are building ADUs. Should you?

California ADU Regulations - 2024

Navigating the regulations that affect new ADU projects can be daunting. Each state, county, city or town has their own rules and regulations that affect these projects. However, some states are passing state-wide rules to aim to unify some of the restrictions and make ADU development easier. California is one of the states leading this charge as they aim to promote ADUs as an important part of addressing housing affordability challenges.

With the goal of making ADUs easier to build, California has been passing some great laws that have drastically changed the ADU rules. There are some big changes even from last year. In the article below we will discuss some of the updated rules. But first, let’s start with the basics.

What is an ADU?

ADU is an acronym for Accessory Dwelling Unit. Often called other names like casita, laneway suite, garden suite, granny flat, or even guest house, ADUs are secondary homes built on a property, which are accessory to the primary structure. Unlike tiny houses on wheels, ADUs are full houses and include permanent foundations, separate entrances from the main house, fully functional kitchens, full bathroom, space for sleeping (either a bedroom or space for a bed if the unit is a studio), plus full utilities (water, sewer, and electricity).

ADUs are typically built as rental units, houses for extended families, or homes for downsizing and aging-in-place. In many places they can also be used as short-term rentals like for AirBnB or VRBO, although some towns and cities prohibit this use as they want ADUs to be used as permanent housing.

California Regulation Changes for 2024

Where there once was a tapestry of different rules and regulations across the state, California has been working on passing ADU laws that are applied statewide. Government officials have seen the challenges of having so many different rules and restrictions, thus they have been working to pass laws that override local restrictions that were used to prohibit or significantly hinder the ability for some homeowners to add ADUs to their properties. Because ADUs provide a lot of benefits to both individual property owners as well as society at large, passing statewide regulations that are easy to meet is helping people build enough ADUs to significantly increase the housing supply across the state.

Owner Occupancy on the Property

Owners are no longer required to live on the property if they want to build an ADU and rent it out according to AB 976. Property owners can now build ADUs and rent out both the main house and the new ADU. California has removed this requirement statewide, meaning no local jurisdiction can make this a requirement. This is a win for those looking to add ADUs to properties they currently own but are renting out. We believe ADUs are great investment opportunities and this doubles down on that belief.

ADUs can be sold separately as Condos

We absolutely love this change and think it is a true game changer for ADUs. It is something we hope spreads nation-wide as a way to make more affordable starter homes available for purchase.

Basically, it is now possible to build a new ADU on a property, and then condoize all of the homes on the property to be able to sell them separately. Meaning, you can now develop ADUs as a for-sale product rather than just as a rental unit. This is great if you want to build an ADU as an investment but want to get your money out of the project relatively quickly.

In markets where housing prices are quite high, you could see situations where you may build an ADU for say $300,000, condoize the property, and then sell off the ADU for say $450,000. In just a year or two you could see a 50% return on your investment. Plus you are creating a home that can be purchased for a very reasonable cost compared to many homes on the market.

ADU Types that are now allowed in California

All residential properties are eligible to add an ADU. And depending on the size of the property you could build up to 3 ADUs on your property - one Junior ADU (JADU), one attached ADU, and one Detached ADU (DADU). You can also convert existing structures like garages into ADUs.

ADU Size regulations

There are different maximum size limitations based on the property and layout of the ADU. In all cases you should be able to build an ADU up to 800sf. Individual jurisdictions can’t limit ADUs to below that size but can pass local laws increasing the maximum size an ADU can be. The state has passed laws that if no maximum size is defined then the maximum size is automatically set at 1,200sf for detached ADUs. If you are doing an attached ADU you can build up to 50% of the floor area of the main house or 800sf, whichever is larger.

Furthermore, if you are converting an existing structure you don’t have to abide by ADU size limitations as long as you aren’t expanding the size of the structure. If you stay within the existing footprint you can have an ADU of any side. This is great news if you are converting a large garage, basement, or other existing space into an ADU

Property Setbacks for ADUs

Most properties have setback requirements for buildings that prevent you from building right up to the property lines. I am very much against property setbacks as they prevent us from building some of the best housing types, like attached row houses. Side setbacks especially should be illegal nation-wide. But that is a battle for another day.

For ADUs in California side and rear setbacks are set at 4’ unless a local jurisdiction passes a law reducing that. Places like San Diego have stated that there is a 0ft side and rear setback for ADUs!

The front setbacks are a bit more flexible and can still be set by each jurisdiction as long as it doesn’t hinder the property owner’s ability to build an ADU up to 800sf.

ADU Height Limits

Height limits get a bit more complicated as it depends on location of the property, existing structures, and the type of ADU. The following rules apply:

• 16 ft height limit is the minimum for every ADU in California under any circumstance. Local jurisdictions can’t enforce a lower height limit. This most likely leads to a single story ADU although we have found some creative workarounds to get two-story ADUs within a 16’ height limit. Curious? Contact us for more information.

• 18 ft heights are allowed if an ADU is within 1/2 mile walking distance from public transit or if the property already has a two story tall multi-family dwelling. 18’ tall ADUs can definitely be a two story structure.

• 25 ft height limits are imposed if the ADU is going to be attached to the main residence. Even if the main house is taller, the ADU can only be 25’ tall.

Parking Requirements for ADUs

This is another area where we disagree with many of the regulations. Under no circumstances should parking be required on any property. It should be up to the property owner to decide if they want to build parking. Parking minimums are the dumbest laws and directly lead to more expensive housing and terrible environmental impacts. Parking requirements should be abolished nation-wide.

Alas, here are the rules:

• Off-street parking is required for ADUs in most circumstances.

• Exceptions:

  • If an ADU is within 1/2 mile walking distance from public transit

  • If the ADU is within a historical district

  • If the ADU is a conversion of existing space (like a basement or garage)

  • If the ADU is located within one block of a car-share vehicle

  • On street parking permits are required in your neighborhood but aren’t offered to the occupant of the ADU

• If you are converting a garage into an ADU, you are not required to replace the lost parking space.

CalHFA ADU Grant Availability

The CalHFA ADU Grant provided up to $40,000 towards the soft costs of building an ADU (soft costs are things like design, permitting fees, etc.). It was so popular that the latest allotment of $25 million committed to the program was claimed in just a few days. Thus no more funds are available as of the start of 2024.

Considering the popularity of the program and the continued need for new housing there is a good chance that it will be refunded in the near future.

Fire Sprinkler Requirements for ADUs

Fire sprinklers aren’t required except in a few circumstances. If they are required in the main house then they are also required in the ADU. Also, if the ADU is built far enough away from road or driveway access a sprinkler system may be required. This is due to access to the structure by the fire department and access for their trucks combined with length of fire hoses. If your ADU will be located more than say 150’ away from the street you may need to install sprinklers. Contact your local building department to verify the specifics of your project.

ADUs are now allowed on multi-family properties

All multi-family properties are now eligible to have ADUs. In fact, you can add at least one ADU by converting existing space in the building and you can add up to two additional detached ADUs. It gets even better. If the multi-family building has more than 8 units, you can add up to 25% of the number of units in the existing building. Example: if you have a 12 unit apartment building you can add up to 3 ADus (25% of the existing units).

Solar Panel Requirements for ADUs

When building a detached ADU it is required that you have solar panels on either the ADU or the main house. However, there are some exceptions for prefab ADUs or Modular ADUs. There aren’t solar requirements for basement ADUs, or JADUs.

---

Ready to start your ADU Project?

At Modern ADU Plans are here to help you achieve your goals and have a successful ADU project. Head over to our ADU store to find a beautiful ADU that meets your needs, or contact us if you are considering a custom designed ADU solution. We also offer some free resources on this website and consultations if you want to meet with an ADU design expert to ask questions.

Case Study: the Garcia Family and Their Backyard ADU Investment

The Garcia family, located in sunny California, faced a common challenge as their family grew: the need for more space. With adult children struggling to afford the cost of purchasing a new home close to their parents, they decided to explore the idea of adding an Accessory Dwelling Unit (ADU) to their property for multi-generational living. The idea was for the parents to move into the ADU designed for barrier-free living and aging-in-place, while the younger family members moved into the main house. Little did they know, this decision would result in a great return on their investment and much more.

The Decision to Invest in an ADU

After careful consideration and research, the Garcia family made the decision to move forward with building an ADU in their backyard. They saw it as an opportunity to create additional living space for their family, and also as a potential source of rental income in the future. The flexibility and potential for a high return on investment made the idea even more attractive.

What pushed them in this direction was the incredibly high cost of purchasing a single family home in California. The cost of building a new construction detached backyard ADU was approximately half the cost of buying a new home which made this decision a no brainer for their family.

Construction and Design

The Garcia family wanted a high quality design but also were hoping to minimize the cost of the design process as well as cut down on the time a custom design would take. After researching a variety of options including hiring an architect for a custom designed ADU, purchasing a prefab ADU, or going with a pre-designed ADU plan set, they decided that starting with the pre-designed plans but then customizing their preferred plan to fit their needs was the best approach - balancing cost and quality.

They worked closely with our team of ADU professionals to adapt one of the modern ADU plans for sale. The accessory dwelling unit was designed to be a comfortable, fully functional living space complete with a kitchen, bathroom, and large bedroom that offered great views to the backyard garden.

The thoughtful ADU design was focused on barrier free living and aging-in-place perfect for their parents to move into and age gracefully.

Although it was designed for elderly residents, the high-quality design will enable the ADU to be a desirable living space for potential renters in the future. This gives the new backyard ADU the flexibility for immediate needs and long term financial return on the investment.

Return on Investment

After the completion of the ADU, the Garcia family enjoyed the immediate benefits of the additional space. Their adult child who moved into the main house, was able to afford their own home for their growing family while still being close to their parents. They also had the added benefit of child care close by. The ADU saved thousands of dollars each month compared to the rental prices in their area. It also will be a lot cheaper than having their parents move into a retirement or assisted living home in the future.

They also have a ready made rental unit in the future that they estimate would bring in between $2,000 and $3,000 dollars per month in rent if/when they decide to put it on the market. This will give the young family additional income and provide financial flexibility.

Added Property Value

The backyard ADU not only provided financial benefits but also added value to the Garcia family’s property. The increased square footage, modern design, and the versatility of having an additional living space on the property boosted the overall value of their home. Should they decide to sell in the future, the presence of the ADU could potentially attract more potential buyers and increase the resale value of their property, potentially by hundreds of thousands of dollars. Taking the tight residential real estate market in California into consideration, and they anticipate the value to continue to rise significantly over time.

Conclusion

The Garcia family's decision to invest in building a backyard ADU proved to be a wise choice and one that thousands of families are deciding to make each year. From providing much-needed space for their growing family to generating a significant return on investment through rental income and added property value, their backyard ADU has been a great success. Their story serves as an example of how an ADU can be a wise investment, providing practical and financial benefits for homeowners. If you’re considering adding an ADU to your property, the Garcia family's experience is a testament to the potential rewards that come with this decision.

—-

Stay tuned for more inspiring stories and useful tips on modern ADU living at Modern ADU Plans.
Thank you for the opportunity to share this story and highlight the positive impact of adding an ADU to a property.

Accessory Dwelling Units: Case Studies & Best Practices from BC Communities

Accessory Dwelling Units: Case Studies & Best Practices from BC Communities

Welcome to Modern ADU Plans! We are thrilled to share this excellent resource created by the BC Housing Research Center, titled: "Accessory Dwelling Units: Case Studies & Best Practices from BC Communities."

This comprehensive PDF document dives into the best practices for ADUs in British Columbia, Canada. Whether you're a homeowner, a builder, a designer, or a policymaker, this resource is designed to provide valuable insights and inspiration for leveraging ADUs to meet housing needs, enhance property value, and promote sustainable community development.

From innovative design solutions to regulatory considerations, this research report highlights the diverse approaches and successes in integrating ADUs within BC communities. By sharing these examples, we aim to empower our readers with practical knowledge and ideas that can be applied to their own projects and initiatives.

We encourage you to download "Accessory Dwelling Units: Case Studies & Best Practices from BC Communities" and explore the wealth of information it offers. We believe that ADUs have the potential to make a meaningful impact on housing accessibility and urban development, and we are excited to share these valuable insights with you.

—-

Stay tuned for more updates, resources, and expert insights from Modern ADU Plans as we continue to explore the dynamic world of accessory dwelling units. Thank you for your interest, and we hope you find this document insightful and valuable.

Best regards,
The Modern ADU Plans Team

7 Steps to Finding the Perfect Builder For Your ADU Project

Embarking on an Accessory Dwelling Unit (ADU) project is an exciting endeavor for homeowners like you, unlocking increased living space, rental income potential, and even multigenerational living possibilities. However, finding the right builder can make all the difference between a smooth process and a stressful one. With numerous builders available, each offering their unique expertise and approach, it's essential to navigate the selection process thoughtfully. In this guide, we'll walk you through the steps to help you find the perfect builder for your ADU project.

Step 1: Get Your ADU Design

Before venturing into builder searches, take time to solidify your ADU vision and develop the design for the project. The more design information you can provide the builders, the more accurate their cost estimate can be, and they can better discuss how they would execute the project. Including your ADU architect or ADU designer in the selection process can also be a great strategy, as they can help ask important questions and give you advice on the best fit for your project.

You can also start by selecting a pre-designed ADU design so you are beginning your contractor search with the knowledge that the ADU has been built before and you already can have a rough idea of costs before starting conversations with builders.

Step 2: Define Your Project Needs and Goals

Before diving into the search for a builder, take the time to define your project needs and goals. Consider factors such as the size of the ADU, your budget, desired timeline, and any specific features or design preferences you have in mind. Having a clear understanding of what you want to achieve with your ADU will help you communicate effectively with potential builders and ensure they can meet your expectations.

Step 3: Research Builders in Your Area

Once you've defined your project needs, start researching builders in your area who specialize in ADU construction. Look for builders with experience and a proven track record of delivering high-quality ADUs that align with your vision. You can start by asking for recommendations from your designer, friends, family, or colleagues who have recently completed ADU projects. Additionally, explore online resources such as builder directories, review websites, and social media platforms to gather a list of potential candidates.

Ideally, you should develop a list of 5-10 companies in your area that you are potentially interested in working with. This “long list” will be the businesses you will research in more depth before reaching out to them.

Step 4: Review Portfolios and References

After compiling a list of potential builders, take the time to review their portfolios and gather references from past clients. Look for builders who have experience working on projects similar to yours and have a portfolio that showcases their craftsmanship and attention to detail. If they have projects that align with your aesthetic taste, that is a bonus. Reach out to past clients to inquire about their experience working with the builder, including communication, project management, and overall satisfaction with the finished ADU. It is good to ask about how they dealt with any challenges or hurdles that come up in the process. No project is smooth from start to finish so knowing how people deal with conflict resolution is key to having a great working relationship.

Step 5: Schedule Initial Consultations

Once you've narrowed down your list of potential builders to 2-4 ideal companies, schedule initial consultations to discuss your project in more detail. Use this opportunity to ask questions about the builder's experience, approach to ADU construction, project timeline, and pricing structure. Pay attention to how the builder communicates and whether they listen to your needs and preferences. Building a strong rapport with your builder is essential for a successful collaboration, so trust your instincts during the consultation process.

We typically recommend interviewing the builders and ideally meeting on site if they are available and willing. Also, having a series of questions that you ask all the builders you interview can help you compare their responses to find the best fit.

Step 6: Request Detailed Proposals

After meeting with potential builders, request detailed proposals outlining the scope of work, project timeline, materials and finishes, and pricing. Review each proposal carefully and compare them side by side to ensure they align with your project needs and budget. Pay attention to any discrepancies or areas where clarity is needed, and don't hesitate to ask questions or request revisions as needed. A transparent and detailed proposal will help you make an informed decision when selecting a builder for your ADU project.

This is another place that your design team can be a huge help. Architects and designers can help compare bids, clarify areas that may be confusing, answer your questions, and look for opportunities to potentially save costs. It is highly recommended that you engage your designers to benefit from their expert advice during this process.

Step 7: Check Licensing, Insurance, and Credentials

Before making a final decision, take the time to verify that your chosen builder holds the necessary licensing, insurance, and credentials to perform ADU construction in your area. Check with your state or local licensing board to ensure the builder is properly licensed and in good standing. Additionally, verify that the builder carries adequate liability insurance and workers' compensation coverage to protect you and your property throughout the construction process. Finally, consider any additional certifications or affiliations that may indicate the builder's commitment to quality and professionalism.

Conclusion

Finding the perfect builder for your ADU project requires careful research, thoughtful consideration, and clear communication. By following these seven steps, you can ensure you find a builder who can bring your ADU vision to life. Remember to trust your instincts, ask for advice from your design team, ask lots of questions, and prioritize transparency and professionalism throughout the process. With the right builder by your side, your ADU project will be off to a successful start.

Navigating ADU Financing: Tailored Options for Your Unique Scenario

When embarking on the journey of constructing an Accessory Dwelling Unit (ADU), choosing the right financing option is paramount. Rushed or poorly planned decisions could lead to financial repercussions and lower return on your investment. In this guide, we'll explore the best ADU financing options based on various scenarios, helping you align your financial strategy with your unique circumstances.

Your Financial Situation

Understanding your financial situation is crucial for making informed decisions about your future. By taking the time to assess your income, expenditures, savings, and investments, you can gain clarity on where you stand and chart a path toward your financial goals. Whether it's creating a budget, clearing debt, or planning for retirement, a comprehensive understanding of your financial landscape is the foundation for a stable and secure future.

Your Equity Position

Before delving into financing specifics, it's crucial to assess your equity position. Equity, the portion of your existing home that you own, is the linchpin for various financing avenues. High equity broadens your options, and calculating it involves subtracting your mortgage balance from your home's value.

Example: If your home is valued at $500,000 based on the local real estate market, and you have a remaining mortgage balance owed of $150,000, your equity is $350,000.

The advantage of having a lot of equity is you can potentially do a cash-out refi or a Home Equity Line Of Credit, also known as a HELOC, to help finance an ADU project.

Your Credit Score

A good credit score is your ticket to favorable financing terms. The higher your score, the less risk you pose to lenders, potentially resulting in lower interest rates. A credit score between 670-739 is considered "good," with higher scores being more attractive to lenders. If your credit score is too low banks or other lenders may not approve you for a loan, limiting your options to finance a project.

Your Income

Your income or salary influences your Debt-to-Income (DTI) ratio, a key factor for loan eligibility. Lower debt and higher income enhance your chances of qualifying for certain loans. It is also worth tracking some recent trends in terms of what banks - and especially the federal government - will take into consideration as income to help back a loan. Specifically, there is new regulations that allows the future revenue from renting an ADU to be counted as part of your potential income, resulting in more people qualifying for loans to build ADU projects. Ask about this when you talk with your bank or loan broker.

ADU Financing Options If You Have High Equity

Home Equity Line of Credit (HELOC)

We briefly touched on this earlier. For those with high equity in their property, a HELOC is a versatile option to fund adding an ADU. It leverages your home's value, providing a credit limit based on your equity. The more equity you have, the greater your potential funds. Typically HELOCs will allow you to leverage up to 80% of your home’s appraised value.

For Example: Using the situation we described above, with a home appraised at $500,000 and a $150,000 mortgage balance, 80% of your appraised value yields a total debt amount of $400,000. You already have $150,000 on your mortgage balance so you could take out a HELOC with a balance of $250,000 that can be used on your ADU project.

Cash-Out Refinance

In a cash-out refinance, homeowners can refinance for more than they owe, receiving the difference in cash. It's a way to convert home equity into funds to be used on other projects. Sometimes a bank could even calculate what the value of the property would be after the ADU is built, giving you more flexibility on how much you could take out.

The down sides of this approach is you are basically taking out a new mortgage, so you would be resetting to payment schedule for another 30-Term (assuming you do a standard 30-year fixed mortgage).

ADU Financing Options If You Have Low Equity

Construction Loans

For those with low equity, construction loans evaluate the property's future value post-ADU completion. It allows borrowing against the anticipated value increase.

Example: A home worth $500,000 without an ADU might appraise at $700,000 after the ADU is built, allowing a loan of up to 80% of the increased value - so a loan of $560,000.

The challenge here is that you will have to bridge the difference between the loan you can take out and the cost of building the ADU with additional funds - ideally cash.

Personal Loans

Personal loans, obtained from lenders, offer flexibility. They have fixed interest rates and repayment terms, with your credit score influencing the interest rate offered. There is no limitation on what Personal Loans can be used for.

However, be careful here. Personal loans often have higher interest rates the mortgages or HELOCs, and sometimes have variable interest rates which can be risky. And if you aren’t able to make regular payments it can negatively impact your credit score for many years.

We recommend only using personal loans on smaller amounts to maybe bridge between another loan product and the final cost of construction on your ADU. Ideally, you can avoid these altogether.

Rehabilitation Loans - FHA 203(k)

This FHA loan aids in purchasing a home while financing significant renovations. It's suitable for ADUs, offering a single monthly payment for both mortgage and renovation costs. Typically this would be used if you are planning on purchasing a new house and building an ADU on that new property at the same time.

ADU Financing Options If You Have A Good Credit Score

Traditional Bank Loans

Banks, offering low-interest loans, are a standard choice. However, stringent requirements, collateral, and a time-consuming application process are factors to consider. Interest rates are also currently high based on recent history so you may end up refinancing in the near future. There are fees associated with taking out a loan as well as refinancing, so calculate those as part of the analysis of the total loan costs and the return on investment of your ADU project.

Hard Money Loans, or Peer-to-Peer Lending

Cutting out financial institutions, peer-to-peer lending connects borrowers directly with investors. Your credit score will influence the interest rate you will receive. These sorts of loans tend to have much higher interest rates than banks or mortgages, and often the repayment period is much shorter. These are often used to get cash quickly to start construction with the goal of refinancing the project into a more traditional mortgage within a year or two and paying back the full Hard Money loan. It is not advised to carry these loans for a long period of time as the interest payments can cause financial hardship.

ADU Financing Options If You Have A Low Credit Score

Secured Loans

Secured loans, requiring collateral, are easier to qualify for and often have lower interest rates. However, defaulting may lead to the loss of the collateral asset. For example, you may use stock investments or some other asset as collateral but if you default on payments those assets would be lost.

Government Assistance Programs

Government programs, like homeownership vouchers, could assist in financing ADUs even with low credit scores. Check out the federal and state programs in your area to see if there are any that are applicable to your situation.

ADU Financing Options for Limited Income Scenarios

Grants and Subsidies

Grants and subsidies offer awarded money without repayment requirements, supporting various projects, including ADU construction. These are growing across the country as more and more governments are seeing ADUs as one part of the solution to housing affordability challenges. New York State just announced that they will cover the costs of ADUs as part of a trial period. California also has grant programs to help cover the up front soft-costs aspects of an ADU Budget, which are the design and permitting fees. These programs can give a huge boost to making your project affordable so definitely research what programs are available in your area and what the qualification requirements are.

Shared Equity Programs

Shared equity programs make homes more affordable, offering below-market prices or subsidies in exchange for future limitations on resale. I have seen some of these instigated in the Portland area but they aren’t as wide spread. They also may limit what you can do with your ADU in the future in terms of rental prices, who the renters are, and what you could get if you sell the property in the future. Make sure your read all the terms and conditions very carefully to know what you are getting into. Often it would be a better long-term investment to pay the full cost of an ADU rather than giving up future value.

---

In conclusion, taking the time to thoroughly comprehend your financial situation and actively seeking out personalized ADU financing solutions is crucial in setting the stage for a successful ADU project. By doing so, you can approach the endeavor with a sense of assurance, knowing that your financial strategy is specifically tailored to suit your individual circumstances. This strategic approach not only provides a solid foundation for your ADU construction but also alleviates unnecessary stress associated with financial concerns, allowing you to focus on the creative and practical aspects of bringing your ADU plans to life. Therefore, the proactive exploration and consideration of tailored ADU financing options are key to ensuring that your financial resources are efficiently aligned with the unique requirements of your ADU project.

Barrier Free ADU Design: Key Strategies

As the demand for Accessory Dwelling Units (ADUs) continues to rise, it's crucial to consider barrier-free design strategies that prioritize accessibility and inclusivity. Barrier-free design ensures that individuals of all ages and abilities can comfortably and safely navigate and utilize the space. Whether you're building an ADU for aging relatives, individuals with mobility challenges, for you to downsize as you get older, or simply to future-proof your property, incorporating inclusive design principles is a prudent and compassionate choice.

Key Design Considerations:

1. Entrance and Circulation

When designing a barrier-free ADU, it's essential to focus on creating smooth and unobstructed pathways. This includes wider doorways to accommodate wheelchairs and walkers, lever-style door handles for easy operation, and a step-less entry to eliminate potential tripping hazards. This includes considering the entire entry sequence from the sidewalk at the front of the property all the way back to the ADU location as well as access from any on-site parking area.

2. Open Floor Plans

Opting for an open floor plan facilitates seamless movement within the ADU. Spacious rooms and clear sightlines enhance accessibility, allowing for easy maneuvering and a sense of openness. We typically design open floor plans with large “great rooms” that combine the living, dining, and kitchen areas in our ADUs to make them as flexible as possible.

3. Kitchen and Bathroom Accessibility

In the kitchen, incorporating lower countertops (or even adjustable counters), pull-out shelves, and lever-handled faucets promotes independence for individuals with limited mobility. We have even selected touch free faucets in some of our designs to make them easier to use. Similarly, in the bathroom, roll-in showers, grab bars, and adjustable height features contribute to a more accessible and usable bathroom for all users regardless of any physical abilities or limitations.

4. Universal Design Elements for your ADU

Universal design principles, such as slip-resistant flooring, varied lighting options, lever style door handles, and strategically placed electrical outlets, can benefit occupants of all abilities. Prioritizing these elements ensures that the ADU remains practical and functional for everyone.

5. Outdoor Accessibility

Don't overlook the outdoor spaces. Accessible pathways, well-lit entrances, and outdoor gathering areas designed with inclusivity in mind contribute to an overall welcoming environment. This is especially important when you are designing thresholds for entry doors, sliding doors, and adjacent decks or patios. Consider details that allow for easy access for wheelchairs and other mobility devices.

6. Incorporating Technology

Embracing smart home technology can significantly enhance the accessibility of an ADU. From voice-activated controls for lighting and temperature adjustments to automated door openers, these innovations can greatly improve the quality of life for individuals with mobility challenges. Smart home technology is rapidly changing so work with your designer or builder to consider the latest options.

Legal and Regulatory Considerations

Before embarking on the construction of a barrier-free ADU, it's vital to familiarize oneself with local building codes and regulations related to accessibility standards. By ensuring compliance with relevant laws, you can guarantee that the ADU meets the necessary requirements for inclusivity. And some locations are giving incentives to encourage more accessible ADU projects so check with your local building department.

The Benefits of Barrier-Free ADU Design

By embracing barrier-free design strategies, you not only create a more welcoming living space for occupants with specific needs but also enhance the overall versatility and appeal of the ADU. Additionally, as the population continues to age, the demand for accessible living spaces is expected to grow, making barrier-free ADUs a wise investment for the future.

In conclusion, prioritizing barrier-free design strategies when planning and constructing an ADU is an investment in inclusivity, comfort, and long-term value. By embracing these principles, you can create a space that meets the diverse needs of its occupants and contributes to a more equitable and accessible living environment for all.

---

At Modern ADU Plans we aim to provide designs that can meet any needs wrapped in a beautiful modern look and feel. Many of our designs are barrier free already, and we can work with you to adapt the others to meet your needs. Please tell us about the design you are considering and let us know what your personal goals are for the project so we can discuss how we can make your favorite design suit your needs.

The accessible bathroom in our design for The Japandi ADU includes extra room in front of the sink and toilet to accommodate the turning radius of a wheelchair, a barrier free roll-in shower, a toilet paper holder that doubles as a grab bar, and a lower than normal sink.

Sustainable Living Redefined: The Rise of Environmental Friendly ADUs

In an era marked by a pressing need for sustainable living and conscientious design, the term "ADU" takes on a new dimension. Beyond being an accessory dwelling space, ADUs emerge as inherently sustainable structures that not only complement the existing home but also contribute significantly to a more eco-conscious way of living. In this exploration, we delve into the environmental advantages of ADUs, and discuss why homeowners should consider these structures not just as additions but as anchors for a sustainable future.

Defining Environmentally Friendly ADUs

At its essence, an Environmentally Friendly ADU is a blend of thoughtful design, energy efficiency, and a commitment to minimizing environmental impact. These accessory dwelling units are crafted to align with principles of sustainability, from the materials used in construction to their operational efficiency and integration with the natural environment.

1. Sustainable Materials Selection: Building the Future Responsibly

A crucial element that distinguishes Environmentally Friendly ADUs is the selection of sustainable materials. From foundation to finishings, conscientious choices in materials play a pivotal role in minimizing the environmental footprint of these structures. Reclaimed wood, recycled steel, and eco-friendly insulation materials contribute to a reduced demand for virgin resources, making each ADU a testament to responsible construction practices. We also encourage homeowners to look for locally sourced materials and products to reduce the impacts of shipping while supporting their local economy.

2. Energy Efficiency: A Pillar of Sustainable Design

Sustainable ADUs should be designed with energy efficiency at the forefront. This encompasses everything from the orientation of the structure to harness natural light and heat, to the installation of energy-efficient appliances and fixtures. Environmentally Friendly ADUs are often equipped with solar panels, rainwater harvesting systems, and energy-efficient HVAC systems, further reducing their reliance on external energy sources and minimizing their impact on the grid.

3. Smart Design for Natural Ventilation and Lighting

The design of Environmentally Friendly ADUs is a delicate dance with nature. Strategic placement of windows, skylights, and ventilation systems ensures that these structures are flooded with natural light and benefit from optimal cross-ventilation. This not only reduces the need for artificial lighting and mechanical cooling but also creates a living space that is seamlessly connected with the surrounding environment.

4. Green Roof and Sustainable Landscaping: Bringing Nature Closer

A hallmark of an Environmentally Friendly ADU is the integration of green roofs and sustainable landscaping. Green roofs not only enhance the aesthetic appeal of the structure but also contribute to improved insulation, stormwater management, and biodiversity. Coupled with native and drought-resistant landscaping, these ADUs can become not just buildings but extensions of the natural ecosystem, fostering a sense of harmony with the environment.

5. Water Efficiency: A Precious Resource Preserved

Water conservation is a non-negotiable aspect of sustainable living, and Environmentally Friendly ADUs should lead the way in water-efficient design. Low-flow fixtures, rainwater harvesting systems, and permeable surfaces for stormwater absorption collectively contribute to a significant reduction in water consumption. By incorporating these features, ADUs become models of responsible water use in residential construction.

Why Homeowners Should Embrace Environmentally Friendly ADUs

1. Reduced Environmental Impact: By choosing to build an Environmentally Friendly ADU, homeowners actively contribute to the reduction of their environmental footprint. The use of sustainable materials and energy-efficient systems ensures that the construction and operation of these structures are aligned with principles of ecological responsibility.

2. Long-Term Cost Savings: While the initial investment in Environmentally Friendly ADUs may be marginally higher, the long-term cost savings are substantial. Energy-efficient systems result in lower utility bills, and the use of durable, sustainable materials minimizes maintenance and replacement costs over time.

3. Increased Property Value: In a real estate market increasingly valuing sustainability, properties with Environmentally Friendly ADUs enjoy enhanced market appeal. Homebuyers recognize the long-term benefits of eco-friendly living spaces, translating into increased property value and a competitive edge in the real estate market.

4. Adaptability to Local Regulations: Many jurisdictions are revising building codes to encourage sustainable construction, and Environmentally Friendly ADUs align perfectly with these evolving regulations. Homeowners building ADUs find themselves in sync with the changing landscape of building requirements, positioning their properties as forward-thinking and compliant with emerging standards.

5. Contributing to Sustainable Communities: Building Environmentally Friendly ADUs goes beyond individual benefits; it contributes to the larger goal of creating sustainable communities. As these structures become more prevalent, they pave the way for a collective shift towards eco-conscious living, setting a standard for future residential developments.

In Conclusion: A Sustainable Tomorrow Begins at Home

In embracing the concept of Environmentally Friendly ADUs, homeowners embark on a journey toward sustainable living that transcends the boundaries of their properties. These structures become beacons of responsible design, illustrating that every decision, from material selection to energy systems, can be a conscious step toward a more sustainable future. As an ADU design expert, my invitation to homeowners is not just to consider ADUs as additional structures but as catalysts for change—change that echoes in the reduction of carbon footprints, the preservation of natural resources, and the creation of living spaces that resonate with the principles of environmental stewardship. Building an Environmentally Friendly ADU is not merely an investment in property; it's an investment in a future where homes and the environment coexist in perfect harmony.

What Does ADU Stand for (in housing, in real estate, in building)

In the dynamic landscape of housing and real estate, the acronym "ADU" has been gaining prominence, offering homeowners a unique avenue to enhance their property value, generate supplemental income, and contribute to the ever-evolving concept of sustainable urban living. ADU, or Accessory Dwelling Unit, is a term that carries profound implications for homeowners, architects, and urban planners alike. As an ADU design expert, it's my pleasure to shed light on what ADUs stand for in the realms of housing, real estate, and building, and why homeowners should consider embracing this transformative concept on their property.

What Does ADU Stand For?

At its core, ADU stands for "Accessory Dwelling Unit." This term encapsulates a versatile and innovative concept in housing design and urban planning. Accessory Dwelling Units are additional, self-contained living spaces that exist on the same property as the primary residence. These units can take various forms, including standalone structures (detached ADUs), garage conversions, or basement apartments (attached ADUs). The essence of ADUs lies in their ability to provide homeowners with an auxiliary living space that is functionally independent to the main dwelling but resides on the same property.

ADUs in Housing: A Revolution in Living Spaces

In the realm of housing, ADUs represent a departure from housing models that proliferated after WWII when suburbs led to the rise of single family homes. In some ways ADUs reintroduce more historically common housing types. They offer a pragmatic solution to the growing challenges of housing affordability, urban density, and shifting demographics. By allowing homeowners to leverage their existing property to create additional living quarters, ADUs provide an avenue for multigenerational living, rental income, a private space for aging parents or adult children, or even space for short term guests or work-from-home office space.

One of the defining features of ADUs is their flexibility. Whether a detached backyard cottage, a converted garage, or an added unit within the existing structure, ADUs adapt to the specific needs and constraints of the homeowner. This adaptability makes them a powerful tool for homeowners looking to maximize the utility of their property.

ADUs in Real Estate: Elevating Property Value and Market Appeal

From a real estate perspective, ADUs have emerged as an asset that significantly enhances a property's value and market appeal. In a landscape where housing shortages and rising property prices are prevalent, having an ADU on your property can be a game-changer. Real estate experts increasingly recognize the added value that an ADU brings to a property, making it a sought-after feature among homebuyers.

The additional income potential from renting out the ADU provides homeowners with a sustainable and ongoing return on their investment. Moreover, the ability to market a property with an ADU as a versatile and income-generating asset sets it apart in a competitive real estate market.

ADUs in Building: Embracing Sustainable and Smart Design

In the context of building, ADUs embody the principles of sustainable and smart design. As cities grapple with issues of urban sprawl and environmental impact, ADUs present a compelling alternative. By utilizing existing land and infrastructure, homeowners can minimize the environmental footprint of their living spaces.

ADUs also encourage thoughtful design that optimizes space, energy efficiency, and resource use. Whether constructing a new standalone unit or repurposing an existing structure, the building process for ADUs often involves innovative solutions that prioritize functionality, aesthetics, and environmental consciousness.

Why Homeowners Should Consider Building an ADU

Now that we've demystified the acronym, the question naturally arises: Why should homeowners consider building an ADU on their property? The answer lies in the multifaceted benefits that ADUs bring to the table.

1. Supplemental Income: ADUs offer homeowners the opportunity to generate supplemental income through rental arrangements - either short term like AirBnb or VRBO, or long term leases. This additional income stream can be a powerful financial tool, helping homeowners offset mortgage costs or fund other investments or just contribute to their cost of living.

2. Flexible Living Spaces: As families evolve and dynamics shift, the need for flexible living spaces becomes increasingly important. ADUs provide homeowners with adaptable spaces that can serve a variety of purposes, from housing extended family members to creating a home office or studio.

3. Property Value Enhancement: The addition of an ADU can significantly increase the overall value of a property. Real estate markets value properties with ADUs for their versatility, income potential, and the flexibility they offer to future owners. Properties with ADUs sell for significantly higher prices.

4. Urban Density and Sustainability: In urban areas, where available land is limited, ADUs offer a sustainable solution by maximizing the use of existing space. They contribute to more efficient land use, reduced urban sprawl, and a lower environmental impact compared to traditional housing models. In places like Vancouver, Chicago, or Toronto, ADUs or “laneway suites” are already popular ways to add new housing to historic neighborhoods. While cities like Los Angeles, Seattle, and Portland are seeing a huge increase in ADUs in backyards across their historically single family properties.

5. Multigenerational Living: The concept of multigenerational living is gaining traction, with families recognizing the benefits of shared spaces. ADUs provide an ideal solution for multigenerational households, offering a balance of independence and proximity. This is great for adult children who want a starter home, or for aging family members who would rather live close to family rather than move into a retirement community.

6. Future-Proofing Your Property: Embracing the concept of ADUs positions homeowners at the forefront of a housing trend that is gaining momentum. As cities explore innovative solutions to housing challenges, properties with ADUs become increasingly valuable and desirable. It allows you to change how you use your property over time. You may want rental income now, more space for a growing family in a few years, and a home for an aging family in a decade from now. ADUs give you all of these options as your family’s needs shift over time.

7. Regulatory Support: Recognizing the potential of ADUs, many jurisdictions are revising zoning and building regulations to facilitate their construction. Homeowners building ADUs benefit from a supportive regulatory environment that encourages the integration of these units into residential properties.

In conclusion, understanding what ADU stands for is not merely an exercise in terminology but an exploration of a transformative concept that has the potential to reshape the way we live, build, and invest in real estate. For homeowners seeking a strategic and forward-thinking approach to property ownership, the addition of an ADU is more than an acronym; it's an investment in a dynamic and sustainable future. As an ADU design expert, I encourage homeowners to explore the possibilities that ADUs present, recognizing them not just as additional structures but as key contributors to a more resilient, versatile, and valuable living space.

This is the design that started it all for us. Our first ADU project, designed to be a short term rental unit on Airbnb. Located in NE Portland it has been a fantastic investment for the homeowner and a project we are proud to say launched our interest in this housing type.

FHA's Game-Changing Move: ADUs Now Help With Mortgage Financing

In a groundbreaking move that is set to transform the landscape of housing affordability, the U.S. Department of Housing and Urban Development (HUD), through the Federal Housing Administration (FHA), has unveiled a new policy that promises to open doors for homeowners and those aspiring to own a home. This new policy allows lenders to consider income from Accessory Dwelling Units (ADUs) when underwriting a mortgage, thereby expanding financing options for borrowers. It's a pivotal shift that will have far-reaching implications, positively impacting housing supply, generational wealth building, and access to homeownership, in line with the Biden-Harris Administration's goals.

Unlocking New Opportunities: The Role of ADUs

Under the new FHA policy, income generated from ADUs, whether they are housed inside, attached to, or situated on the same property as the primary residence, can be included in the borrower's qualifying income. This means that more borrowers can now qualify for FHA financing, including the 203(k) Rehabilitation mortgages, when the property in question includes ADUs. These auxiliary living units, which can be rented to tenants, contribute to the housing supply in communities, and this policy encourages their integration into homeownership strategies.

A Win-Win Scenario: ADUs and Generational Wealth

This innovative policy is set to benefit a wide spectrum of potential homeowners, including first-time buyers, seniors, and intergenerational families. By embracing the power of ADUs, these individuals can enhance their generational wealth-building potential through homeownership. It's a win-win scenario that aligns perfectly with the Biden-Harris Administration's Housing Supply Action Plan, emphasizing the importance of addressing affordable housing challenges and increasing access to homeownership.

Impactful Policy Highlights

The new FHA policy brings several key provisions:

1. ADU Rental Income Inclusion: It allows for 75% of the estimated ADU rental income to be considered for qualifying for an FHA-insured mortgage on a property with an existing ADU. This flexibility opens doors for homebuyers with limited incomes, enabling them to leverage the income generation potential of properties with ADUs.

2. ADU Integration into Standard 203(k) Rehabilitation Mortgages: Homebuyers planning to add a new ADU to an existing structure can now qualify for a mortgage under FHA's Standard 203(k) Rehabilitation Mortgage Insurance Program by considering 50% of the estimated rental income from the new ADU. This empowers homeowners with limited incomes to create ADUs, securing homeownership and bolstering ADU production as rental housing.

3. ADU Appraisal Requirements: The policy introduces ADU-specific appraisal requirements to ensure that appraisers can accurately identify, analyze, and report on ADU characteristics and expected rent. This step will help appraisers more precisely determine the market value of properties with ADUs and contribute to the growth of ADU valuation.

4. ADU Financing for New Construction: Under this policy, ADUs are now included in the list of improvements that can be financed under FHA's mortgages for new construction. This significant provision means that new homes can be constructed with ADUs from the ground up, offering an essential source of ADU production.

FHA-approved lenders are set to implement these policies immediately, providing borrowers with expanded opportunities for securing homes that include ADUs. This landmark shift not only recognizes the importance of ADUs in addressing the affordable housing crisis but also signifies the government's commitment to supporting housing solutions that benefit a diverse range of Americans. It's a policy change that underscores the transformative potential of ADUs in the realm of homeownership and housing affordability.

---

Rental income from ADUs can now help families qualify for mortgages.

Accessory Dwelling Units: Lessons From Around The Country

The Harvard Joint Center for Housing Studies hosts a video seminar titled:

Accessory Dwelling Units: Lessons From Around The Country

Although accessory dwelling units (ADUs) can address a host of housing challenges, zoning and land-use regulations often stymie homeowners who want to build them. Places like Portland, Oregon have removed restrictions and states including California, Maine, and Connecticut have new laws requiring local approval of ADUs that meet basic, statewide standards. In this talk, Ellie Sheild, a student research assistant at the Center, discusses her research on how these efforts might inform policymaking about ADUs in Massachusetts, where, in the absence of state guidelines, most cities and towns still restrict their construction. Jesse Kanson-Benanav, Executive Director of Abundant Housing Massachusetts joins Sheild in a conversation moderated by Chris Herbert, the Center’s Managing Director.

Legalizing ADU Sales in California: A Game Changer for Affordable Housing and Real Estate Investment

In a progressive move toward addressing the pressing issues of housing affordability and expanding homeownership opportunities, California has recently enacted Assembly Bill 1033 (AB-1033). This landmark legislation legalizes the sale of Accessory Dwelling Units (ADUs) constructed on a property, a concept already familiar in cities like Seattle and Portland. This development is a win-win for housing advocates, homeowners, and those aspiring to enter the housing market while simultaneously enhancing the investment potential of ADUs.

Unlocking New Possibilities: The Power of Legal ADU Sales

The legalization of ADU sales under AB-1033 signifies a significant step toward redefining homeownership dynamics and creating a more accessible path to building equity. This new legislation is particularly beneficial for those looking to break into the housing market, as it offers an innovative approach to property ownership. By allowing the separate sale of the main house and the ADU, homeowners gain an unparalleled level of flexibility.

Investing in ADUs: A Promising Proposition

The introduction of AB-1033 has also amplified the appeal of ADUs as a sound investment. Recent reports from the Seattle area offer a glimpse into the remarkable financial prospects associated with ADU sales. Sales prices for these units have exhibited a remarkable range, from $399,000 for a 493-square-foot attached ADU to a staggering $825,000 for a 1,010-square-foot detached ADU. These figures raise eyebrows, and for good reason.

In comparison to the typical construction costs, which generally fall within the range of $200,000 to $300,000 for a detached ADU, the resale prices translate into an exceptionally high return on investment. Consider this: if you leverage the equity in your home to build an ADU for $300,000 and, after a year of design, permitting, and construction, you are able to sell the unit for $600,000, you are reaping a 100% return on your investment in just 12 months. This presents an outstanding opportunity to generate wealth and make the most of your property.

Affordable Housing at Its Core

While the sale prices of ADUs may appear substantial when viewed in isolation, it's essential to assess them within the broader context of the housing market. In regions like Seattle, where median home prices for single-family homes surpass the $800,000 mark, ADUs represent a relatively affordable entry point for prospective homeowners. This trend, offering a more cost-effective means of securing property, is expected to ripple throughout California and other housing markets.

The Road Ahead

The introduction of AB-1033 and the increasing popularity of ADU sales underscore a compelling shift in the real estate landscape. As traditional housing becomes increasingly unaffordable for many, ADUs emerge as a pivotal solution to foster more inclusive homeownership. By creating an environment where starter homes are not only accessible but also financially viable, the housing market can become more attainable for a broader spectrum of families.

In summary, the legalization of ADU sales is more than just a change in legislation; it's a transformative force for affordable housing, real estate investment, and wealth creation. The ADU market, previously overlooked, is now emerging as a dynamic arena that not only provides new opportunities for homeowners but also addresses the growing need for housing affordability in an ever-evolving real estate landscape.

Detached ADUs can now be sold as a separate unit in cities throughout California. This is a game changer for ADUs as an investment and as a way to address housing affordability.

A Comprehensive Collection of ADU Links and Resources Across the US and Canada

Are you ready to embark on the journey of creating your very own Accessory Dwelling Unit (ADU) project? At Modern ADU Plans, we have curated an invaluable list of resources that outline a wide range of information and resources about ADU projects throughout the United States and Canada.

Whether you're a homeowner, builder, designer, or investor, the list below should lead you to some great information to make your project a success. And we will keep updating and adding to this list as we find more helpful information to share.

Canada ADU Resources (Also referred to as Laneway Suites and Garden Suites)

British Columbia

• Accessory Dwelling Units: Case Studies and Best Practices from BC Communities

Alberta

• Secondary Suites – Building Codes

• Secondary Suite Standards

Manitoba

• Municipal Planning Guidelines for Secondary Suites

• Secondary Suites Application Guide

Ontario

• Adding a Second Unit in an Existing House

• Building a Laneway House

Quebec

• ADUs in Quebec: Challenges and Opportunities

• Status report on ADUs in Quebec in 2021

United States ADU Resources

AARP

• All About Accessory Dwelling Units

California

• https://www.aducalifornia.org/

Washington

• City of Seattle: Accessory Dwelling Units 2022 Annual Report