Accessory Dwelling Unit ADU Plans, Designs & More

The solar-paneled PowerPatio will give power to the integrated lighting and other electric appliances. It will add a modern and pleasing vibe to your ADU design ideas. Moreover, it will make your space more functional as well as aesthetically appealing. These will be sustainable ADU design ideas that will have integrated garden space. Add pretty garden beds, a green roof, solar panels, and some indoor plants for an eco-friendly ambiance to your place.

ADUs also provide non-financial value through housing flexibility for family members, home offices, or personal use. Properties with legal, permitted ADUs command higher prices than those with unpermitted construction. ADU construction timelines range from 4-12 months depending on type and local permit processing.

The many ADU design ideas can all be explored and tried to make the ADU space more inviting and appealing. These regulations specify where and what you can build, including ADUs and the corresponding ordinance for your area. ADU builders, contractors, and companies are quickly answering the demand. Legislation is being addressed to make ADUs easier to obtain, but each mobile adu for sale location will have a specific ADU ordinance. You can work with a design team to select the unit and ensure a seamless setup and delivery process. Dwellito also offers a feasibility study for ADUs without pressure to commit to the project.

The team created an adaptable panel-based building system with unparalleled speed, quality, and sustainability. The Dwellito ADU company offers prefab ADU or site-built options, providing a wide range of ADU plans in a convenient do-it-for-me (DIFM) service. Imagine transforming your backyard into a source of passive income or creating the perfect, independent living space for family members.

Some cities are jumping on board the ADU train by improving their ordinances and development regulations to make ADUs easier to build. Frankly, there’s an underlying sentiment of resistance to change, and it’s politically challenging to pass good ADU regulations. Seattle provides the nation with a cautionary tale of the fear that surrounds the idea of ADUs amongst some neighborhood associations. Seattle’s city commissioner’s valiant efforts to improve ADU regulations were hung up in a legal battle and were postponed by a year as a result. ADUs are defined by the fact that they’re a type of housing unit—NOT a standardized structural form.

• Power, water, sewer/septic planning is where projects can stall—we help coordinate the path forward.
• In my research, I found seven of the best prefab ADUs that balance customization and cost-savings.
• Traditional ADUs take cues from classic architectural styles, such as Colonial, Victorian, or Georgian.
• In california, this disciplined approach delivers adus with dependable sqft targets, functional bedrooms, a finished bathroom and kitchen, and reliable income potential.
• The H450 model measures 16 feet by 30 feet in 450 square feet.
• From initial design concepts to permits, construction, and financing, we offer a seamless, all-in-one solution customized to your needs.
• Add bright colors and combine them with some exotic plant species.
• The term “accessory dwelling unit” might sound institutional, but it’s the most commonly-used term across the country to describe this type of housing.
• Accessory Dwelling Units or ADUs have emerged as a popular solution to housing shortages.
• Add log walls and some woodland décor with an additional stone fireplace to elevate the charm.
• Add some cozy furnishings for a comfortable and practical experience of hosting guests in your ADUs.
• Yet, most of our legacy housing stock, and even our new residential housing stock, is designed for families of 4 or 5 people.
• A $150,000 ADU might add $180,000-$250,000 to property value depending on location and rental market strength.
• Create a private entrance and add a pretty kitchenette to your ADU design ideas.
• From start to finish, their team was incredibly professional and efficient.

A one-stop shop with sample floor plans, resources and tools plus accessibility features and translation. Add floor-to-ceiling glass and use minimal frames with an open floor plan. Create walls full of large windows to bring in the outside views and create a stunning visual appeal in your ADU design ideas. Add a sleek and modern extended PowerPatio to your ADU design ideas.

Do I need a permit to build a guest house?

Submit plans showing compliance with local ADU regulations including size limits, setbacks, height restrictions, and parking requirements. Building inspections occur at key phases—foundation, framing, rough-in, and final. You cannot legally occupy or rent an ADU without a certificate of occupancy proving code compliance.

Family-Owned Construction

Add minimalist furniture in contrast to white walls and natural wood with ample natural light. A prefabricated unit is the perfect choice for someone who wants to save time and money while creating their dream home. When selecting the best prefab ADUs, I narrowed down the options to the ones we were considering. Want to know how adding an ADU could impact the sale of your home?

Cluster wet areas (kitchen and bathroom) together sharing plumbing walls to minimize costs. Place bedrooms away from kitchen/living spaces for noise control. Consider your intended use—rental ADUs need durable finishes and clear separation from the main house, while spaces for family members might connect more openly. Universal design features like no-step entries and wider doorways add future flexibility. An adu builder converts adu designs into buildable drawings, then sequences additions or renovation stages that satisfy california codes. We lock specs for kitchen, bathroom, bedrooms, and room sizes by sqft, confirm building details, and coordinate a contractor plus contractors for consistent quality.

They provide assistance with permits, project management, and even a free property assessment. The website has a good section of FAQs and offers an instant quote with no hidden costs. The Instant Living 430 model is 430 square feet measuring 15 feet by 29 feet. I learned in the countless hours I spent diving further into the tiny house and ADU world. I may have seen so many ADU companies and ADU builders just to realize how many options exist.

About Go ADU Construction

It will be a retro style to add a unique ambiance and a touch of nostalgia to your ADU. Add exposed Dutch work and concrete floors with some metal and wood accents all around. This will give a unique blend of urban spaces and industrial elegance to your ADU space. Add log walls and some woodland décor with an additional stone fireplace to elevate the charm. These will give a rustic and cozy appeal to your ADU design ideas.

ADUs are also seen as an environmentally friendly housing option. They typically require fewer resources to build and maintain compared to new single-family homes. Moreover, ADUs can contribute to more sustainable urban development by increasing density without the need for sprawling new developments. This can reduce the overall carbon footprint of housing in California.

About Adu solutions la

I just wrapped up an ADU project with Go ADU, and I’ve got to say, I’m really happy with how it turned out. They kept the site super clean, which isn’t always the case with contractors. There were a couple of hiccups, but they were quick to let me know and always had a plan to keep things moving.The final result looks great—exactly what I was hoping for. I hired Go ADU Construction to build an ADU for us, it just got completed. They finished the job within the exact time frame that they promised. Experience a personalized approach to ADU construction with GO ADU.

No Grass Backyard Ideas

I focused on 250 sq ft to 500 square foot options to allow for enough space for my daughter to live comfortably but could accommodate an office in the future. Stick-built ADUs are constructed on-site, offering customization but at a higher cost and longer construction time. The Solo 2 is an entry-level Accessory Dwelling Unit with 384 square feet measuring 16 feet wide and 24 feet deep. Bay Modular ADU company offers services from delivery to installation and site preparation.

ADU permits include building, electrical, plumbing, and mechanical permits. Many cities now offer streamlined permitting for ADUs with faster review (2-8 weeks). Submit complete plans showing floor layouts, elevations, site plans with setbacks, and utility connections.

• The specific requirements may vary based on your local regulations.
• Having an extra space by your side to rent or move in is always a much-preferred idea in today’s urban eras.
• I’m a total sucker for a shed-type roof with transom windows, you know?
• When I moved to DC, my first home had an informal ADU in the basement.
• Interiors might feature crown molding, wainscoting, and traditional cabinetry, offering a timeless and elegant living space.
• I’m thrilled with the final product and will absolutely be using GoADU again for my next project.
• Use simple furnishings with neutral colors and a mix of natural materials.
• A trusted adu team begins with a clear consultation to understand your goals for an accessory dwelling unit.
• Moreover, it will make your space more functional as well as aesthetically appealing.
• Create your ADU design ideas mobile, which can be easily moved from one place to another.
• We pay meticulous attention to detail and durability to provide homes that stand the test of time.
• Here’s a closer look at why more people are building ADUs in the Golden State.
• Detached ADUs are standalone structures in your backyard, offering maximum privacy and full design flexibility.
• The Summit is a 364 square feet model measuring 14 feet by 26 feet.
• California has offered the CalHFA ADU Grant Program (up to $40,000) to reimburse certain pre-development costs (design, permits, site prep, etc.).

We map out floor plans by sqft, confirm design choices for bedrooms, a bathroom, and kitchen, and align the house renovation steps so homeowners avoid delays. Our builders coordinate contractors, schedule inspections, and finish adu building that adds space and income, creating adus that feel like part of your homes and property. All ADU builders, deliver adu services, but we go further with transparent financing guidance tied to design choices, sqft, and average costs. We model rental income scenarios for adus, align backyard layouts, and compare floor plans for bedrooms, bathroom counts, and kitchen efficiency. Adu companies bring local experience with accessory dwelling units, zoning, and construction in southern california. Even if your house has space, a well-planned adu can convert underused areas, expand bedrooms, add a bathroom and kitchen, and create income while respecting nearby homes.

Is it time for you to consider building an ADU?

California has long grappled with a severe housing shortage and skyrocketing real estate prices. Building an ADU provides a more affordable and practical solution for many homeowners. Instead of buying a new property, adding an ADU to an existing lot can create additional living space at a fraction of the cost. This is particularly attractive in urban areas where space is limited and property prices are high. An illegal apartment is a synonym for an unpermitted ADU, or an informal ADU. This is an additional housing unit that is added to a property without the correct permits.

Related ADU Pages

Keep costs reasonable by choosing garage conversions or attached ADUs over detached new construction when possible. Standard windows, doors, and fixtures from major suppliers beat custom options by 30-50% without sacrificing quality. Keep the kitchen and bathroom in one “wet wall” to minimize plumbing costs since running pipes is expensive.

Clever ADUs

• Rustic ADUs bring the charm of country living to urban and suburban settings.
• Imagine transforming your backyard into a source of passive income or creating the perfect, independent living space for family members.
• For one thing, the fact that they’re secondary housing units on single-family residentially zoned lots puts ADUs into a unique category.
• A turnkey solution to display and manage your jurisdiction’s pre-approved plans program.
• At ADU Express, we specialize in designing and building high-quality ADUs that maximize space, value, and functionality.
• A standalone structure built in the backyard, detached ADUs offer maximum privacy.
• Short-term rentals (Airbnb/VRBO) face additional restrictions in many areas.
• Electrical service typically runs through a sub-panel from your main electrical panel ($1,500-$3,000).
• They finished the job within the exact time frame that they promised.
• The unique and innovative ADU design ideas will make your space not only worth living but also a luxurious spot to be an interesting investment option.
• They cost more ($150,000-$300,000+) due to complete new construction but provide better rental income potential and property value increases.

This type of ADU is construction on the lot of a single family home, often in the back or side yard. When you’re ready, you’ll get guidance on which model fits your space, your goals, and your timeline. Accessory Dwelling Units or ADUs have emerged as a popular solution to housing shortages. We’ll help you map the smartest path—from plan selection and permitting to utilities and installation coordination.

Change orders inevitably happen during construction, but manage them carefully. Get written quotes for any changes including cost and schedule impacts before approving. Small changes add up quickly, potentially busting your budget.

Use it throughout except possibly the bedroom where carpet adds warmth. For kitchens, use apartment-sized appliances that fit small spaces while providing full functionality. Stock cabinets at $75-$150 per linear foot provide adequate storage.

A JADU (Junior ADU) is typically smaller and often created within the existing home footprint (rules vary). If you’re deciding between an ADU and JADU, we can help you compare tradeoffs based on your goals. We help you connect the dots so the project stays coordinated from concept to move-in. Our expert team of designers and builders handles everything from planning to construction. Use simple furnishings with neutral colors and a mix of natural materials. The modern design will give a minimal and contemporary vibe to your ADU spaces.

Cash-out refinancing replaces your existing mortgage with a larger one, taking the difference in cash. Some cities and states offer ADU-specific loan programs—check with your local housing authority. Specializing in new construction projects across California, Adusolutionsla offers tailored building solutions that prioritize craftsmanship and durability. We work with clients from concept to completion to ensure your vision becomes reality.

Large windows bring in natural light and connect to outdoor spaces. Built-in storage, wall-mounted fixtures, and multi-purpose furniture optimize every square foot. Detached ADUs are standalone structures in your backyard, offering maximum privacy and full design flexibility.

Bring in an adu builder early so an adu expert can shape floor plans, bedroom counts, bathroom specs, and kitchen layouts that match your property and average budget. We translate design ideas into construction details, clarify sqft, and make sure adu development supports your house, room flow, and home renovations. This keeps adu services focused on real outcomes for homeowners in california, with builders and a contractor aligned on scope, schedule, and quality.

ADU Can I Build Tool

Add bright colors and combine them with some exotic plant species. Place outdoor showers and get a vibrant, lush, tropical ambiance in your ADUs. Add pretty wrap-around porches with some rocking chairs and shutters. These will give a warm and welcoming southern aesthetic appeal to your ADU spaces.

Use terracotta tiles with Adobe walls and some cactus plants for a desert-like look. Add warm and earthy tones for a pleasing vibe to your ADU design ideas. Use features like smart lighting, automated climate control, and some voice-activated systems to create a smart, tech-savvy place. Integrated the latest technology for convenience and comfort in your ADU design ideas. Some property owners may see significant increases in value, especially if you are on the West Coast.

Why Choose ADU Express?

An accessory unit is a secondary and architecturally diminutive unit on a property that already has a primary residential unit. Austin, Texas has also experienced a substantial bump in ADU development since legislative zoning changes in 2015. Expect to secure permits for electrical, plumbing, structural work, among others. Partnering with a company like HOMEPLEX ensures compliance with local codes. Tight sealing and high insulation help reduce heating and cooling costs, often by up to 60%. Whatever your goal, you can choose a kit designed to support it.

on lots with a proposed multifamily dwelling, or up to eight detached ADUs

The term “accessory dwelling unit” might sound institutional, but it’s the most commonly-used term across the country to describe this type of housing. Because the full name is a mouthful, we use the shorthand “ADU” instead. Need financing for your accessory dwelling unit construction project? Secure specialized construction loans today and get the capital you need to start building your investment property. Luxury vinyl plank (LVP) flooring works perfectly in ADUs at $2-$5 per square foot installed.

One of the things that impressed me most was the cleanliness of their worksite. Their attention to detail and commitment to a clean workspace made the entire process a breeze. We are a family-owned and operated company with a passion for ADU planning and construction, serving the Los Angeles community since 2017. We have personally experienced the life-changing impact of Accessory Dwelling Units, inspiring us to share these benefits with our valued clients.

of existing units on the lot.

At Adu Solutions La, we specialize in high-quality new construction tailored to the way you live. Whether it’s a custom home, an elegant guest house, or a refined rental property, we offer a fully managed, stress-free experience with meticulous attention to detail. I couldn’t be happier with the work Go ADU did on my garage conversion. They were professional, efficient, and communicated every step of the process. The finished product is stunning, and I’ve already rented it out! If you’re considering an ADU project, I highly recommend them.

Luckily, the ADU demand has created new financing products to help ordinary homeowners take advantage of the opportunity. New ADU grant programs have popped up in some areas to help encourage the projects. The H450 model measures 16 feet by 30 feet in 450 square feet. I like the openness of the floor plan, which can be utilized as an office space. Customizable units are available, including the option of a fully furnished setup. The Meka Modular ADU builders specialize in innovative construction and assembly techniques, aiming to provide enhanced value to customers.

The Bay Area is experiencing a boom in the construction of Accessory Dwelling Units (ADUs), and it’s not hard to see why. Here’s a closer look at why more people are building ADUs in the Golden State. Traditional ADUs take cues from classic architectural styles, such as Colonial, Victorian, or Georgian. These units often include decorative elements like cornices, columns, and brick or stone facades. Interiors might feature crown molding, wainscoting, and traditional cabinetry, offering a timeless and elegant living space.

• Add minimalist furniture in contrast to white walls and natural wood with ample natural light.
• Accessory Dwelling Units or ADUs have emerged as a popular solution to housing shortages.
• From initial design concepts to permits, construction, and financing, we offer a seamless, all-in-one solution customized to your needs.
• The more I looked at the product available, the more I started to put this option on the list of contenders.
• In california, this disciplined approach delivers adus with dependable sqft targets, functional bedrooms, a finished bathroom and kitchen, and reliable income potential.
• Use natural materials and add plenty of indoor plants, vertical garden elements, and some exotic species of flora.
• However, life had other plans, and my daughter chose a college two hours away, putting our ADU dreams on hold.
• They are fully equipped with their own kitchen, bathroom, living area, and sleeping quarters, making them a self-contained living space.
• Need financing for your accessory dwelling unit construction project?
• Traditional ADUs take cues from classic architectural styles, such as Colonial, Victorian, or Georgian.
• Our experienced team conducts regular inspections to ensure every aspect of the ADU meets the highest standards of quality and safety.

Design

• The Solo 2 is an entry-level Accessory Dwelling Unit with 384 square feet measuring 16 feet wide and 24 feet deep.
• Detached ADUs are standalone structures in your backyard, offering maximum privacy and full design flexibility.
• Cluster wet areas (kitchen and bathroom) together sharing plumbing walls to minimize costs.
• Moreover, it will make your space more functional as well as aesthetically appealing.
• Submit plans showing compliance with local ADU regulations including size limits, setbacks, height restrictions, and parking requirements.
• Create your ADU design ideas mobile, which can be easily moved from one place to another.
• There were no surprises, no delays—just quality workmanship and exceptional service.
• Most cities now allow ADUs in residential zones, but specific requirements vary.
• Let’s broaden that mental model by exploring and understanding the range of common ADU types.
• After all, there are options like ADUs that add not only to the functionality of the space but also to the property’s overall value.
• I’m thrilled with the final product and will absolutely be using GoADU again for my next project.
• This exotic and vibrant design for your ADU will create a pretty Moroccan décor for your place.

From initial design concepts to permits, construction, and financing, we offer a seamless, all-in-one solution customized to your needs. With owner involvement at every stage, your project is in caring and capable hands. We help you choose an ADU layout that fits your property, budget, and goals (rental, family, office). High-quality construction, completed on time—so you can enjoy your new space sooner.

With over 20 years of experience, our dedicated team ensures each ADU project is completed with meticulous attention to detail and superior craftsmanship. We pride ourselves on our customer-centric approach, working closely with you to bring your vision to life while providing innovative solutions and personalized service. Trust Ingenuity Construction Group to create an ADU that enhances your property’s value and functionality.

Use natural materials for a cozy and warm ambiance in your ADU design ideas. Add a wood-burning stove with exposed wooden beams and stone accents for a rustic cabin feel. The increase in demand for these small structures is coming from all directions, especially if you are unwilling to convert an attached garage into a living space. Plant Prefab – Plant Prefab aims to revolutionize high-quality housing construction, making it faster, easier, and more sustainable.

Conversion: At least one conversion ADU within an existing multifamily

Some residents in California have reported a property value increase of up to 20-35% after adding an ADU to their property. In my research, I found seven of the best prefab ADUs that balance customization and cost-savings. There are so many ideas to turn your small structure into a fabulous space. They can practically back up to your backyard and drop the house off.

• Submit complete plans showing floor layouts, elevations, site plans with setbacks, and utility connections.
• Typically, it takes several months from planning to completion.
• Their accessory dwelling units are built under modular building standards and are made of steel, concrete, and EPS foam designed to last a lifetime.
• Some property owners may see significant increases in value, especially if you are on the West Coast.
• Was it literally just the oven and kitchen sink that weren’t permitted?
• Rental income provides ongoing returns, with well-located ADUs often generating 5-8% annual returns on construction costs.
• Download my free eBook of ADU Design Principles to take your knowledge to the next level.
• For homeowners looking to maximize their property’s potential, building an ADU is an option well worth considering.
• Receive a hand-picked designer introduction in your area based on your budget, style, and project.
• When learning about a new design concept like an ADU, it’s natural to want to know exactly what that concept looks like in the flesh.
• This style is perfect for those who appreciate a more edgy and urban aesthetic.
• We protect the house and property during home renovations, plan room finishes, and track average timelines.
• Try and optimize insulation to reduce energy consumption and be more sustainable in your approach.
• ADUs are also seen as an environmentally friendly housing option.
• Match or complement your main house’s exterior for visual harmony.

This depends on what your local zoning code says is permissible. In other cases, an ADU may not be allowed, but alternatives such as a guest house or a detached office or bedroom with a bathroom may be allowed. Use fiberglass or acrylic tub/shower surrounds—one-piece units eliminate leak-prone seams. Wall-mounted vanities make small bathrooms feel more spacious.

Costs run highest ($150,000-$300,000+) due to complete new construction, but rental potential and property value increase justify the investment. Garage conversion ADUs transform existing garages into living space, offering the most affordable option ($80,000-$150,000) since walls, roof, and foundation exist. Many cities waive parking replacement requirements for garage conversions. Downsides include losing garage storage and often limited natural light.

setbacks cannot preclude an ADU of at least 800 square feet.

Find the sweet spot where you have adequate space without paying for square footage you don’t need. Energy-efficient windows, insulation, and HVAC reduce long-term operating costs and may qualify for rebates offsetting higher upfront expenses. We provide comprehensive ADU services including planning, design, permits, construction, and final inspection. Our team handles every aspect of the project from start to finish. Mid-century modern ADUs draw inspiration from the 1950s and 1960s, emphasizing simplicity and integration with nature. These designs often feature flat planes, large glass windows, and open floor plans.

Add options like large windows, balconies, or attached decks to your ADU design ideas. These will create an airy ambiance for relaxation and maximum views of the landscape outside. Add exposed wooden beams with loft spaces and add a large sliding barn door to it. These ADU design ideas will add a rustic charm with a modern twist to your place. Use natural materials and add plenty of indoor plants, vertical garden elements, and some exotic species of flora. The lush greenery will create a serene and wild atmosphere in your ADU design ideas.

• The eclectic and colorful choices will give a vibrant bohemian yet relaxing ambiance to your ADU spaces.
• This style is perfect for those who appreciate a more edgy and urban aesthetic.
• The Dwellito ADU company offers prefab ADU or site-built options, providing a wide range of ADU plans in a convenient do-it-for-me (DIFM) service.
• For kitchens, use apartment-sized appliances that fit small spaces while providing full functionality.
• Download my free eBook of ADU Design Principles to take your knowledge to the next level.
• ADUs are also seen as an environmentally friendly housing option.
• Partnering with a company like HOMEPLEX ensures compliance with local codes.
• Receive a hand-picked designer introduction in your area based on your budget, style, and project.
• It’s a self-contained living space located on the same plot as the primary residence.
• Costs run highest ($150,000-$300,000+) due to complete new construction, but rental potential and property value increase justify the investment.
• The dark sections represent the percent of one person households in 2014.
• Most ADUs connect to the main house’s existing utilities through sub-meters or shared connections, which costs significantly less than separate utility services.

PropertyBuild Calculators

With a passion for innovative design and expert craftsmanship, we make the ADU process seamless—from concept to completion. Our ADUs are designed to increase rental income and long-term property value. Whether you’re converting an existing structure or building a new one, Maxable can guide you through everystep. Being an affordable option and a versatile and flexible structure for homeowners, the demand for ADUs has increased substantially.

This design often features large windows, neutral color palettes, and high-quality, functional materials. The goal is to create a sleek, simple, and efficient living space that feels larger than it actually is. ADUs need water, sewer/septic, electricity, and heating/cooling like any residence. Most ADUs connect to the main house’s existing utilities through sub-meters or shared connections, which costs significantly less than separate utility services. Electrical service typically runs through a sub-panel from your main electrical panel ($1,500-$3,000). Water and sewer lines extend from the main house’s plumbing ($3,000-$10,000 depending on distance).

Add unique architectural details and some modern upgrades to your ADU design ideas. Create a wonderful historic charm blended well into modern décor and patterns, giving a distinctive ambiance to your ADUs. Use sliding glass doors, outdoor kitchens, and some covered patios to create stunning open-air ADU design ideas. These will also create a seamless integration of doors and outdoors, making your place more inviting. Add decorative trim, stained glass windows, and antique furnishings to your ADU design ideas for a charming appeal.

• When I moved to DC, my first home had an informal ADU in the basement.
• Garage conversions take shortest at 4-6 months since the structure exists.
• The website has a good section of FAQs and offers an instant quote with no hidden costs.
• Many cities eliminated parking requirements for ADUs to encourage construction.
• California has offered the CalHFA ADU Grant Program (up to $40,000) to reimburse certain pre-development costs (design, permits, site prep, etc.).
• An Accessory Dwelling Unit (ADU) is a secondary housing structure built on the same lot as a primary residence.
• Whether you can build a backyard ADU depends on your local zoning regulations.
• Here’s a closer look at why more people are building ADUs in the Golden State.
• Moreover, it will make your space more functional as well as aesthetically appealing.
• I almost passed this option because the website was underwhelming until I found their pictures!
• I’m a total sucker for a shed-type roof with transom windows, you know?

This will add a touch of sleek and sophisticated city ambiance to your place. Add sliding Shoji screens, tatami mats, and a mini Zen garden space to your ADU design ideas. These will add a peaceful and tranquil ambiance to your space with natural and appealing elements. Backyard prefab ADUs are a fantastic way to increase cash flow, create housing in urban areas, house a family member, create an in-law suite, or create a home office.