Check Out These 24 Companies That Make ADU Kits

Whether it’s for rental income, family, or extra space, we help you unlock your property’s full potential. 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.

Students and New Planners

No other ADU home builders in Southern California have pushed the envelope as much as we have. Many of the designs and industry trends you see in the ADU Business were pioneered by DREC. Chicago requires an intake application reviewed by the Department of Housing before a building permit application goes to the Department of Buildings. The Chicago Department of Housing ADU page has current application materials and zone maps.

Key Reasons Why Choose ADU4LESS

Deep knowledge of building codes across OC, LA, Riverside, San Bernardino, and San Diego County means faster permit approvals, zero compliance surprises, and a fully certified final build. One of the most common questions we are asked when we first speak to a prospective ADU client is what separates us from other ADU home builders in Southern California? We have years of experience, great customer service and a competitive pricing. Our attention to detail that makes us your top pick, and our level of quality is years ahead of our competition. From this page you can search for resources that provide background, policy guidance, and examples of local plan recommendations and zoning standards for ADUs from across the country.

Accessory Dwelling Units (ADUs)

• The walls and roof panels of these designs are factory assembled.
• We have spent the past 2 decades building Single Family Residents, Commercial Properties as well as High-End Spec Homes.
• As long as you meet the established guidelines, you can build an accessory dwelling in LA by submitting plans to the building department and obtaining a permit.
• These plans are required for safe and compliant Accessory Dwelling Unit construction in Phoenix.
• Deltec Homes, based in North Carolina, specializes in intriguing custom roundhouses that are available in prefabricated kits.
• From garage conversions to custom ADUs, our team delivers top-quality.
• A conversion unit is connected to the existing building such as within an attic or basement while a coach house is a separate, detached structure.
• Garage conversions are particularly popular in Los Angeles because most single-family homes have garages that are underused for vehicle storage.
• 500+ accessory dwelling units built across Orange County, LA County, Riverside County, San Bernardino County, and San Diego County.
• The ADU Pro® (CSLB # ) is the #1 rated ADU contractor in Orange County.
• This conversion includes new framing, putting in utility connections, and finishing the interiors.
• Yes, while we specialize in ADUs, Eastern ADU also handles new construction, renovations, and other residential projects.
• Studio Shed provides modular ADUs ranging from about 250 square feet up to 1000 square feet.

Once California passed the most recent Assembly Bill (AB) 1584 the term has become so well known that our industry has blown up. Our ADU builders make the entire process completely convenient for you. We pull the permits and handle all of the construction-related issues. Since the late 20th century, many communities have created programs to preserve or expand the local supply of affordable housing. Many older communities have an existing supply of illegally created ADUs. Some of these communities offer, or have offered, some form of limited amnesty to owners of illegal ADUs.

Proudly Serving Los Angeles and the Surrounding Area

You also won’t get the SIPs subfloor, upgraded exterior walls or roof panels, windows, doors, skylights, or exterior wall wiring chases or plumbing chases. If you want classic metal roofing, you’re also going to have to pay more. Like many ADU kit suppliers, Mighty Small Homes supplies the basics in their kits. You will have to construct your own foundations, but you will get the exterior walls, roof panels, and the ridge beam. All kits are pre-engineered at their factory and delivered to your site. Of course, the favorite ADU sizes are all available too, in one and two-story configurations.

Types of ADUs allowed

Once we understand your property and goals, we develop a design that fits your needs and works with the property. We help plan the layout, exterior appearance, finishes, and other important details of your ADU. As mentioned, your ADU can be a great source of passive income. Learn how you can take advantage of your new living space through our articles on Do ADUs Work Well As Rentals and How Much Can You Rent Out Your ADU For. As a fully licensed contractor, My ADU knows the ins and outs of permitting, designing, and constructing an ADU—making it a reliable choice for your ADU kit needs. The firm’s competitive pricing and transparent project management process makes it one of your go-to options for ADU kits in Oregon.

Garage Conversion Cost Guide for 2026: Complete Pricing Breakdown

• Our experienced project managers ensure that every aspect of the job stays on track, on budget, and on time.
• Typically, manufactured ADUs are built entirely off site and then shipped and craned-in, while modular ADUs have large pieces built off-site and then fully assembled on-site.
• In reality, permitting timelines in cities like San Diego often take longer than what’s promised on marketing materials.
• Then, pick one of our three curated design styles (Coastal, Modern, or Farmhouse) to match your aesthetic.
• Adding a separate living unit changes your coverage needs, and a standard homeowners policy may not cover a tenant-occupied unit.
• Depending on your goals, property conditions, and budget, one company may be a better fit than another.
• Tom now has years of general-contracting experience, building custom and speculative new construction homes, additions, accessory dwelling units, and renovations.
• 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.
• Surely, it is an exciting adventure that you embark on, and it will transform your mundane living, but in the end, you will understand what amazing benefits it gives you.
• State regulations allow local governments to decide whether ADUs can be listed on short-term rental platforms such as Airbnb.
• This type of ADU shares at least one wall with your primary residence.
• This «ADU boom» is largely in response to the state’s housing crisis.
• What’s really cool is that there are standard options that include bathrooms, kitchens, and outdoor showers.
• Even though the plans are created by the team, you can introduce your own vision into the project.
• Many of the ADU kits featured in our list only offer basic structural components.

This keeps adu services focused on real outcomes for homeowners in california, with builders and a contractor aligned on scope, schedule, and quality. An Accessory Dwelling Unit (ADU) is a secondary residential unit located on the same lot as a primary single-family home. These units can be either attached to the main house, such as a converted garage or basement, or detached, like a standalone cottage in the backyard. ADUs come in various sizes and designs, typically ranging from 400 to 1,200 square feet. They are fully equipped with their own kitchen, bathroom, living area, and sleeping quarters, making them a self-contained living space. Studio Shed provides modular ADUs ranging from about 250 square feet up to 1000 square feet.

Ready to explore an ADU on your property?

It’s important to view these base prices as a framework and to work with any provider to get a fully scoped proposal tailored to your specific property & needs. We analyze your property, zoning regulations, and goals to create a personalized feasibility report. This is often the most cost-effective way to add an ADU without expanding the building footprint. We put in passive cooling strategies and choose good quality, Low-Emissivity (Low-E) windows from companies like Milgard or Andersen.

A quick guide to the regulations that shape what you can build (and how)

One of the things that impressed me most was the cleanliness of their worksite. They were meticulous about keeping the area tidy, minimizing disruption to my daily life.I would highly recommend Gil and Hugo from Go ADU to anyone considering building an ADU. Their attention to detail and commitment to a clean workspace made the entire process a breeze. The modern minimalist style emphasizes clean lines, open spaces, and a lack of clutter. 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.

Financing guidance

• Gil leads his team with honesty and a client-first mindset, qualities that are rare in the construction industry.
• It’s important to view these base prices as a framework and to work with any provider to get a fully scoped proposal tailored to your specific property & needs.
• State law now gives most Southern California homeowners the right to build.
• We’ll also take care of any final punch list items so that you can enjoy the extra space, income, and value your new ADU provides.
• Gil and his amazing team just completed my ADU project in less than five months.
• DADUs are permitted in several zoning districts, giving homeowners room to expand.
• Chicago’s ordinance specifically names basement units, attic units, and detached coach houses as eligible types within its pilot zones.
• Our dedicated team is committed to delivering quality ADUs with unmatched expertise.

Every ADU we build meets or goes beyond the Phoenix building codes. Build your ideal ADU with our end-to-end construction services. From initial design to final build, we prioritize quality and detail. We’ll guide you through designing an ADU that meets your needs, maximizes your space, and adheres to local regulations.

Building ADUs That Perform in Los Angeles

Surely, it is an exciting adventure that you embark on, and it will transform your mundane living, but in the end, you will understand what amazing benefits it gives you. The disadvantages of these forms of property fade before the benefits they offer to a homeowner. There are many reasons for this attitude from society, so let’s examine them closely and figure out what’s all the fuss about.

Proudly Serving Phoenix and the Surrounding Area

In california, this disciplined approach delivers adus with dependable sqft targets, functional bedrooms, a finished bathroom and kitchen, and reliable income potential. Pros ADU Builders is a team of passionate local experts specializing in Accessory Dwelling Unit construction. We’re not just builders — we’re problem solvers who care about your property, goals, and lifestyle.

• We specialize in ADUs, full house remodels, and new construction for residential and commercial properties.
• Now you need a way to build on it without delays, cost overruns, or guesswork.
• The detached ADU provides complete privacy for occupants, design flexibility, and the highest property value increase of any ADU type.
• Building an ADU provides a more affordable and practical solution for many homeowners.
• Design coordination and preparation of site and floor plans take another two weeks.
• It helps in identifying the best spot for your ADU by evaluating your property.
• As a fully licensed contractor, My ADU knows the ins and outs of permitting, designing, and constructing an ADU—making it a reliable choice for your ADU kit needs.
• They know and can lecture you about obtaining a building permit, the zoning rules in the area, the distance where your small home has to connect to the main house, and many other intricacies.
• Its efficient 20 by 22 foot footprint makes it a smart choice for backyards, wooded lots, or properties with limited buildable area.
• Los Angeles ADU Solutions focuses on the precise engineering and construction required for ADUs in Southern California.
• ADUs are known by many names, including granny flats, in-law suites, backyard cottages, and secondary suites.
• Lisa Ward explains the benefits of building an ADU in her backyard for her aging parents.
• The techniques you need to assemble a Bungalow in a Box are efficient and quick to learn and do.
• Our additional dwelling unit plans are designed to meet Georgia regulations and your vision, while boosting the resale value of your property.
• An adu contractor sets the design and construction cadence, manages the adu team, and aligns contractors so your accessory dwelling units move from planning to building without confusion.

Attached Accessory Dwelling Unit

• ADUs are also seen as an environmentally friendly housing option.
• However, it’s important to note that adding an extra story or two or outfitting your new unit with high-end finishes like hardwood floors and stonework will drive costs up considerably.
• It can be added to the side, rear, or top of the existing home.
• This is important information to have because it will help you determine if building an ADU is a good investment for you.
• ADUs go by many different names throughout the U.S., including accessory apartments, secondary suites, and granny flats.
• Always consult appropriately certified and licensed professionals who can evaluate and advise you about your specific property, circumstances, and goals before making decisions.
• Our ADU Design services include complete architectural plans, structural engineering, and site analysis.
• By prioritizing quality, transparency, and personalized service, we are committed to helping you maximize your property’s value by creating a custom ADU that meets your unique needs and goals.
• Whether it’s incorporating solar panels or using high-quality, energy-efficient materials, this company ensures that your ADU kit will be environmentally friendly and built to last.

The detached ADU provides complete privacy for occupants, design flexibility, and the highest property value increase of any ADU type. During design, we collaborate on custom built-in features that make your ADU one-of-a-kind — maximizing functionality and living quality in every square foot. We have been building ADUs in Southern California before there was even a term used. We typically called them garage conversions or mother-in-law houses or granny flats. It is only recently that the term ADU (Accessory Dwelling Unit) has become so popular.

Their offerings include studio layouts, one-bedroom, and two-bedroom floor plans. All of their ADU models are single-story, except for one unique 528 square foot carriage house design built over a garage. Studio Shed also offers smaller structures under 250 square feet, marketed as home offices or backyard studios. I’ve had the pleasure of getting to know Gil Vaisman and the Go ADU Construction team, and I can confidently say they represent the very best of what you’d hope to find in a Los Angeles ADU builder. Gil leads his team with honesty and a client-first mindset, qualities that are rare in the construction industry.

Common ADU types we help homeowners plan

Secondary legislation encouraging the building of ADUs was passed in 2018 and 2019. SitkaCrafted for backyard use, whether as a guest suite, artist studio, or creative workspace, our Sitka ADU Kit offers limitless flexibility within a compact framework. Gil and his amazing team just completed my ADU project in less than five months.

Portland, Oregon ADU Builders

They’re intended for long-term residential use, and listing an ADU on platforms like Airbnb may violate the ordinance that permitted it. Most municipalities require at least one additional off-street parking space per ADU to avoid straining neighborhood parking. Some communities waive this requirement when the property is within a defined distance of a transit stop or rail station, which is relevant for properties in the Chicago metro area. Designing an ADU requires nuance, understanding and problem solving for a complex situation. From vision to execution, we provide experience, resilience & honesty. Ensure quality with a final inspection before receiving the keys to your new ADU.

At Pinnacle ADU Builders, we specialize in creating affordable ADUs that maximize your property’s value. We guide you through the entire process—design, permits, and construction—making the expansion process stress-free and budget-friendly. From initial planning and permitting to construction and final inspection, we handle every step with precision, ensuring a hassle-free process. The ADU Pro® is the #1 rated ADU contractor across Orange County, Los Angeles County, Riverside County, San Bernardino County, and San Diego County. We know every city’s permitting process, building codes, and zoning requirements. Size limits across Illinois communities typically tie ADU square footage to a percentage of the primary dwelling’s floor area or set an outright cap.

Local subcontractors will need to complete the drywall, insulation, electricity, and plumbing, as well as the heating, ventilation, and air conditioning (HVAC) requirements. Customers have the option to buy shell-package kits, order according to their own plans, or get the company to do it all for them. Most kits don’t include plumbing and other utilities, and many don’t include finishes of any kind. In general, it’s just a good idea to know what your city and county allow and to check with the building and permit department on what you can and cannot do.

Studio Shed vs Abodu vs Villa Homes: Comparing Popular Prefab ADU Options

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. Homeowners get a side-by-side view of options so the property plan supports additions, a garage conversion if needed, and a renovation roadmap that fits california timelines. Pros ADU Builders, we specialize in building high-quality Accessory Dwelling Units (ADUs) that maximize your property’s value and functionality. From garage conversions to backyard guesthouses, we deliver fully customized, code-compliant ADU solutions tailored to fit your needs.

This process adds a lot of usable square footage to your property in Phoenix. It does this without expanding the building footprint on your lot. A Garage Conversion in Phoenix can add more space for family or even create a rental unit. Phoenix ADU Solutions, Inc. handles all the necessary permits and inspections for these Garage Conversions in Phoenix, AZ. Our Garage Conversion service in Los Angeles, CA, takes your current garage structure and makes it into a full Accessory Dwelling Unit (ADU). This conversion includes new framing, putting in utility connections, and finishing the interiors.

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. Many homeowners see ADUs as a lucrative investment opportunity. By renting out the unit, owners can generate a steady stream of income. This additional revenue can help offset mortgage payments, property taxes, and maintenance costs.

• This makes a Detached ADU a good choice for rental units, a guest house, or for families with multiple generations living together.
• Eachmodel is stick built on site and pre-engineered to meet local building codes, ensuring a faster path from permitting to passive income.
• We are one of the few builders in Southern California to offer in house financing for your ADU Project.
• Los Angeles ADU Solutions builds Attached ADUs for homeowners in Los Angeles, CA.
• Customers have the option to buy shell-package kits, order according to their own plans, or get the company to do it all for them.
• Whether it’s rental income, family space, or future flexibility, we’ll help design an ADU to make the most of your property.
• This helps to avoid costly delays or rework during the ADU building process.
• These ingenious ADU kits come with all the instructions handy adults need to put them together.
• Detached ADUs typically command the highest rental income because they offer complete privacy and separation.
• Explore our  Portfolio  for inspiration and examples of finished projects.
• For the most accurate estimate for your Tennessee property, we encourage you to connect with our team.

Los Angeles ADU Solutions is proud to serve Los Angeles, CA and the surrounding communities. Most Illinois ADU ordinances prohibit listing ADUs on short-term rental platforms. They’re intended for long-term residential use, and violations can jeopardize your permit. ADUs are generally prohibited from short-term rental platforms in most Illinois jurisdictions.

• The timeline for our turnkey ADU service is approximately 8 to 12 months from start to finish.
• Being well-informed up front helps avoid costly surprises later on.
• I wouldn’t hesitate to recommend them to anyone in need of reliable ADU construction services.
• We understand the specific rules for ADUs in Los Angeles, including zoning and permit requirements.
• If you want a net-zero ADU, look at a Steelblox unit for inspiration.
• Factory-built construction can reduce on-site build time and help keep the project predictable—especially when you have a clear plan for site work, utilities, delivery access, and inspections.
• Typical accessory dwelling unit costs range from $130–$250 per sq ft, resulting in total project costs from $80,000 to $250,000 depending on size, location, finishes, and service level.
• What starts as a quiet home office today can become a guest suite tomorrow or a rental unit during retirement.
• The first step is to schedule a free consultation with us so we can learn more about your goals for the project and answer any questions you have.
• This means we design ADU foundations that prevent future structural issues for your ADU.
• This isn’t a stack of materials, and it’s not a pre-built box.
• Our favorite option that most banks offer is Home Equity Lines of Credit [or a HELOC].
• JADUs are California’s most affordable ADU option — starting around $85,000 — and have the fastest permit timelines.
• Every ADU project starts with understanding your property and your goals.
• Our team assesses your lot for compatibility and works directly with local zoning departments to secure all necessary approvals and help you navigate the permit process.
• A Garage Conversion takes an existing garage structure and makes it into a permitted living space.
• One of the toughest goals to accomplish when building anything is dealing with the city regulations.

Pinnacle ADU Builder offers a perfect solution by adding extra bedrooms, a home office, or a guest suite—helping you avoid the hassle of relocating and increasing your property’s value. Whether you need a detached ADU, garage conversion, or basement apartment, we deliver tailored solutions that maximize your property’s potential. We build ADUs that meet local requirements, make efficient use of space, and are built to last. Our focus is on getting the details right from start to finish. The ADU Pro® serves homeowners across Orange County, Los Angeles County, Riverside County, San Bernardino County, and San Diego County. Our crews are local — we know your city’s building department, permit process, and zoning rules inside and out.

ADUs provide a source of income, funding savings, retirement, or other investments. Enter your address to see where Eastern ADU can build an ADU on your property. State law now gives most Southern California homeowners the right to build. No commitment — just an accurate cost breakdown for your property. Feel free to give us a call today so we can get started with your one of a kind ADU construction. From Los Angeles to the surrounding communities, we bring the same level of care and craftsmanship to every job — whether it’s a quick repair or a full project.

ADUs or Accessory Dwelling Units are the most in-demand construction projects of 2022. As a leading ADU construction company, we offer end-to-end services. This includes the design, plans, permits, build, and lastly the final sign-off by the city. While the average amount of living space per person continues to grow in the U.S., there is a growing interest among property owners and residents in many communities in micro housing. ADU Permitting in Los Angeles involves preparing and submitting all the necessary architectural, structural, and site plans to the Los Angeles Department of Building and Safety (LADBS) for approval. This ADU Permitting process makes sure your ADU construction is fully compliant with the local zoning codes and also with the building safety standards in Los Angeles.

• Eachmodel is stick built on site and pre-engineered to meet local building codes, ensuring a faster path from permitting to passive income.
• We consider factors such as space efficiency, aesthetics, and budget, ensuring a design that maximizes both style and function.
• These ingenious ADU kits come with all the instructions handy adults need to put them together.
• For the most accurate estimate for your Tennessee property, we encourage you to connect with our team.
• We’ll also take a look at your property to see if it meets the criteria for building an ADU in Los Angeles.
• Customers have the option to buy shell-package kits, order according to their own plans, or get the company to do it all for them.
• Wilmington ADU is committed to your success as a short-term rental (STR) owner.
• I’ve had the pleasure of getting to know Gil Vaisman and the Go ADU Construction team, and I can confidently say they represent the very best of what you’d hope to find in a Los Angeles ADU builder.
• Explore our  Portfolio  for inspiration and examples of finished projects.
• The tiniest unit they sell as a kit is just 140 square feet (13 square meters) in size.
• As you narrow down your options, it’s essential to look beyond just the headline price.
• In some others, state laws pre-empt some aspects of local zoning for ADUs or actively encourage cities and counties to adopt permissive zoning regulations for ADUs.
• We are one of the few builders in Southern California to offer in house financing for your ADU Project.

Their models are built with sustainability in mind and come fully equipped with solar systems and modern amenities. Samara markets itself as a turnkey experience with an emphasis on high-quality construction and thoughtful design. Everything California homeowners need to know about Accessory Dwelling Units in one comprehensive guide. Under California state laws including AB 68, AB 881, SB 9, SB 1211, and AB 2533, the City of LA must approve most ADU applications ministerially, meaning faster approvals with fewer obstacles. Most LA homeowners have enough equity to fund their entire ADU project.

A provider with experience in the region can help avoid unnecessary costs and delays by anticipating potential roadblocks. Local ADU builders often have stronger relationships with city departments, inspectors, and subcontractors, helping your project move smoothly from start to finish. Accessory dwelling units (ADUs) have emerged as a practical solution to California’s ongoing housing challenges. Homeowners in San Diego and across the state of California are turning to ADUs as a way to provide flexible living space for their family, generate rental income, and increase property value. Whether detached, attached, or integrated into the primary home, ADUs offer a cost-effective path to expand living options on residential properties. A Junior ADU (JADU) involves taking space already inside your single-family home in Los Angeles and turning it into a separate living unit.

Further, in the article, we will compare in what way hiring a team is a better form of building a unit. A tiny house gives you access to do everything you want with it. On the Internet, you can find many articles concerning the ways of using it, and one of the most popular ones is finding tenants. It lets you use an accessory dwelling unit as a rental unit and gives an option to fill the family budget. ADU rental income in Southern California ranges from $1,500–$4,000 per month depending on location, size, and finishes. A well-located ADU in Irvine or Newport Beach can earn $2,500–$4,000/month.

The common threads are size limits relative to the primary home, setback standards, parking provisions, and owner-occupancy conditions. If you’re planning an ADU, your first stop should be your local planning department, not a generalized checklist. Yes, Georgia generally permits ADUs, but auxillary dwelling units approval and specific rules vary by city and zoning district, as regulations are controlled at the local level. After move-in, your backyard home is backed by a warranty, so you can enjoy peace of mind for years to come. Livable square footage is the primary driver of real estate value.

They’re a great way to maximize your property’s potential, especially on a smaller lot. This guide will dive into everything you need to know about stacked ADUs,… We’ll assess your property, discuss your goals, and provide a detailed estimate – all at no cost. Complete breakdown of garage conversion ADU costs in Los Angeles for 2026. Single-car ($80K-$120K), two-car ($100K-$160K), and three-car ($140K-$200K) … Our most trusted resources to help you navigate ADU costs, regulations, and design decisions across California and beyond.

From Los Angeles County to Orange County, we ensure a smooth and efficient ADU construction process, turning your vision into reality while helping you maximize your property’s potential. Pinnacle ADU Builders is a trusted name in California, offering tailored solutions to homeowners, investors, and professionals. The ADU Pro® (CSLB # ) is the #1 rated ADU contractor in Orange County. Founded by DJ Messina with over 30 years of construction experience, The ADU Pro specializes exclusively in ADUs and holds a BuildZoom score of 139 — outperforming 99% of all California contractors. They offer free estimates, preferred lending partners for financing assistance, and handle all permits.

If you saw the prices for property in San Francisco, you will be pleased to know that the amount of money needed to create our topical property doesn’t reach these numbers. For sure, it still takes some resources and quite a sum of money for families to start the building process of a unit, but to have it completed, you don’t need to sell your soul. We helped a real estate investor convert a backyard into a detached ADU, turning unused space into a lucrative rental unit and increasing the property’s value significantly. With years of experience, we specialize in creating custom ADUs that meet zoning regulations, optimize space, and complement your property’s style.