Eureka Modular builds steel frame modular ADUs and single family homes. Steel framing offers durability, design flexibility, and sustainability. Ideal for detached ADUs, backyard cottages, granny flats, and casitas with efficient, precise construction.

ADU Builders Bay Area

111 N Market St Suite 1150, San Jose, CA 95113

ADU Builders Bay Area specializes in detached ADUs, garage conversions, in-law suites & more. Expert ADU contractors offering transparent pricing, full permitting & quality construction throughout the Bay Area.

Home Remodel Bakersfield

2800 Buck Owens Boulevard, Bakersfield, CA 93308

Home Remodel Bakersfield is a licensed ADU contractor in Bakersfield, CA, offering detached ADUs, garage conversions, JADUs, and home remodeling. Projects typically complete in 8–12 weeks with free consultations and itemized estimates.

Next Level ADU Builders

8520 Florence Avenue, Downey, CA 90240

Next Level ADU Builders, serving Los Angeles, Riverside & Pico Rivera since 1997, specializes in ADU construction—detached units, granny flats & casitas—plus HVAC, remodeling & roofing, with financing options available.

ADUXprt IE General Builders

4534 Carter Court, Chino, CA 91710

Our Expert Team offers dependable expert services on short notice because of our extensive network of employees and sub-contractors located throughout California. Our teams of respectable employees are always willing to help accommodate our customer’s needs, by going the extra mile, especially when it comes to meeting those critical deadlines.

San Francisco ADU Solutions

967 Connecticut Street, San Francisco, CA 94107

ADUs (accessory dwelling units) are self-contained homes on existing properties. California's 2020 laws simplified ADU permits statewide. Alpha ADU Solutions, a San Francisco-based ADU builder with 100+ team members, specializes in granny flats, garage conversions & in-law suites.

SFBay ADU

111 North Market Street, San Jose, CA 95113

Licensed

SFBay ADU is a Bay Area ADU contractor offering full-service design, permitting, and construction. Specializing in 600–1,200 sq ft units, they offer studio, 2-bed, garden cottage, and in-law suite options, with projects completed in as little as 6 months.

Orange Innovation

4949 Bilmoor Avenue, Tarzana, CA 91356

Orange Innovation Inc is an ADU builder offering full-service design, engineering, and construction. Specializing in detached ADUs, granny flats, and in-law suites, they manage projects from concept to completion with a focus on budget and timeline.

Bevyhouse

2215 Palma Dr, Ventura, CA 93023

Our turn-key design and construction process connects your directly with our talented team of designers and engineers and puts the control of customizing your project directly at your fingertips. We’ll develop awesome designs and work with you every step of the way until your custom project comes to completion.

TrueBuild ADU

4901 70th Street, San Diego, CA 92115

TrueBuild ADU is an owner-operated ADU builder serving San Diego County, offering detached ADUs, garage conversions, and JADUs. Known for transparent pricing and hands-on service, they deliver quality construction without corporate markups.

Cozy ADU

Citrus Heights, CA 95610

Cozy ADU is a full-service ADU contractor in Greater Sacramento, CA, building detached ADUs, garage conversions, guest houses & more. Turnkey process from permits to construction. Free consultation available.

ADU Cities

1420 East Katella Avenue, Anaheim, CA 92867

ADU Cities is a California design-build firm specializing in ADUs, JADUs, garage conversions, and remodels. They manage design, permitting, and construction, helping homeowners add living space, boost property value, or generate rental income.

LADU

127 Broadway, Santa Monica, CA 90401

LADU is a full-service ADU builder in Los Angeles managing design, permits, and construction end-to-end. Serving LA, Orange, San Diego & more counties, they offer custom and prefab ADUs with transparent pricing and free on-site evaluations.

Foothill Renovators

2541 Charford Street, Glendora, CA 91740

Foothill Renovators offers home remodeling, ADU construction, new builds, and additions. Services include flooring, roofing, electrical, plumbing, and more. They handle permits and full project management for detached ADUs, granny flats, and garage conversions.

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Other cities in California

What you need to know

ADU Contractors in California: Navigating the Golden State's Unique Landscape

California is at the forefront of the Accessory Dwelling Unit (ADU) movement in the United States. With one of the most severe housing shortages in the nation, the state has enacted sweeping legislation to make ADU construction more accessible. Since 2020, California laws such as AB 68, AB 881, and SB 13 have significantly reduced barriers, eliminating minimum lot size requirements, reducing setback rules, and streamlining the permitting process. For homeowners looking to add value to their property or create additional rental income, working with experienced ADU contractors in California has never been more important.

What California ADU Contractors Must Know About State Regulations

Professional ADU contractors operating in California must stay current with a constantly evolving regulatory environment. Under California law, local agencies are required to approve or deny ADU permit applications within 60 days. Additionally, ADUs under 800 square feet cannot be denied solely based on floor area ratio limits. Contractors must also be familiar with owner-occupancy rules, utility connection requirements, and fire safety standards that vary by county and municipality. Cities like Los Angeles, San Diego, and San Jose each have their own local ordinances layered on top of state law, making local expertise a critical asset.

Types of ADUs Built by California Contractors

Experienced California ADU contractors are skilled in building a wide variety of ADU types to suit different property configurations and homeowner needs. The most common types include:

Detached ADUs: Standalone structures built in the backyard or side yard of a primary residence.
Attached ADUs: Units that share a wall with the main home, often built as additions.
Garage Conversions: Transforming existing garages into livable spaces, a popular and cost-effective option.
Junior ADUs (JADUs): Units up to 500 square feet created within the existing footprint of a home.

How to Choose the Right ADU Contractor in California

Selecting the right contractor is one of the most critical decisions in any ADU project. Homeowners should look for contractors who hold a valid California Contractors State License Board (CSLB) license, ideally a Class B General Building Contractor license. It is also important to verify that the contractor carries proper liability insurance and workers' compensation coverage. Look for professionals with a proven track record of successfully permitted ADU projects in your specific city or county.

The Benefits of Building an ADU in California

Building an ADU in California offers significant financial and lifestyle benefits. Homeowners can generate rental income to offset mortgage costs, house family members, or increase overall property value. In high-cost markets like the San Francisco Bay Area or Los Angeles, a well-built ADU can add hundreds of thousands of dollars in property value. With the right California ADU contractor by your side, the process can be smooth, compliant, and highly rewarding.

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