Greyhawk Construction offers full-service ADU construction, including garage conversions, detached backyard cottages, granny flats, and in-law suites. They manage design, permitting, and build, helping homeowners add value and flexible living space.
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Raudes Construction builds ADUs including garage conversions, granny flats & detached units. They handle permits, zoning compliance & full construction. Costs range from $50K to $300K+, with timelines of 3–6 months.
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ERE Construction (CSLB# 1006497) specializes in ADU building services in the Merced & Yosemite region, offering garage conversions, detached ADU builds, attached additions & in-law suites, all code-compliant.
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Colibri Kitchen & Bath offers full-service ADU construction in Oakland, handling design, permitting, and building. Services include site assessment, architectural plans, 3D renderings, and complete construction from foundation to finishing.
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Full Circle Builders offers custom ADU construction in Riverside County & the Inland Empire. Detached ADUs start at $185,000 (590 sq ft, 1BD/1BA). Container homes also available. Turn-key builds, permitting assistance included.
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Southland Remodeling is a Los Angeles ADU contractor offering detached ADUs, garage conversions, and room additions. With 20+ years experience, they handle design, permits, and construction across LA and San Fernando Valley.
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LA Family Builders is a California general contractor specializing in ADU construction across Los Angeles. Services include detached ADUs, garage conversions, granny flats, JADUs, and casitas, covering Beverly Hills, Pasadena, Malibu, and more.
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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.
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American Helical (CA LIC #1128975) is a full-service ADU contractor in California offering planning, design, permitting, and construction. A 3rd-generation builder, they provide pre-designed models, custom ADUs, and prefab installs across multiple counties.
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Eco Grizzly is a licensed Southern California ADU contractor (CSLB #1077111) building detached ADUs, garage conversions, JADUs, and above-garage units. They handle permits, architectural plans, and full construction across LA, Ventura, Orange, and Riverside counties.
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Excellent Home Remodeling offers professional home addition services in Sonoma, helping homeowners expand living spaces, add bedrooms, bathrooms, home offices, or in-law suites. They handle planning and execution tailored to each property's needs.
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New Birth Builders believes that a room addition or Garage Conversion is a great way to increase your home’s value and this new space can be used in a variety of ways. For most homeowners adding a room is less cost efficient and stressful than having to sell their home and move to a bigger home.
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Flip It Homes Inc. is a Southern California ADU builder with 10+ years of experience in garage conversions, new construction ADUs, and home renovations across Los Angeles, San Fernando Valley, and surrounding communities.
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Built Environment Inc. is a licensed Northern California ADU contractor with 20+ years of experience. They build detached, attached, internal, JADU, and garage conversion ADUs, guiding homeowners from consultation to completion per California building codes.
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John Christopher Construction is a Southern California general contractor specializing in ADU design and building. Serving Huntington Beach, Newport Beach, Costa Mesa & more, they offer custom and pre-engineered ADU plans for rental units, in-law suites & more.
read moreCalifornia 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.
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.
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:
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.
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.