Wise Builders is a Bay Area ADU contractor with 20+ years of experience in accessory dwelling units, garage conversions, and attached or detached ADU construction across San Jose, Sunnyvale, and Silicon Valley. Free estimates available.
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TDK Construction is a licensed ADU contractor in Lodi, CA, with 10+ years of experience. They offer full design-and-build services for detached ADUs, garage conversions, JADUs, and granny flats, ensuring compliance with California ADU regulations.
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AKD Homes is a Bay Area ADU contractor with 20+ years of experience. They offer full-service ADU design and build, including detached ADUs, custom designs, and conversions from Berkeley to San Jose.
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ExpandADU is a California-based prefab ADU builder offering full-service accessory dwelling unit construction, including consultation, design, planning, and build. Serving the Bay Area and beyond, they specialize in detached ADUs, granny flats, and JADUs.
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Regency Construction & Remodeling BA is a San Francisco ADU contractor offering new builds, space conversions, and prefab ADU solutions. They handle design to completion, manage permits, and ensure compliance with local zoning laws.
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Type Five is a Berkeley, CA-based ADU builder offering custom backyard cottages, granny flats & in-law suites. They combine modular design, transparent pricing & streamlined construction for stress-free, high-quality detached ADUs built to last.
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CDU Inc. offers expert ADU construction & remodeling in the Greater Bay Area. Services include new builds, garage conversions, electrical, plumbing & custom design to boost property value & functionality.
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ADU Home Addition is a leading Bay Area ADU contractor with 12+ years of experience. They specialize in custom ADU construction, in-law suites, garage conversions, home additions, and rental-optimized ADUs, handling design, permits, and full construction.
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Bay Star Garage transforms garages into functional spaces in Santa Clara & Livermore, CA. Services include remodeling, flooring, EV charging, lighting, conversions & cabinets. Licensed, bonded & insured contractor specializing in ADUs and garage upgrades.
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ResCom ADU is a full-service ADU builder in Walnut Creek, CA, offering design, permits, engineering, construction & hookups. With 100+ years of combined experience, they deliver custom, cost-effective accessory dwelling units using SIPs & Net-Zero technology.
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OT Bay Builders is a complete remodeling company with over 40 years of combined experience amongst our team. We’re expert Bay Area ADU builders in San Jose with a customer-first mindset. As a full-service ADU builder, you can trust us to remain by your side from the first consultation to the final walkthrough.
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We are a family-first, boutique residential design & build firm serving the Orinda and East Bay community. We’re not just service providers — we’re your neighbors. We understand the local permitting process, the hillside terrain, the fire-hazard restrictions, and the thoughtful planning needed to create homes that truly work for East Bay families.
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Jeff Martinez Construction Inc. builds ADUs in Oakley, CA with 27+ years of experience. Services include detached ADUs, garage conversions, permits, finishing, and landscape integration across Contra Costa County.
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NorCal ADU Builders is a California-based full-service ADU contractor handling planning, permits, Title 24 compliance, and construction—including foundation, framing, roofing, plumbing, and interior finishes—for detached ADUs, garage conversions, and backyard cottages.
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Metricon Homes offers ADU construction and garage conversion services. Choose from 5 sizes: Marigold, Camellia, Magnolia, Dahlia, and Sunflower. Their Design to Doorstep process covers custom design to completion. Licensed contractor: Tobin Brinker, License #1128717.
read moreAntioch, California, situated at the eastern edge of Contra Costa County along the San Joaquin Delta, is one of the fastest-growing cities in the Bay Area. With its relatively affordable housing compared to neighboring cities like Walnut Creek or Concord, Antioch has become a prime location for homeowners looking to maximize their property value through Accessory Dwelling Units (ADUs). Experienced ADU contractors in Antioch understand the unique challenges of building in this region, including the area's expansive clay soils, which can significantly impact foundation requirements and overall construction costs.
Before breaking ground, ADU contractors in Antioch must navigate the city's specific zoning and permitting requirements. Antioch follows California state ADU law while also enforcing its own local guidelines through the Community Development Department. Key regulations homeowners and contractors should be aware of include:
Hiring a licensed ADU contractor familiar with Antioch is essential for a smooth construction process. Local contractors understand the city's plan check process, typical turnaround times, and the specific inspectors and departments involved. They are also well-versed in the soil conditions common to the Delta region, ensuring proper foundation design to prevent settling or structural issues over time. Additionally, local contractors often have established relationships with Antioch's utility providers, which is critical when coordinating new electrical, water, and sewer connections for your ADU.
Given Antioch's mix of older ranch-style homes and newer suburban developments, ADU contractors in the area frequently build a variety of unit types:
With Antioch's growing rental demand and rising property values, adding an ADU is one of the smartest investments a homeowner can make. Whether you're looking to generate rental income, house family members, or increase resale value, working with a qualified ADU contractor in Antioch, CA ensures your project meets all local codes and is completed efficiently. Always verify that your contractor holds a valid California contractor's license (CSLB) and carries proper insurance before starting any project.