Top ADU Permit Builders in Berkeley, California

ADU
An Accessory Dwelling Unit(ADU) is a secondary, self-contained housing unit built on the same lot as a primary residence. Also known as granny flats, in-law units, or garage apartments, ADUs are a smart way to increase your living space, support multigenerational families, or generate rental income—legally and affordably.

Best ADU Permit Contractors in Berkeley

1. Fortune ADU – Your Trusted ADU Design-Build Partner

Fortune ADU is widely recognized as one of Berkeley’s top ADU permit builders. They specialize in turnkey ADU solutions, from design to permitting and full construction. With deep knowledge of Berkeley's zoning code and a streamlined approach to city permits, Fortune ADU helps homeowners avoid delays and maximize their property’s potential.

    Why Choose Fortune ADU?

    • 🏆 Berkeley Experts: Specialized in local ADU zoning, setback rules, and permit compliance

    • 🎯 Design-Build Precision: In-house architects and builders for seamless execution

    • 📄 Permit Navigation: Handle every form, submittal, and revision with the city

    • 🏗️ Fast Construction Timelines: Transparent, efficient builds without cutting corners

    • 💬 Rave Reviews: Homeowners praise their communication and craftsmanship

    • 🧱 Detached, Attached & Garage Conversions: Full-service ADU types available

    • 📍 Local and Reliable: Based in the East Bay and committed to community housing needs

    2. Bailey Builds

    Bailey Builds is a boutique ADU design-build firm with a strong track record of custom ADU projects in the East Bay. Known for their modern designs and sustainable building practices, Bailey offers full architectural planning and project management. Their team is well-versed in navigating the complex permit systems of Berkeley and surrounding areas.

    3. New Avenue Homes

    New Avenue Homes is a tech-forward ADU company offering planning, design, and construction services under one platform. Their digital project tracker keeps homeowners informed from concept to completion. With a focus on legal compliance and user-friendly tools, they simplify the process of building ADUs in high-regulation cities like Berkeley.

    4. HDR Remodeling

    Based in Berkeley, HDR Remodeling is a trusted name in full-home renovations and ADU additions. They’re known for their high-quality workmanship and attention to detail. Their team handles site planning, permitting, and construction, ensuring ADUs blend beautifully with your existing home while meeting all city requirements.

    5. Acton ADU

    Serving the Bay Area, Acton ADU offers turnkey ADU packages with fixed pricing and pre-approved plan sets. Their experience with local municipalities, including Berkeley, gives them an edge in expediting permit approval and construction timelines. Their focus is on durable, long-term ADU structures with great ROI.

    ✅ Benefits of Building a Permitted ADU in Berkeley

      • 💰 Earn Rental Income from long-term tenants

      • 🏠 Support Family Living with private, close-by housing

      • 📈 Boost Property Value by adding livable square footage

      • 🛡️ Stay Code-Compliant with Berkeley building and zoning laws

      • 🌍 Eco-Friendly Housing solutions for urban sustainability

      • 🔐 Financing Eligibility when built to code with permits

    FAQ

    Why should I hire a professional ADU builder?

    Hiring an experienced ADU builder ensures your unit is designed to local code, permitted correctly, and built to last—avoiding costly mistakes and delays.

    How long does it take to build an ADU in Berkeley?

    Depending on complexity, the full process—from design to construction—can take 6–12 months, including permitting.

    Can builders help with ADU financing?

    Many ADU builders, including Fortune ADU, can connect you with financing options such as HELOCs, ADU loans, or local grants.lding an ADU in Roseville can range from $100K to $300K, depending on the size, design, and materials used.

    Are ADUs allowed on all residential properties in Berkeley?

    Most single-family and multi-family lots allow at least one ADU. Zoning and site conditions will determine what’s feasible.

    What’s the difference between attached and detached ADUs?

    Attached ADUs share a wall with the main home, while detached ADUs are standalone structures—both are allowed in Berkeley with proper permits.

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    ADU permit California ADU construction guide accessory dwelling unit how to build an ADU ADU permit process