DSA Architects designed an 850 sq. ft. second-floor ADU in Berkeley Hills for multi-generational living. Features 2 beds, 1 bath, open layout, Tilden Park views, roof deck, solar PV, heat pumps, and gray-water system.
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Urban Shore Builders offers full-service ADU design & construction, including garage conversions, detached units & additions. As a turnkey ADU contractor, they handle permits, design & build. Services include plumbing, electrical, HVAC & retaining walls.
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HDR Remodeling is a Bay Area Design Build firm since 1987, specializing in kitchen remodels, bathroom renovations, and home improvements across Oakland, Berkeley, Alameda, and the East Bay, backed by an experienced team of architects and designers.
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Dan Boyle Construction offers expert ADU construction in Santa Rosa & Sonoma County. With 30+ years experience, they handle site evaluation, permits, design & full builds for detached ADUs, granny flats & backyard cottages.
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prefabADU is a Bay Area ADU builder with 16+ years of experience offering affordable kits and plans from under $45K. With 12 state-approved plans valid across California, they simplify permits, design, and installation for homeowners.
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Haus+ is a Bay Area ADU builder offering turnkey accessory dwelling units for California homeowners. They handle design, permitting, and construction using a panelized hybrid method, with all-inclusive upfront pricing and in-house financing available.
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We Do Construction specializes in ADU garage conversions across the San Francisco Bay Area. Licensed and insured, they handle permitting, 3D planning, construction, and interior design, offering free estimates for homeowners.
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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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Green Living Builders LLC is a licensed, bonded Berkeley CA general contractor specializing in ADU construction, garage conversions, home remodels, and new builds across the East Bay. Diamond Certified with deep local expertise.
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DNM Architecture is a California-based firm specializing in ADU design and permitting. Their ADUxDNM program covers site analysis, design, permitting, and construction management, offering detached ADUs, garage conversions, and more.
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Urban Building Workshop is a full-service architecture firm in the Bay Area specializing in custom homes, remodels, and ADUs. Experts in Marin County, San Francisco, and Sonoma County permitting, they deliver efficient, light-filled designs.
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Todd Jersey Architecture (TJA) is a Berkeley-based sustainable design firm serving the SF Bay Area. Specializing in ADUs, remodels, new homes & historic preservation, TJA combines 30+ years of experience with a performance-driven, eco-conscious approach.
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Manzanita Design Build is an East Bay ADU contractor specializing in accessory dwelling units. Serving Berkeley, Oakland, Alameda & more. New ADU construction starts ~$300K, 5–8 month build time. Licensed (#1034108) & insured.
read moreSanta Rosa, the largest city in Sonoma County and the heart of California's renowned Wine Country, has become one of the most active markets for Accessory Dwelling Units (ADUs) in Northern California. Following the devastating 2017 Tubbs Fire, which destroyed thousands of homes, the city has actively embraced ADU development as a critical strategy to rebuild and expand its housing stock. ADU contractors in Santa Rosa play a vital role in helping homeowners add valuable living space while addressing the region's ongoing housing shortage.
Working with an experienced ADU contractor in Santa Rosa is essential because local regulations require careful navigation. Santa Rosa follows California state ADU law while also maintaining specific local guidelines. Key regulatory points include:
The City of Santa Rosa's Permit Sonoma office oversees building permits for ADU projects. Skilled ADU contractors in Santa Rosa are familiar with the city's streamlined ADU permit process, which was improved to encourage faster approvals. The city also offers pre-approved ADU plans that can significantly reduce design costs and approval timelines. Contractors must ensure compliance with the California Building Code, Title 24 energy efficiency standards, and local fire codes — all of which are especially stringent in Sonoma County's fire-prone areas.
Santa Rosa homeowners work with ADU contractors to build a variety of unit types suited to the city's diverse neighborhoods, from the historic Railroad Square district to newer suburban developments. The most common ADU types include:
Hiring a local ADU contractor in Santa Rosa means working with professionals who understand Sonoma County's specific soil conditions, seismic considerations, wildfire safety requirements, and neighborhood aesthetics. A knowledgeable contractor will guide you through design, permitting, construction, and final inspection — ensuring your ADU is built efficiently, legally, and to the highest standards. Whether you're looking to house family members, generate rental income, or increase your property value, a qualified Santa Rosa ADU contractor is your best partner in the process.