Harmony Design & Development builds custom ADUs across the San Francisco Bay Area, including detached units, garage conversions, and in-law suites. They manage permits, design, and construction from start to finish.
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Epic Modulars delivers fast, flexible, and customizable solutions for homes and ADUs. Their manufactured homes and ADUs are built in controlled factory environments, ensuring superior quality, faster timelines, and predictable costs.
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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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Bay Area general contractor Design and Construction by M&M specializes in ADUs, remodeling, room additions, and custom builds. Serving Burlingame, Los Altos, and Campbell, they manage design, permitting, and construction. Free consultations available.
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Wellmade is a California prefab ADU builder specializing in panelized accessory dwelling units. Founded in 2020, they've completed 200+ projects, reducing construction waste by 85%. Serving CA, OR, and WA with all-inclusive pricing.
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Bayside Builders Group is a licensed Bay Area ADU contractor with 25+ years of experience. Services include detached ADUs, garage conversions, and in-law suites. Serving Oakland, San Jose, San Francisco, and surrounding counties.
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LRL Builders, Inc. is a licensed ADU contractor in Walnut Creek, CA, specializing in detached, attached, garage conversion, and junior ADUs. They handle design, permitting, and construction, serving Walnut Creek and surrounding Bay Area communities.
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YCD Studio is a Bay Area architecture firm specializing in ADU design and permits in Moraga and the Lamorinda area. Services include detached ADUs, garage conversions, and JADUs, with expertise in WUI standards and local fire district requirements.
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Acton ADU is a Bay Area ADU contractor founded by Stan Acton with 30+ years of experience. They offer full-service ADU design, construction, garage conversions, and permitting across San Jose and the broader Bay Area.
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Northbay Home Solutions offers full-service ADU construction in San Rafael, San Francisco & North Bay. Services include detached ADUs, garage conversions & JADUs, covering design, permits & build.
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King David Construction is a Palo Alto ADU contractor offering full-service design, permitting & construction across the Bay Area. Specializing in detached ADUs, garage conversions & in-law suites.
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GADI Construction, led by Nadav, specializes in ADU construction, home expansions, garage conversions & granny flats. Known for detailed planning, clear communication & professional client guidance throughout every project phase.
read moreSan Lorenzo is a census-designated place (CDP) in Alameda County, California, meaning it is an unincorporated community without its own city government. This is a critical distinction for homeowners seeking ADU contractors in San Lorenzo, as all permitting, zoning, and building regulations fall under Alameda County's jurisdiction rather than a standalone city authority. Working with experienced ADU contractors who understand Alameda County's specific rules is essential for a smooth and compliant construction process.
Because San Lorenzo falls under Alameda County's unincorporated zoning codes, ADU contractors must navigate the county's Planning Department and Building Services Division. Key regulations that your ADU contractor must be familiar with include:
San Lorenzo's neighborhoods consist largely of post-World War II single-family homes, many built in the late 1940s and 1950s as part of planned suburban development. This means ADU contractors frequently encounter older infrastructure, including aging electrical panels, outdated plumbing, and foundations that may require upgrades before an ADU can be permitted. Hiring a knowledgeable local ADU contractor ensures these challenges are identified early, keeping your project on budget and on schedule.
Given the typical lot sizes and home layouts found throughout San Lorenzo, the most common ADU types constructed by local contractors include:
Whether you're looking to add rental income, house extended family, or increase your property value, working with a qualified ADU contractor in San Lorenzo, CA is the first step. Make sure your contractor has direct experience with Alameda County permitting processes to ensure your project meets all local requirements efficiently and effectively.