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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Valley Home Builders Inc. is a Silicon Valley design-build contractor serving Santa Clara & San Mateo Counties. Founded in 2005, they specialize in kitchen remodeling, ADU construction, and home renovations across San Jose, San Mateo & bey... read more
RWB Construction is a Lafayette, CA-based ADU contractor serving the Bay Area. They build detached ADUs, garage conversions, granny flats & in-law suites, managing design, permitting, and construction from start to finish.
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Green Bay Remodeling offers ADU construction in Palo Alto, CA, including detached units, garage conversions, basement units & JADUs. ADUs boost property value, generate rental income & support multigenerational living.
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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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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.
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PCI Construction Inc is a trusted ADU contractor offering custom accessory dwelling units, garage conversions, granny flats, and in-law suites. Licensed, bonded, and insured, they handle permitting, design, and construction efficiently.
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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 communitie... read more
Edri Construction, Inc. is a San Francisco-based ADU contractor offering full-service accessory dwelling unit construction across the Bay Area, including garage conversions, detached ADUs, granny flats, and energy-efficient home additions with in-... read more
Are you considering adding an Accessory Dwelling Unit (ADU) to your property in Napa Valley, California? At Vino Design Build, we specialize in helping homeowners like you design, plan, and construct ADUs that enhance your property’s value and f... read more
Custom ADU builders in Palo Alto, CA, specializing in granny flats, detached ADUs & backyard cottages. Personalized design, permitting, and full construction management for quality accessory dwelling units.
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New Avenue, Inc is a full-service design-build company serving the San Francisco Bay Area and Portland, OR since 2011. They specialize in ADUs, custom homes, renovations, additions, and Enclaves, managing design, permitting, and construction under... read more
AK Builders Inc is a White Salmon, WA contractor serving the Columbia River Gorge. They offer new home builds, remodels, ADU projects, and custom woodworking across Oregon and Washington.
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ENE Smarthome, Inc. is a Bay Area contractor offering home remodeling, ADU construction, smart home upgrades, and accessibility improvements. Services include garage conversions, granny flats, aging-in-place remodels, and SB9-compliant ADU project... read more
Nestadu is a full-service ADU builder offering custom site-built and prefab accessory dwelling units. Prefab models range from $115K–$317K. Custom builds start at $400/sq ft. Financing options include HELOCs, construction loans, and CA grants.read more
San 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.