The 10 ADU builders from Google's results for San Jose, California, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in California. California contractors need a CSLB license for most remodeling work. Check the license number and its bond on the CSLB site before you sign.
on GoogleSan Jose
In San Jose, Mayer's Construction builds accessory dwelling units, including garage conversions and detached guest houses. Design, permitting and construction are all handled in-house, so one company carries an ADU from early drawings through the finished build.
on GoogleSanta Clara, CA
Avis Builders and Design plans and builds detached ADUs, garage conversions and room additions in the Santa Clara area. Work starts with a property visit and lot review, then moves through permits and construction, often for families housing parents, adult children or tenants.
(408) 208-0551 2445 Augustine Dr #150, Santa Clara, CA 95054
on GoogleLos Angeles, CA
Revival ADU, operating as Revival Homes, focuses on accessory dwelling units in San Jose. The company guides homeowners through ADU planning and development, from early pricing and consultation through design and the city building permit stage.
(877) 560-5583 1150 S Olive St 9th Floor, Los Angeles, CA 90015
on GoogleSan Jose, CA
Spindola Construction handles siding and stucco repair and replacement on homes in San Jose and other South Bay cities, along with fixing dry rot and water-damaged exterior walls. Patches are color-matched to existing finishes, and full re-stucco jobs go over existing walls. The firm is also listed for ADU work.
(408) 389-2715 1649 Blossom Hill Rd, San Jose, CA 95124
on GoogleSanta Clara, CA
Valley Home Builders designs and builds custom homes, accessory dwelling units and home renovations throughout San Mateo and Santa Clara counties. Its portfolio covers kitchen and bathroom remodels, new builds, custom ADUs and pre-approved ADU plans, including projects in San Jose.
(408) 207-4918 3466 Edward Ave, Santa Clara, CA 95054
on GoogleBerkeley, CA
New Avenue Homes is a Berkeley-based ADU company whose South Bay work covers backyard accessory dwellings in Campbell, Los Gatos and San Jose. These units serve as rental space, guest houses, retirement homes or housing for relatives living nearby.
(855) 563-9283 2120 University Ave, Berkeley, CA 94704
San Jose
San Jose Garage Conversion turns existing garages into living space and builds ADUs, handling projects from start to finish. Its work reaches neighborhoods such as Willow Glen, Almaden Valley and Evergreen, where homeowners add rental units, in-law suites or extra room without moving.
San Jose
Red Shed builds accessory dwelling units, custom homes and backyard structures in San Jose, including home office sheds. Outdoor living projects such as custom decks, saunas and spas round out the work, with jobs in areas like Willow Glen and Almaden Valley.
San Jose
The ADU Dudes is an East Bay family-run company that coordinates ADUs, junior ADUs, home additions and remodels, with construction carried out by a partner contractor. Past builds span Livermore, Dublin, Alamo, Pleasanton, Concord, El Cerrito and Sacramento.
San Jose
Ataman Studio designs and builds accessory dwelling units in San Jose, CA, handling design, permitting and construction. Projects include detached backyard homes and conversions of detached garages, for rental income or multigenerational living.
In San Jose, a garage conversion ADU typically costs $77,000 – $192,000. Remodeling labor in San Jose runs about 28% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "adu builders san jose", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
It depends on your city and state. California, Oregon and Washington have state laws that make ADUs allowed on most single-family lots. Elsewhere it is set by local zoning, so check lot size, setback and owner-occupancy rules with your city first.