| Big Bay Plastering Inc | B + C35 | 2015 | Active |
| Birnam Wood Builders | B | 2021 | Active |
| Blach Construction Company | A, B | 1974 | Active |
| Blach+cahill Joint Venture | A, B | 2018 | Active |
| Black Bear Builders Inc | B | 2012 | Active |
| Black Diamond Paver Stones & Landscape Inc | B + C27 | 2004 | Active |
| Blackstone Construction And Remodeling | B | 2026 | Active |
| Blackstone General Contruction Inc | B | 2024 | Active |
| Blackwell General Engineering Inc | A | 1980 | Active |
| Blackwood Construction Co | B + C10, C36 | 2026 | Active |
| Blaettler Construction Inc A California Corporation | B | 1989 | Active |
| Bloom Energy Corporation | A, B | 2011 | Active |
| Bloom Home Construction Inc | A, B | 2023 | Active |
| Blossom Valley Construction Inc | A, B + C27, D12, D34 | 1985 | Active |
| Blue Custom Painting Inc | B + C33 | 2017 | Active |
| Blue Dream Construction Inc | B | 2025 | Active |
| Blue Sierra Concrete Construction | A, B + C27 | 2005 | Active |
| Blues Brothers Construction Inc | B | 2019 | Active |
| Boa Design Corporation | B | 2025 | Active |
| Boha Builders Inc | B | 2023 | Active |
| Bond Pavement Solutions Inc | A + C32 | 2004 | Active |
| Bonilla Builders Inc | B + C27 | 2004 | Active |
| Bosco Construction Services Inc | A, B + C8, C13, C15 +1 | 2010 | Active |
| Botad Construction Corporation | B | 2016 | Active |
| Box Crib Inc | B | 2023 | Active |
| Bradley Aaron Construction Repair And Remodeling | B + C33 | 1994 | Active |
| Brajan Construction Inc | B + C36 | 2012 | Active |
| Bressani Construction | A | 1982 | Renew by Nov 30, 2026 |
| Briarwood Property Management | B | 2017 | Active |
| Brightway Builders Inc | B | 2025 | Active |
| Brilliant Construction Company LLC | B | 2021 | Active |
| Brilliant General Maintenance Inc | B + C20, C27 | 2010 | Active |
| Briscoe Construction Inc | B | 2017 | Active |
| Brook Construction Management LLC | B | 2017 | Active |
| Brother And Brother Builders | B | 2006 | Renew by Nov 30, 2026 |
| Brown Bill Construction Company | A, B + C8, C21, C51 | 1994 | Active |
| Brushbuilders Inc | B | 2019 | Active |
| Buccaneer Demolition Inc | B + ASB, C21 | 2004 | Active |
| Bui Long Handyman Services Incorporation | B | 2023 | Active |
| Build By Titan Inc | B + C54 | 2010 | Active |
| Build The Bay Inc | B | 2020 | Active |
| Builden Group Inc | A, B | 2020 | Active |
| Builder Up Inc | B | 2020 | Active |
| Building & Beyond Inc | B | 1995 | Active |
| Building Works The | B | 1983 | Active |
| Buildmeta Corporation | B | 2022 | Active |
| Builtech Construction Group Inc | A, B + C8 | 2021 | Active |
| Bukazoo Inc | B + C20, C36 | 2015 | Active |
| Burnham-Construction Inc | B | 2000 | Active |
| Burr Plumbing And Pumping Inc | A + C10, C36, D21 | 1996 | Renew by Dec 31, 2026 |
| BWB Builders Inc | B | 2015 | Active |
| C & A Painting And Construction | B + C33 | 1996 | Active |
| C & J Contracting Inc | B + C20, C33 | 1984 | Renew by Dec 31, 2026 |
| C & S Painting Inc | B + C33 | 2001 | Active |
| C A G E Design Build Inc | B | 2009 | Active |
| C Bates Inc | B | 2025 | Active |
| C C I Construction Inc | B | 2009 | Active |
| C K L Construction Inc | B | 1984 | Active |
| C N E Construction Incorporation | B | 2016 | Active |
| C Pizzo Construction Inc | B | 2000 | Active |
| C V A Builders Inc | B | 2017 | Active |
| Cabinet & Stone Expo Inc | B | 2013 | Active |
| Cabral Contractors Group Inc | B | 2024 | Renew by Nov 30, 2026 |
| Cabral R Contractor Inc | B | 2009 | Active |
| Cabrillo Construction | B | 2022 | Active |
| Cal - Vet Construction Services | B + C13, C31, C32 | 2007 | Active |
| Cal Brothers General Contractor | A, B + C10 | 2026 | Active |
| Cal Green Remodeling Inc | B + C17 | 2019 | Active |
| Cal Sign Inc | B + C10, C45 | 2025 | Active |
| Cal Solid Chain Construction Company | B | 2021 | Active |
| Cal-Ling Construction | B | 2017 | Active |
| Cali Frank S Construction Inc | B | 1986 | Active |
| California Bay Builders And Remodeling | B | 2024 | Renew by Dec 31, 2026 |
| California Build Inc | B | 2023 | Active |
| California Caissons & Shoring Inc | B + D09, D30 | 2003 | Active |
| California Construction Bay Area Inc | B | 2018 | Active |
| California Construction Center Inc | B | 2007 | Active |
| California Drywall Co | B + C2, C9, C33 +1 | 1954 | Active |
| California Home Builders & Design Inc | B | 2006 | Active |
| California Home Repairs & Services Inc | B + C47 | 2014 | Active |
| California Quality Builders | B | 2025 | Active |
| California Water Service Company | A | 2000 | Active |
| Calvin Construction Inc | B + C10 | 2016 | Active |
| Calwestern Property Management Painting Dept | B + C33 | 1997 | Active |
| Cambrian Construction Inc | B | 2018 | Active |
| Camila Construction Demolition | A + C21 | 2022 | Active |
| Campbell Bay Electric Inc | B + C10 | 2022 | Active |
| Campisi Construction Inc | B | 1991 | Active |
| Canaan Builders Inc | B | 2014 | Active |
| Capticon JV | B + C10 | 2024 | Active |
| Capuni Construction | B | 2024 | Active |
| Cardenas Custom Homes Inc | B | 2021 | Active |
| Carus Group America Inc | B + ASB, C15, C46 +1 | 2025 | Active |
| Casa Lyon Remodeling Inc | B2 | 2023 | Active |
| Catmex Roofing Inc | B | 2025 | Active |
| Cazares Construction Inc | B | 2022 | Active |
| CCM California Contractors Management | B + C54 | 2018 | Active |
| CDL 88 Construction Corp | B | 2023 | Active |
| Ceeb Construction Inc | B | 2000 | Active |
| Celtic Construction LLC | B | 1992 | Active |