| Burley Design & Construction | Brian Arthur Burley | — | (510) 912 6325 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Burlingame Heating And Ventilation INC | Douglass Michael Ulrich | — | (650) 697 9142 | HVAC | Hayward · Alameda County | — | — |
| Burnett Finish Carpentry | Burnett Finish Carpentry | — | (925) 858 0848 | Other | Dublin · Alameda County | — | — |
| Busk Brothers Tile | Busk Brothers Tile | — | (510) 395 6869 | Other | Oakland · Alameda County | — | — |
| Bustamante Concrete | Bustamante Concrete | — | (510) 719 3344 | Other | Livermore · Alameda County | — | — |
| Bustos Construction | Bustos Carlos | — | (510) 566 5254 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Buzatu Construction | Buzatu Dorin | — | (510) 847 3815 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bv Mechanical Services LLC | Byron Noe Velasquez | — | (510) 228 8601 | HVAC | Oakland · Alameda County | — | — |
| Bvts INC | Neville Trexler Donovan | — | (925) 449 1203 | Tree | Livermore · Alameda County | — | — |
| Bw Home Renovations LLC | Brent Stephen Whalley | — | (510) 304 5868 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| By Design Painting And Decorating | By Design Painting And Decorating | — | (510) 882 0804 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Byte Bridge Construction Services | Albert Dell Robison | — | (510) 373 8899 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| C & C Building Automation Company INC | Charles Michael Chavez | — | (650) 292 7450 | Electricians | Hayward · Alameda County | — | — |
| C & C Const | C & C Const | — | (510) 632 7470 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| C & C Electric INC | Chun Yin Lui | — | (510) 325 3724 | Electricians | Oakland · Alameda County | — | — |
| C & J Construction | Charles James Jr Benavidez | — | (510) 861 8079 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| C & T Construction | Charles Arthur Husk | — | (510) 928 6360 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| C A M Electric | Craig William Osborne | craigm@camelectric.com | (510) 714 7862 | Electricians | Castro Valley · Alameda County | — | — |
| C A Pacific Safety INC | Carlos Eduardo Aguirre Sazo | capacificinc@gmail.com | (510) 809 7384 | Other | San Leandro · Alameda County | — | — |
| C B Home Improvements | C B Home Improvements | cbhomes42@gmail.com | (510) 755 1653 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| C D Co LLC | Darrel James Wood | — | (510) 497 1665 | Other | Fremont · Alameda County | — | — |
| C E R Construction | Wong Dazhi | — | (510) 213 4023 | Electricians | Alameda · Alameda County | — | — |
| C Electric | Choy Phanixay | service@c-electric.com | (415) 845 3362 | Electricians | San Leandro · Alameda County | — | — |
| C Flanders Construction | Christopher Francis Flanders | — | (925) 575 1650 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| C George Construction | Christopher Todd George | cgeorgeconstruction@comcast.net | (510) 453 5334 | GC, remodel, ADU | Newark · Alameda County | — | — |
| C H M Mechanical INC | Kurt John Hugger | — | (650) 637 1274 | HVAC | Hayward · Alameda County | — | — |
| C H Original Builds | C H Original Builds | — | (917) 449 1225 | GC, remodel, ADU | Albany · Alameda County | — | — |
| C I C Company | Gerhardt Vitali | — | (925) 446 7088 | Other | Castro Valley · Alameda County | — | — |
| C J Builders | C J Builders | — | (510) 706 3170 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| C K Electric Co | Sang Ik Cha | — | (510) 427 8862 | Electricians | San Leandro · Alameda County | — | — |
| C L C Tile | C L C Tile | — | (510) 390 2483 | Other | Hayward · Alameda County | — | — |
| C L P Landscaping INC | Christopher Lee Paynter | clplandscaping@yahoo.com | (925) 980 9909 | Windows, patio, painters | Livermore · Alameda County | — | — |
| C M A Painting INC | Iakovou Marios | craig.dube@cmapainting.com | (415) 240 2930 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| C M Electric | Christopher Michael Martinez | reception@cmelectric.com | (925) 783 6845 | Electricians | Livermore · Alameda County | — | — |
| C Naefke Woodworking | C Naefke Woodworking | — | (510) 600 5870 | Other | Oakland · Alameda County | — | — |
| C P Caspersen Construction Corporation | Clifton Paul Caspersen | cpcaspersen3@gmail.com | (925) 426 6848 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| C P Gibson Enterprises INC DBA Central Petroleum Maintenance | Amir Ashgan Tarbyatjoui | — | (925) 462 4060 | Other | Pleasanton · Alameda County | — | — |
| C P S Signs | William Burt Gifford | — | (510) 793 2471 | Other | Newark · Alameda County | — | — |
| C R F Builders INC | Jose Rico | — | (209) 456 1865 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| C R Hunt Building & Design INC | Craig Richard Hunt | — | (510) 910 2213 | GC, remodel, ADU | Oakland · Alameda County | — | — |