| Bay Area Power Electric | Miguel Orlando Aguilar Landaverde | bayareapowerelectric@gmail.com | (510) 963 8172 | Electricians | Fremont · Alameda County | — | — |
| Bay Area Property Management | Bay Area Property Management | — | (415) 940-9653 | Property managers | Alameda · Alameda County | — | — |
| Bay Area Racking Solutions | Jose Monter Bravo | bayarearackingsolutions@gmail.com | (510) 695 6535 | Other | San Leandro · Alameda County | — | — |
| Bay Area Remodeling INC | Rafael Antonio Perez Sarceno | — | (510) 472 1814 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bay Area Retrofit | Howard Van Winkle Cook | — | (510) 548 1111 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Bay Area Roofing Master INC | Chavez Julio | — | (510) 373 3161 | Other roofers | Union City · Alameda County | — | — |
| Bay Area Security Solutions | Blaine Stanley Lucas | — | (510) 278 2583 | Alarm and generators | Hayward · Alameda County | — | — |
| Bay Area Security Specialists INC | Roger Alan Williford | bass371@comcast.net | (925) 371 2277 | Electricians | Livermore · Alameda County | — | — |
| Bay Area Sign Installation Company | Secundino Tovar Sandoval | — | (510) 277 5370 | Other | San Leandro · Alameda County | — | — |
| Bay Area Sound & Security | Douglas Edward Wybenga | — | (866) 233 5823 | Electricians | Pleasanton · Alameda County | — | — |
| Bay Area Sound Access | Bay Area Sound Access | — | (510) 325 8235 | Other | Oakland · Alameda County | — | — |
| Bay Area Sprinkler & Landscape LLC | Jeremy James Goodwin | — | (415) 505 6155 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Bay Area Tile | Bay Area Tile | — | (925) 373 1055 | Other | Livermore · Alameda County | — | — |
| Bay Area Waterproofing INC | John Machado Iii Lawrence | — | (408) 854 1038 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Bay Area Yard Works | Bay Area Yard Works | — | (510) 774 0297 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Bay Bear Construction INC | Lee Chun Hung | — | (510) 759 6916 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Bay Bejar Plumbing | Bay Bejar Plumbing | — | (650) 921 2276 | Other | Hayward · Alameda County | — | — |
| Bay Bridge Electrical Services INC | Rashad Jamal Marsh | — | (786) 414 7307 | Electricians | Oakland · Alameda County | — | — |
| Bay Building Structures INC | Gerardo Moran | — | (408) 422 7197 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bay Cal Windows And Glass Doors | Julio Cesar Rodriguez | — | (510) 362 1989 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Bay Cities Builders | Bay Cities Builders | — | (650) 218 3001 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bay Cities Construction INC | Willie Zee | — | (510) 219 1151 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bay Cities Painting INC | Jose Mariano Valle | — | (510) 881 0111 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Bay Cities Pyrotector INC | Lloyd Thomas Ernst | — | (510) 450 7760 | Electricians | Emeryville · Alameda County | — | — |
| Bay City Boiler Company | Kristie L Ellery | — | (510) 786 3711 | HVAC | Hayward · Alameda County | — | — |
| Bay Construction Clean Up | Julio Cesar Cordova | — | (510) 265 9417 | Other | Oakland · Alameda County | — | — |
| Bay Custom Countertops INC | Francesco Giuliano Pierinelli | baycustomcountertops@yahoo.com | (510) 565 1567 | Other | Newark · Alameda County | — | — |
| Bay Design & Build INC | Brian Mc Kewen Hebert | — | (510) 594 6884 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Bay Design Electric | Chen Jianqiang | — | (510) 875 9324 | Electricians | Castro Valley · Alameda County | — | — |
| Bay Easy Construction INC | Gabay Ofer | customercare@bayeasyconstruction.com | (925) 718-1054 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bay Electric Co | Hyun Sun Jung | bayview@bayelectric.com | (510) 851 0212 | Electricians | Castro Valley · Alameda County | — | — |
| Bay Farm Development And Construction | Lam Duy Vo | — | (510) 882 1061 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Bay Full Construction | Gelu Gabriel Ilie | bayfullconstruction@gmail.com | (510) 465 9399 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Bay Guard Fire Protection | Bay Guard Fire Protection | info@bayguardfireprotection.com | (408) 318 8636 | Other | Oakland · Alameda County | — | — |
| Bay Home & Window | Catherine Lynn Falcon | — | (925) 846 3400 | Other | Pleasanton · Alameda County | — | — |
| Bay Home Construction | Fereidoun Nourafkan | — | (510) 246 4556 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Bay Landscape | Josue Abraham Pablo Perez | — | (510) 381 0755 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Bay Meridian Construction LLC | Premkishore Yeligati | — | (415) 570 4535 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Bay Mount Pro | Bay Mount Pro | — | (510) 485-9342 | Alarm and generators | Alameda · Alameda County | — | — |
| Bay Oak Solutions LLC | Christopher Adam Magana | — | (510) 679 7486 | Other | Oakland · Alameda County | — | — |