| B R Flooring INC | Brent Edward Roles | — | (800) 555 7859 | Other | Newark · Alameda County | — | — |
| B Reid Settlemier | B Reid Settlemier | — | (510) 638 8100 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| B Rubio D Construction INC | Ana Camila Gaona Bolanos | — | (628) 202 6544 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| B Side INC | Jessica Terese Hunt | — | (510) 451 7527 | Electricians | Oakland · Alameda County | — | — |
| B T C Bob Tedrick Construction INC | Tedrick Bob | — | (925) 454 0358 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| B Z Construction Co | Perez Benjamin | — | (510) 969 5241 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| B&b Custom Ornamental Craft | Castaneda Benjamin Vargas | — | (510) 557 4370 | Other | Castro Valley · Alameda County | — | — |
| B-k Mill And Fixtures INC | Suzanne Heidi Korhummel | — | (510) 713 0430 | Other | Newark · Alameda County | — | — |
| B. E. & D Builders INC | Erik Pedro Ramirez Vasquez | — | (510) 485 1681 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ba Glazing INC | Gregory Martin Scharlemann | — | (510) 625 8995 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Babb Construction | Richard Joseph Babb | — | (510) 731 8123 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Back In Shape Landscape & Maintenance Corp | Mario Alberto Montano Vargas | — | (510) 330 2142 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Baek Construction | Jeong Min Baek | — | (415) 308 7071 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Bahia Electric INC | Fernando Gomez Ramirez | — | (925) 339 4609 | Electricians | Pleasanton · Alameda County | — | — |
| Bailey Fence Company INC | Karrick Richard Bailey | — | (510) 783 2980 | Other | Hayward · Alameda County | — | — |
| Bailey Roofing | Katherine Elizabeth Bailey | — | (510) 209 9352 | Other roofers | Castro Valley · Alameda County | — | — |
| Bains Developments | Rajbinder Singh Bains | — | (510) 445 0227 | GC, remodel, ADU | Sunol · Alameda County | — | — |
| Bains Developments Commercial | Nirmal Kumar | — | (408) 410 6151 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Baird Construction | Mark Thomas Baird | — | (925) 895 1078 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Baires Construction INC | Gustavo Gabriel Carrera | service@bci-mech.com | (650) 455 1255 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Baires General Construction LLC | Fernando Jr Iglesias | — | (510) 856 7588 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bal's Custom Painting & General Contracting | Bal Subram Naidu | — | (510) 750 3434 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Balance Electric LLC | Andy Mckee Salazar | — | (510) 960 9002 | Electricians | Berkeley · Alameda County | — | — |
| Ball Electric LLC | Cedric Dwayne Ball | — | (510) 714 5019 | Electricians | Fremont · Alameda County | — | — |
| Balsam Design Build INC | Skylar Jarreau Mcgee | info@balsamdesignbuild.com | (510) 410 9510 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bam Woodworks | Bam Woodworks | — | (949) 878 0754 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bamboo Green Electric Industry Company | Lee Song Yang | — | (510) 376 6808 | Electricians | San Leandro · Alameda County | — | — |
| Bandera Construction Company | Juan Jose Bandera | — | (415) 756 9839 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Banner Building Company INC | Timothy Nelson Allen | — | (916) 240 3364 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Banner Roofing Company | Michael Charles Banner | — | (510) 895 4433 | Other roofers | San Leandro · Alameda County | — | — |
| Banton Scaffold INC | Humphrey Bruce Young | office@bantonscaffold.com | (510) 214 3060 | Other | Oakland · Alameda County | — | — |
| Bao Xuan Nguyen | Bao Xuan Nguyen | — | (510) 656 5342 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Bapc INC | Jeffrey Cuong Huynh | — | (510) 301 1600 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Baptiste Painting | Baptiste Painting | — | (510) 278 8563 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Baqc Builders | Valadez Sergio | — | (510) 398 3645 | Other roofers | Hayward · Alameda County | — | — |
| Bar In The Woods Construction | Barry Richard Jr Emerick | — | (510) 909 7225 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Baragon General Construction INC | Fernando Gonzalez Barajas | — | (510) 825 6792 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Barbara Butler Artist - Builder INC | Suzanne Mary Butler | — | (415) 864 6840 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Barbara Butler Playhouses LLC | Barbara Ann Butler | — | (415) 864 6840 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Barbero Drywall INC | Brian Daniel Sr Barbero | — | (925) 758 5190 | Other | Livermore · Alameda County | — | — |