| Bardo Builders Collective INC | Martin Eduardo Figueroa | — | (510) 390 9669 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Barefoot Builders/remodelers | Barefoot Builders/remodelers | — | (925) 324 2139 | Electricians | Oakland · Alameda County | — | — |
| Barker Construction | Jerrel Dean Barker | — | (510) 395 3037 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Barker Heating & Cooling | Christopher Joseph Barker | — | (925) 560 0280 | HVAC | Livermore · Alameda County | — | — |
| Barnett Concrete | Barnett Concrete | — | (925) 449 8870 | Other | Livermore · Alameda County | — | — |
| Barnett Plumbing & Water Heaters | Philip Graham Barnett | — | (925) 872 0805 | Other | Livermore · Alameda County | — | — |
| Barraza Construction | Lenin Jaziel Barraza | — | (510) 220 3721 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Barraza's Floor Systems Incorporated | Felix Rios Barraza | — | (510) 440 0600 | Other | Fremont · Alameda County | — | — |
| Barrera & Associates Construction INC | William Israel Barrera | — | (510) 614 7385 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Barrera's Builders | Barrera's Builders | — | (510) 517 3388 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Barrera's General Contractor | Barrera's General Contractor | — | (510) 326 1315 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Barrios Construction | Edgar Leonel Barrios Recinos | — | (510) 316 7790 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Barrow Electrical Systems | Jamaal Vincent Barrow | support@barrowelectricalsystems.com | (510) 600 2133 | Electricians | Oakland · Alameda County | — | — |
| Barry Garcia Landscaping | Barry Garcia Landscaping | — | (650) 921 2751 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Barry Ghanbari & Associates | Manoucher Ghanbari Mohammadi | — | (510) 847 7859 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Barry's Construction | Freddy Arturo Castillo-barry | bear386@sbcglobal.net | (619) 992-6140 | Electricians | San Leandro · Alameda County | — | — |
| Bartholomew General & Electrical Contractors | Ray Simon Bartholomew | — | (510) 589 2202 | Electricians | Hayward · Alameda County | — | — |
| Barvilla Construction | Arnolfo Colacion Barvilla | — | (415) 797 8647 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Basco Drywall & Painting Co | Janice Lee Yrueta | — | (510) 357 3818 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Baseline Builder | Baseline Builder | contact@waypoint-ingenuity.com | (415) 430 7635 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Battalion One Fire Protection INC | Michael Wayne Herbert | — | (510) 653 8075 | Electricians | San Leandro · Alameda County | — | — |
| Bautista Universal Colors | Bautista Universal Colors | — | (510) 206 6052 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Bay Area Appliance Installation INC | Paul Burton Hooker | paul@bayareaapplianceinstallation.com | (510) 240 2560 | Other | Fremont · Alameda County | — | — |
| Bay Area Arma Coatings | John Barnett Iii Mc Comb | — | (925) 449 7100 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Bay Area Builders | Bay Area Builders | — | (510) 692 5968 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Bay Area Builders | Bay Area Builders | — | (650) 219 2046 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Bay Area Building Services | Jasmani Eduardo Rodriguez Padilla | — | (650) 679 4739 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bay Area Climate Control | Ron Borisov | info@bayareaclimatecontrol.com | (510) 391-5597 | HVAC | Hayward · Alameda County | — | — |
| Bay Area Construction Co | Gutierrez Cecilio | — | (925) 765 4331 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bay Area Construction Services | Joseph Keith Lovel | — | (510) 908 0658 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Bay Area Contract Carpets INC | Kenneth Edward Scott | kevin@bayareacontractcarpets.com | (510) 613 0300 | Other | Oakland · Alameda County | — | — |
| Bay Area Deck | Bay Area Deck | — | (415) 613 4450 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Bay Area Developers LLC | Nour Ali Chaaban | — | (510) 345 3455 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Bay Area Fire Protection LLC | William Samuel Aguilar | info@hoodcleaningco.com | (925) 447 7600 | Other | Livermore · Alameda County | — | — |
| Bay Area Glass Pro | Bay Area Glass Pro | — | (510) 300 4528 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Bay Area High Reach INC | Brian Patrick Burns | — | (510) 276 9211 | Other | Livermore · Alameda County | — | — |
| Bay Area HVAC | Bay Area HVAC | bayairhvac@gmail.com | (408) 246-6010 | HVAC | Alameda · Alameda County | — | — |
| Bay Area Landscapes | Bay Area Landscapes | — | (510) 944 0898 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Bay Area Modern Interiors INC | Dmitriy L Kornach | — | (415) 595 3382 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bay Area Molding INC | Robert Frederick Stenrose | — | (510) 657 3667 | GC, remodel, ADU | Fremont · Alameda County | — | — |