| Avila Group Construction Co LLC | Francisco J Avila Longoria | — | (510) 860 4425 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Aviles Flooring | Aviles Flooring | — | (510) 593 3027 | Other | San Leandro · Alameda County | — | — |
| Avimo Audio Visual Solutions INC | Byron Eduardo Miranda Santizo | — | (415) 572 5055 | Other | San Leandro · Alameda County | — | — |
| Avlis Construction INC | Carlos Enrique Silva Jacinto | — | (510) 453 5723 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Avlock | Kurt Robert Ditmer | — | (510) 909 0690 | Other | Pleasanton · Alameda County | — | — |
| Avocado Electric LLC | Estevan Robert Estrada | — | (510) 544-3802 | Electricians | Dublin · Alameda County | — | — |
| Awadalla And Sons Home Solutions DBA The Brothers That Just Do | Larry Lee Ingalls | — | (214) 949 9141 | Other | Livermore · Alameda County | — | — |
| Awesome Heating And Air Conditioning INC | Todd Edward Rillston | — | (925) 989 7414 | HVAC | Livermore · Alameda County | — | — |
| Awesome Renovations INC | Felipe Josue Gomez | — | (510) 387 7359 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Awill Construction INC | Bing Quan Chen | — | (510) 813 2718 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Axis Construction | Bizhan Honarvar Mahallati | info@axis-construction.com | (510) 732 6111 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Axolotl Electric | Martin Andres | — | (510) 910 2856 | Electricians | Oakland · Alameda County | — | — |
| Ayaan Builders LLC | Walid Sardarmohammad | info@ayaanbuilders.com | (510) 934 6624 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Ayala's Plumbing Solutions | Ayala's Plumbing Solutions | — | (510) 710 3872 | Other | San Leandro · Alameda County | — | — |
| Azer Heating & Cooling | Azer Heating & Cooling | — | (510) 475 5700 | HVAC | Union City · Alameda County | — | — |
| Azevedo Enterprises INC | Claudio Emilio Jr Azevedo | — | (510) 917 3103 | Electricians | San Leandro · Alameda County | — | — |
| B & B Builders INC | Joseph Anthony Barbuscia | — | (925) 409 2090 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| B & B Contractors Services INC | Jose Roberto Olguin | — | (415) 714 9922 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| B & B Electric | Jose Manuel Beltran | — | (925) 829 4110 | Electricians | Dublin · Alameda County | — | — |
| B & B Mechanical Services INC | Brian Matthew Schloffel | — | (925) 931 0562 | HVAC | Pleasanton · Alameda County | — | — |
| B & B Plumbing & Installations | Robert Joseph Becker | — | (510) 434 1124 | Other | Oakland · Alameda County | — | — |
| B & B's Pool Repairs | B & B's Pool Repairs | — | (510) 775 4326 | Pool | San Lorenzo · Alameda County | — | — |
| B & C Transit INC | Jason Michael Gomez | — | (510) 483 3560 | Electricians | Oakland · Alameda County | — | — |
| B & J Merge Construction INC | Juan Bernardo Ramos | — | (510) 395 1400 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| B A Morrison | B A Morrison | bamorrison@bamorrison.com | (510) 538 9817 | HVAC | Castro Valley · Alameda County | — | — |
| B Alarmed | B Alarmed | — | (571) 278 3249 | Other | Fremont · Alameda County | — | — |
| B Bros Construction INC | Emma Pandzic | — | (510) 351 3048 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| B C G Rockworks | B C G Rockworks | — | (510) 213 4221 | Windows, patio, painters | Oakland · Alameda County | — | — |
| B D Construction | Brandon James Dawkins | — | (925) 321 9526 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| B D M Electric INC | Moira Katherine Fry | — | (510) 917 5078 | Electricians | San Leandro · Alameda County | — | — |
| B E Martin Co | Blair Edward Martin | — | (510) 220 2278 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| B E Renovation & Construction INC | Soi Chio Sio | — | (510) 385 4884 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| B H Elite Builders | Brian Christopher Huie | — | (415) 632 7283 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| B M E Electrical Construction | Barry Lynn Mc Graw | — | (510) 817 4225 | Electricians | Oakland · Alameda County | — | — |
| B M Electrical & Lighting Service Co | Ma Binglin | — | (510) 541 9990 | Electricians | Oakland · Alameda County | — | — |
| B Meyer & Co | Brendan Gerald Meyer | — | (510) 504 3409 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| B N Quality Construction | Nachor Boyette | — | (408) 991 2891 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| B P Construction | Miguel Jimenez Patino | — | (650) 995 0327 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| B R Concrete | B R Concrete | — | (510) 376 9616 | Other | Alameda · Alameda County | — | — |
| B R Electric | Brian Richard Ramirez | — | (925) 922 7371 | Electricians | Pleasanton · Alameda County | — | — |