| Assured Quality Restoration & Painting | Assured Quality Restoration & Painting | — | (510) 677 7608 | GC, remodel, ADU | Sunol · Alameda County | — | — |
| Astro Roofing INC | Salomon Urizar-Jimenez | — | (916) 515 6901 | Other roofers | Oakland · Alameda County | — | — |
| At The Top Roofing Co | Bennett Raymond Fernandes | — | (209) 836 3281 | Other roofers | Pleasanton · Alameda County | — | — |
| At Your Service Rooter And Drain Specialist | Adamu Aziz Muhammad | — | (510) 300 5794 | Other | Oakland · Alameda County | — | — |
| Atami Construction | Gonzalo Salvador Arestizabal | — | (510) 861 1962 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Atb Construction | Balog Atila | — | (530) 575 9557 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Atelier 19ad6 | Trung Dang Trannam Nguyen | — | (510) 376 8816 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Atkins Construction | Gary Lee Vukmirovich | interested@domainmarket.com | (510) 481 0224 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Atkinson Tile & Design | Atkinson Tile & Design | — | (925) 518 6663 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Atlas Roofing Bay Area | Or Sina | — | (669) 732 1615 | Other roofers | Newark · Alameda County | — | — |
| Atlas Tr INC DBA Atlas General Construction | Bilal Ilter | — | (650) 440 2236 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Atr Welding INC | Lee Angelo Viloria | lee@atrwelding.com | (510) 363 2490 | Other | Hayward · Alameda County | — | — |
| Atthowe Fine Art Prefabrication Services | Bryan Robert Cain | — | (510) 654 6816 | Other | Oakland · Alameda County | — | — |
| Attic Pros INC | Serhiy Bukin | — | (800) 543 0382 | HVAC | Oakland · Alameda County | — | — |
| Attic Solutions Of California LLC | Niv Goldman | — | (510) 500 5007 | Other | San Leandro · Alameda County | — | — |
| Attic Star INC | Koriat Shiran | — | (800) 444 8180 | HVAC | Hayward · Alameda County | — | — |
| Attical INC | Lynette Colleen Watkins | — | (408) 990 6306 | Other | Fremont · Alameda County | — | — |
| Audible Concept | Audible Concept | — | (510) 896 9771 | Other | Fremont · Alameda County | — | — |
| Audio Visual Service Provider | Huynh Richard | — | (510) 760 0931 | Other | Fremont · Alameda County | — | — |
| Aufdermauer Enterprises INC | John William Aufdermauer | — | (510) 244 7248 | Windows, patio, painters | Union City · Alameda County | — | — |
| Aum Home Solutions INC | Parth Padmakant Prajapati | — | (510) 565 2652 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Aum Plumbing Services | Sharma Deepak | — | (510) 592 4545 | Other | Newark · Alameda County | — | — |
| Aurora Fencing INC | Henry David Jacob Chavez | henry@aurorafencing.org | (510) 988 2800 | Other | Union City · Alameda County | — | — |
| Aurora Painting & Decorating INC | Dean Eric Byington | — | (510) 655 9267 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Authentic Restoration And Waterproofing INC | Jacob Ibrahim Habache | — | (510) 732 5400 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Authentic T F G INC | Ernesto Guadalupe Ruiz Esparza | — | (408) 667 4623 | Other | Newark · Alameda County | — | — |
| Authentic Tile & Stone | Wilmer Chavez | — | (510) 529 5661 | Other | Oakland · Alameda County | — | — |
| Authority Painting | Authority Painting | — | (510) 828 4055 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Automated Services And Products INC | Richard Pardo Fernandez | — | (510) 658 2727 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Av Concrete Cutting INC DBA Cutting And Demolition Services | Alexander Valencia | — | (510) 458 4522 | Other | Hayward · Alameda County | — | — |
| Av Homes Construction INC | Jacob Kyle Larson | — | (925) 200 1170 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Av Spaces INC | Adam Brian Willis | — | (925) 785 5243 | Other | Alameda · Alameda County | — | — |
| Avalos Plumbing & Drain Cleaning | Rafael Avalos Gomez | — | (510) 306 5806 | Other | Oakland · Alameda County | — | — |
| Avant Garde Construction Enterprise | Matthew Alexander Gatterman | — | (510) 881 6573 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Avanti Storage Systems INC | William Paul Virnig | — | (510) 351 6300 | Other | San Leandro · Alameda County | — | — |
| Avdg LLC | Frederick John Belmore | — | (415) 455 9913 | Other | Fremont · Alameda County | — | — |
| Avi A Messeri | Avi A Messeri | — | (510) 527 8583 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Avi Nevo | Avi Nevo | — | (646) 303 1351 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Avi Plumbing INC | Ibarra Armando Venegas | — | (415) 341 7278 | Other | Oakland · Alameda County | — | — |
| Avid Communication Networks | Avid Communication Networks | — | (510) 353 0587 | Other | Fremont · Alameda County | — | — |