| Atticelite Insulation Solutions | Milosz Makarewicz | — | (408) 444 3758 | Other | Los Gatos · Santa Clara County | — | — |
| Au Electric Corporation DBA Aec Alarms | Yat-Pui Au | — | (408) 298 8888 | Electricians | San Jose · Santa Clara County | — | — |
| Audio High | Michael Elliot Silver | — | (650) 964 4000 | Electricians | Mountain View · Santa Clara County | — | — |
| Audio Video Evolution | Brian Reid Pilger | — | (408) 628 0771 | Other | Campbell · Santa Clara County | — | — |
| Audiology Systems INC | Lance Damian Julian | — | (408) 406 1449 | Other | San Jose · Santa Clara County | — | — |
| Austin Plumbing Services | William Joseph Jr Austin | — | (831) 332 9969 | Other | San Jose · Santa Clara County | — | — |
| Authentic Cabinetry | Authentic Cabinetry | authentic_cabinetry@outlook.com | (408) 559 9475 | Other | Campbell · Santa Clara County | — | — |
| Authentic Construction INC | Ramos Gerardo Rivas | — | (408) 929 5891 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Autograph Painting | Autograph Painting | — | (408) 737 0187 | Windows, patio, painters | Sunnyvale · Santa Clara County | — | — |
| Automated Building Control Solutions | Frank Jr Honesto | — | (408) 813 7013 | HVAC | San Jose · Santa Clara County | — | — |
| Automated Solutions Group INC | Michael William Anderson | — | (408) 432 0300 | HVAC | San Jose · Santa Clara County | — | — |
| Automatic Doors | Shan Lu | — | (408) 722 5223 | Other | Morgan Hill · Santa Clara County | — | — |
| Automatic Gate Installations INC | Richard Steven Dentoni | — | (408) 369 1245 | Other | Campbell · Santa Clara County | — | — |
| Automatic Gate Master & Garage Doors INC | Jephry Rafael Borjas | — | (510) 849 7246 | Other | San Jose · Santa Clara County | — | — |
| Automatic Gate Mates INC | John Darryl Repunte | office@automaticgatemates.com | (302) 725 7721 | Other | San Jose · Santa Clara County | — | — |
| Automatic Gate Pros | Ohad Maloul | — | (650) 669 9388 | Other | San Jose · Santa Clara County | — | — |
| Automation & Entertainment INC | Paul Francis Wilkinson | dawayne@automation-entertainment.com | (408) 353 4223 | GC, remodel, ADU | Los Gatos · Santa Clara County | — | — |
| Autumn Tree Care | Hugo Antonio Galan Ibarra | — | (408) 422 7519 | Tree | San Jose · Santa Clara County | — | — |
| Av Construction | Verapozo Angel | — | (408) 334 1571 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Avalos Marble & Granite - Tile INC | Alfonso Majano Avalos | — | (408) 980 0055 | Other | Santa Clara · Santa Clara County | — | — |
| Avant Electric INC | Brian Edward Gerlach | — | (408) 688 1546 | Electricians | San Jose · Santa Clara County | — | — |
| Avavnt Security | Avavnt Security | — | (408) 761 9561 | Electricians | Gilroy · Santa Clara County | — | — |
| Avelar Construction | Avelar-cisneros Pedro | info@avelarconstruction.com | (408) 425 9503 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Avenue5 Residential | Avenue5 Residential | media@avenue5.com | — | Property managers | Santa Clara · Santa Clara County | — | — |
| Avera Roofing & Remodeling INC | Brian Angelo Cravea | — | (408) 431 5532 | Other roofers | San Jose · Santa Clara County | — | — |
| Averill Works INC | Kenneth Earl Iii Averill | — | (831) 818 0073 | Other | San Martin · Santa Clara County | — | — |
| Avi Shechter | Avi Shechter | — | (818) 391 9164 | Electricians | San Jose · Santa Clara County | — | — |
| Avila Construction Company | Avila Becerra Sergio | — | (669) 264 1115 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Avila's Construction | Mendieta Avila Valentin | — | (408) 460 3968 | GC, remodel, ADU | Campbell · Santa Clara County | — | — |
| Aviles Painting | Aviles Painting | — | (669) 213 7890 | Windows, patio, painters | Morgan Hill · Santa Clara County | — | — |
| Avis Builders And Design | Avraham Safra | — | (312) 889 8722 | GC, remodel, ADU | Santa Clara · Santa Clara County | — | — |
| Avobay | Timothy James Snedden | — | (408) 250 6736 | GC, remodel, ADU | Campbell · Santa Clara County | — | — |
| Awbrey Development Company INC | John Craig Awbrey | awbrey@awbreydevelopment.com | (408) 667 5600 | GC, remodel, ADU | Santa Clara · Santa Clara County | — | — |
| Axiom Communications Systems | Allan Salehi | — | (408) 872 2445 | Electricians | San Jose · Santa Clara County | — | — |
| Axiom Renovation INC | Ziona Golan | office@axiom-renovation.com | (408) 702 2022 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Axis Mechanical INC | Thomas Michael Best | — | (408) 573 7400 | HVAC | San Jose · Santa Clara County | — | — |
| Axl Builders | Alexsaunder Jahan Ghanavati | — | (408) 348 2638 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Axsis Construction Co | Albert Henry Mosqueda | axsisal@yahoo.com | (408) 667 2664 | GC, remodel, ADU | Los Altos · Santa Clara County | — | — |
| Axtell Construction | Dean Frederick Axtell | — | (650) 796 5692 | GC, remodel, ADU | Palo Alto · Santa Clara County | — | — |
| Ay Emp INC | Charlis Alghiani Younan | — | (669) 200 8271 | HVAC | San Jose · Santa Clara County | — | — |