| Am Works LLC | Anthony Jerome Miorana | — | (415) 424 1516 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Am-pac Builders INC | Aaron Nathaniel Gabourel | — | (510) 304 9047 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Amar Bains Co | Amar Singh Bains | — | (510) 329 0494 | GC, remodel, ADU | Sunol · Alameda County | — | — |
| Amar Teguia | Amar Teguia | — | (510) 396 0064 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Amarant Design & Build | Scott Norman Amarant | — | (925) 551 7786 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Amazing Designs Tile INC | Diego Armando Orozco Reina | — | (408) 690 7046 | Other | Hayward · Alameda County | — | — |
| Amazing Hardwood Floor INC | Hoa Ngoc Trinh | — | (510) 523 5346 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Amazon Construction LLC | Sohayle Mohabat | — | (925) 393 3042 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Amazonia Flooring | Amazonia Flooring | — | (510) 691 1678 | Other | Fremont · Alameda County | — | — |
| Amber Flooring INC | Zamir Ilan | info@amberflooring.com | (510) 652 6161 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Amber Tile | Amber Tile | — | (510) 295 7835 | Other | Oakland · Alameda County | — | — |
| Ambient Heating And Air | Chad Anthony Camilleri | — | (925) 525 5467 | HVAC | Livermore · Alameda County | — | — |
| Ambius | Eric Michael Graff | — | (510) 988 3184 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Ame Mechanical INC | Steven Michael Meyer | — | (510) 791 5085 | HVAC | Fremont · Alameda County | — | — |
| Ameca Custom Glass Corp | Jose De Jesus Martinez Carvajal | — | (510) 688 3696 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Amecy As INC | Matthew Scott Otsen | — | (510) 552 5115 | Electricians | Fremont · Alameda County | — | — |
| America's Drain & Jetting | America's Drain & Jetting | — | (925) 518 7545 | Other | Livermore · Alameda County | — | — |
| America's Garage Doors | America's Garage Doors | — | (650) 440 9903 | Other | Fremont · Alameda County | — | — |
| American Access Corporation DBA S Wang General Contractor | Steven David Wang | — | (925) 583 3080 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| American Array Solar Electric | Ashraf Mohammad Raoufi | — | (510) 760 2346 | Other roofers | Livermore · Alameda County | — | — |
| American Asphalt Repair And Resurfacing Company INC | Allan Anthony Henderson | — | (510) 723 0280 | Other | Hayward · Alameda County | — | — |
| American Attic | American Attic | — | (800) 461 2017 | Other | Oakland · Alameda County | — | — |
| American Auto Glass Solutions | American Auto Glass Solutions | — | (510) 830-6869 | Windows, patio, painters | Alameda · Alameda County | — | — |
| American Building Service INC | Alexander Julian Canha | — | (510) 418 8752 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| American Chimney Services LLC | Steven Craig Lewis | — | (510) 317 9400 | Other | Hayward · Alameda County | — | — |
| American Custom Contractors | Kerry Lee Kiernan | — | (925) 337 1291 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| American Dream Contractors | James Melvin Thompson | — | (925) 361 0792 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| American Eagle Construction & Maintenance | Linda Marie Gomez | — | (510) 299 9931 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| American Fire | American Fire | — | (925) 368 6615 | Other | Pleasanton · Alameda County | — | — |
| American Glass & Glazing | Ahmad Omid Arjumand | — | (925) 495 4173 | Windows, patio, painters | Livermore · Alameda County | — | — |
| American Leak Detection Of The East Bay | Joseph Herout Thien | — | (510) 548 6816 | Other | Berkeley · Alameda County | — | — |
| American Pacific Windows And Construction INC | Wojciech Maciej Janda | — | (773) 818 4400 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| American Power Services Co | Jon Erik Blosser | — | (510) 274 5800 | Electricians | Hayward · Alameda County | — | — |
| American Precision Builders | American Precision Builders | — | (510) 827 7684 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| American Property Services Plus | Joe Jay Hocker | — | (510) 377 9704 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| American Quality Roofing | Anthony Todd Stotesberry | — | (408) 726 9796 | Other roofers | Fremont · Alameda County | — | — |
| American River Framing LLC | Alvaro Rolando Medina | — | (916) 955 1543 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| American Sandblasting Company | Edward Henry Wolf | — | (650) 579 3737 | Windows, patio, painters | Hayward · Alameda County | — | — |
| American Sheet Metal & Mechanical | Peter Alexander Cochran | — | (925) 231 7635 | HVAC | San Leandro · Alameda County | — | — |
| American Sign Installation Co | Daniel Hugh Twomey | — | (925) 784 9341 | Other | Livermore · Alameda County | — | — |