| Absa Plumbing | Absa Plumbing | — | (510) 689 7172 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Absl Construction | Luis Maria Allende | — | (510) 727 0900 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Absolute Air Solutions | Rudolph Christopher Delphino | — | (510) 901 7166 | HVAC | Hayward · Alameda County | — | — |
| Absolute Pro Plumbing INC | Anthony Joel Cedillo | info@absoluteproplumbing.com | (510) 364 9926 | Other | Hayward · Alameda County | — | — |
| AC Electrical LLC | Anthony Charles Ward Cranswick | — | (415) 996 5678 | Electricians | San Leandro · Alameda County | — | — |
| Ac&f General Construction INC | Avelino Gumaro Yescas | — | (415) 238 9495 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Accel Electric | Francisco Rodriguez Aguilera | accel@accelelectric.com | (510) 377 8157 | Electricians | Castro Valley · Alameda County | — | — |
| Accent Design Custom Flooring | Accent Design Custom Flooring | — | (510) 278 0810 | Other | Castro Valley · Alameda County | — | — |
| Access Construction & Garage Doors | Tannous Emile Moufarrej | — | (510) 410 1859 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Access Painting And General Construction INC | Villalba Daniel | — | (510) 331 6867 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Access Shield | Raman Huziy | — | (510) 500 5116 | Other | Newark · Alameda County | — | — |
| Accucraft Construction | Leif Erik Jr Naas | — | (510) 581 3726 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Accurate Firestop & Insulation | Gabrielle Alexis Lucatero | — | (925) 701 8600 | Other | Pleasanton · Alameda County | — | — |
| Ace Bay Plumbing Co | Luis Manuel Vazquez | — | (510) 220 9539 | Other | Oakland · Alameda County | — | — |
| Ace Electric | Cesar Antonio Swaby | — | (510) 368 4047 | Electricians | Oakland · Alameda County | — | — |
| Ace Locksmith Company | Joseph Yaukwai Lam | — | (510) 835 9266 | Other | Oakland · Alameda County | — | — |
| Ace Sewer Lateral Contractor | Ace Sewer Lateral Contractor | — | (510) 258 7385 | Other | Hayward · Alameda County | — | — |
| Ace's Garage Door Repair & Installation | Muhammad Rubin Salem | — | (510) 213 3761 | Other | Hayward · Alameda County | — | — |
| Acer Landscaping & Tree Care INC | Lopez Segura Eliazar | — | (650) 784 5357 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Acetech Painting Co | Moon Kyu Yu | — | (510) 388 8989 | Windows, patio, painters | Union City · Alameda County | — | — |
| Ackland International INC | Ekundayo Akinwande Sowunmi | — | (510) 564 4284 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ackley Sheetmetal INC | Dennis Craig Ackley | support@ackind.net | (510) 760 9879 | HVAC | Hayward · Alameda County | — | — |
| Acme Awning Company | Chih Ling Han | — | (510) 635 6383 | Other | Hayward · Alameda County | — | — |
| Acme Fire Extinguisher Company | Bruce Howard Macleod | — | (510) 532 4040 | Other | Oakland · Alameda County | — | — |
| Acme Pacific Repairs INC | Ranjit Singh Ratra | info@acmepacificrepairs.com | (510) 252 2070 | Other | Livermore · Alameda County | — | — |
| Acorn Onsite INC | Timothy Carl Johnston | eben@eyebytes.com | (925) 447 5200 | Other | Livermore · Alameda County | — | — |
| Acosta Construction INC | Jesus Nelson Acosta | — | (510) 581 8249 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Acosta Electric And Construction | Miguel Devera Acosta | — | (510) 828 0526 | Electricians | San Leandro · Alameda County | — | — |
| Acosta's Concrete | Acosta's Concrete | — | (510) 376 1159 | Other | Fremont · Alameda County | — | — |
| Acrd Roofing Incorporated | Aida Carlon-Ortiz | — | (510) 712 5045 | Other roofers | San Leandro · Alameda County | — | — |
| Across The Bay Painting | Across The Bay Painting | — | (415) 261 0693 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Act Professional Painting And Decorating | Act Professional Painting And Decorating | — | (510) 435 9955 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Action Hauling And Demo INC | Helder Lucio Pinto | actionhaulingdemoinc@gmail.com | (510) 375 3798 | Other | Oakland · Alameda County | — | — |
| Activate Garage Doors | Activate Garage Doors | — | (669) 239 1304 | Other | Hayward · Alameda County | — | — |
| Active Plumbing & Rooter | Active Plumbing & Rooter | — | (510) 200 2497 | Other | Fremont · Alameda County | — | — |
| Ad & C Design INC | Chai Yunzhou | — | (510) 278 2498 | Other | Fremont · Alameda County | — | — |
| Ad-in Incorporated | Matthew John Bishop | — | (510) 656 6700 | Other | Fremont · Alameda County | — | — |
| Adam Roofing | Adam Roofing | — | (510) 995-0194 | Other roofers | Alameda · Alameda County | — | — |
| Adam T Corkhill | Adam T Corkhill | — | (510) 326 7749 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Adan Ramos | Adan Ramos | — | (510) 825 2155 | GC, remodel, ADU | Hayward · Alameda County | — | — |