| All Air Heating And Cooling | All Air Heating And Cooling | allairlarryc@gmail.com | (415) 879 1015 | HVAC | Antioch · Contra Costa County | — | — |
| All American Doors | All American Doors | pedro@fl.allamericandoors.com | (925) 516 0451 | Other | Discovery Bay · Contra Costa County | — | — |
| All American Fence Corporation | William Frederick Jr Myers | allamericanfen@aol.com | (925) 743 8583 | Other | Danville · Contra Costa County | — | — |
| All American Glass & Shower INC | Steven James| Owens Steve James Owens | — | (925) 820 1748 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| All American Hauling & Demolition | All American Hauling & Demolition | — | (925) 256 0187 | Other | Concord · Contra Costa County | — | — |
| All American Paints | All American Paints | info@allamericanpaintco.com | (925) 705 1695 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| All American Roofing And Gutters | Graciano Teodoro Sanchez | — | (925) 584 0476 | Other roofers | Oakley · Contra Costa County | — | — |
| All Around Seamless Gutter Co | Michael Francis Milano | — | (925) 682 1480 | Other | Clayton · Contra Costa County | — | — |
| All Around The Garden LLC | Mejia Ivan Gonzalez | — | (925) 978 6189 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| All Bay Area Plumbing INC | Luis Alfredo Gonzalez | — | (650) 722 0944 | Other | Pinole · Contra Costa County | — | — |
| All Bay Construction Solutions INC | Christopher Wayne Davis | — | (925) 206 2374 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| All Bay Heating Air Conditioning & Construction INC | John Daniel Moody | — | (925) 288 9223 | HVAC | Walnut Creek · Contra Costa County | — | — |
| All Bay Rooting And Plumbing Services | Spencer Phaly Pho | — | (510) 325 7027 | Other | Lafayette · Contra Costa County | — | — |
| All City Door And Lock | All City Door And Lock | — | (925) 214 9793 | Other | Pleasant Hill · Contra Costa County | — | — |
| All Clear Pools & Spa Maintenance | Aschenwald Klaus | — | (925) 283 1087 | Pool | Concord · Contra Costa County | — | — |
| All Contract INC | Jacob Reed Ackerman | — | (925) 383 0784 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| All Cote Painting | Mark Richard Cote | — | (925) 216 9271 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| All Day Inspections | All Day Inspections | — | (510) 910-1103 | Inspectors | San Ramon · Contra Costa County | — | — |
| All Dry And Tidy | All Dry And Tidy | — | (925) 212 2539 | Other | Concord · Contra Costa County | — | — |
| All Food Service Installations | David Joseph Mancini | — | (510) 701 7368 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| All Glass Residential & Commercial INC | Hien Van Nguyen | — | (925) 685 1630 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| All Ground Electric & Concrete INC | Malekzadeh Fariborz | — | (510) 409 5479 | Electricians | Bay Point · Contra Costa County | — | — |
| All Heart Construction INC | Colin James Mc Elhattan | — | (925) 381 4509 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| All Interior Trim Works | All Interior Trim Works | — | (925) 550 4411 | Other | Discovery Bay · Contra Costa County | — | — |
| All Painting Solutions INC | Fabian Jesus Gutierrez | — | (925) 584 7101 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| All Phase Electric | Ceyhan Karluk Arbil | — | (925) 286 6544 | Electricians | Walnut Creek · Contra Costa County | — | — |
| All Premier Construction LLC | Antonio Vazquez Perez | — | (501) 557 6856 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| All Pro Communications | Thomas Wayman Sizemore | — | (925) 628 6570 | Electricians | Knightsen · Contra Costa County | — | — |
| All Pro Deck | All Pro Deck | allprodeck@gmail.com | (925) 283 2133 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| All Pro Painting Services INC | Adelso Antonio Perez | — | (415) 678 8551 | Windows, patio, painters | Pinole · Contra Costa County | — | — |
| All Pure Pool Service LLC | Michael Anthony Nisco | — | (925) 427 7946 | Pool | Pittsburg · Contra Costa County | — | — |
| All Raingutter Systems INC | Gary Charles Moody | — | (925) 381 7620 | Other roofers | Brentwood · Contra Costa County | — | — |
| All Roads Overhead Garage Doors | All Roads Overhead Garage Doors | — | (510) 375 8756 | Other | Richmond · Contra Costa County | — | — |
| All Season's Insulation | All Season's Insulation | — | (925) 935 7965 | Other | Pleasant Hill · Contra Costa County | — | — |
| All Seasons Tree Care INC | Uriel Medina Barron | info@allseasonstreecare.com | (707) 365 9452 | Tree | Richmond · Contra Costa County | — | — |
| All Star General Contractor | All Star General Contractor | — | (510) 207 9325 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| All Star HVAC | All Star HVAC | — | (925) 334 6596 | HVAC | Antioch · Contra Costa County | — | — |
| All Terrain INC | Steven Thomas Pohl | — | (415) 720 2257 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| All Things Good | Martin Alexander Minneboo | — | (510) 778 7001 | HVAC | Richmond · Contra Costa County | — | — |
| All Things Interior INC | Robert Michael Creamer | — | (925) 969 1587 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |