| Bay Area Landscaping Services | Martinez Jesus | — | (510) 681 3262 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Bay Area Low Voltage LLC | Jeffrey Wai-Yan Chan | — | (510) 388 4817 | Other | Bethel Island · Contra Costa County | — | — |
| Bay Area Motorized Shades | Bay Area Motorized Shades | — | (415) 596 6921 | Other | Concord · Contra Costa County | — | — |
| Bay Area Paving LLC | Brandon Longino Acosta | — | (925) 597 8333 | Other | Pittsburg · Contra Costa County | — | — |
| Bay Area Plastering | Bay Area Plastering | giordanoplastering@gmail.com | (925) 202 9501 | Other | Pittsburg · Contra Costa County | — | — |
| Bay Area Plug | Oscar Rolando Cruz | — | (415) 726 9957 | Electricians | San Pablo · Contra Costa County | — | — |
| Bay Area Plumbing Pros INC | Solomon Joseph Terry | — | (415) 410 7757 | Other | Crockett · Contra Costa County | — | — |
| Bay Area Railings INC | Paul William Petruzzelli | — | (510) 367 3206 | Other | Richmond · Contra Costa County | — | — |
| Bay Area Reconstruction Services | Bellemy Ann Raygoza | — | (925) 949 9271 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Bay Area Remodeling | Bay Area Remodeling | — | (415) 261 1606 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Bay Area Remodels And Hardscape | Jesus Rios Sanchez | — | (510) 681 3262 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Bay Area Roofing Experts | James Michael Campos | info@bayarearoofingexperts.com | (925) 997 4529 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| Bay Area Shower Doors | Bay Area Shower Doors | — | (650) 771 7202 | Other | Antioch · Contra Costa County | — | — |
| Bay Area Spartans Construction | Ramirez Arturo Lares | — | (925) 967 7200 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Bay Area Traffic Control | Bay Area Traffic Control | — | (408) 545 8889 | Other | Crockett · Contra Costa County | — | — |
| Bay Area Tree Care INC | Fernando Duarte Caldera | info@bayareatreecare.net | (510) 222 2963 | Tree | Pinole · Contra Costa County | — | — |
| Bay Area Wall And Ceiling | Bay Area Wall And Ceiling | — | (925) 639 1593 | Other | Danville · Contra Costa County | — | — |
| Bay Area Welding And Maintenance | Bay Area Welding And Maintenance | — | (510) 233 3485 | Other | Richmond · Contra Costa County | — | — |
| Bay Area Woodworking | Bay Area Woodworking | — | (925) 383 3951 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Bay Area's Best Electric | David Ian Gurule | — | (925) 957 6890 | Electricians | Pacheco · Contra Costa County | — | — |
| Bay Best Construction INC | Hooman Mousavi Nazari | — | (408) 507 0960 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Bay Breakers Electric | Renaldo Paul La Chaux | — | (925) 404 3463 | Electricians | Concord · Contra Costa County | — | — |
| Bay Build Construction INC | Albert Youngsuk Jang | — | (925) 639 7009 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Bay Builder | Bay Builder | — | (925) 708 5727 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Bay Cal Painting | William Chandon Codde | impallari@gmail.com | (925) 935 1999 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Bay Cal Paving | Bay Cal Paving | — | (707) 995 1817 | Other | Concord · Contra Costa County | — | — |
| Bay Casas Construction LLC | Noe Abraham Gonzalez Casas | — | (925) 481 2478 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Bay Circle Construction INC | Mario Alberto Alvarez | — | (925) 580 0916 | Other | Brentwood · Contra Costa County | — | — |
| Bay Cities Construction | Robert William Lloyd | — | (925) 625 5823 | GC, remodel, ADU | Knightsen · Contra Costa County | — | — |
| Bay Cities General Contractor INC | Pedro Lopez Sr Cerecedo | — | (510) 932 2850 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Bay Cities Paving & Grading INC | Benjamin Lewis Jr Rodriguez | — | (925) 687 6666 | Other | Concord · Contra Costa County | — | — |
| Bay Cities/myers & Sons Joint Venture | Cities Paving & Grading INC Bay | — | (925) 687 6666 | Other | Concord · Contra Costa County | — | — |
| Bay City Construction | Ali Ibrahim Dzhudzho | — | (325) 525 1636 | Electricians | Concord · Contra Costa County | — | — |
| Bay City Mechanical Incorporated | Marisa Ann Calavano | — | (510) 233 7000 | HVAC | Richmond · Contra Costa County | — | — |
| Bay City Mechanical Service INC | Helge Theiss-Nyland | — | (510) 233 7000 | HVAC | Richmond · Contra Costa County | — | — |
| Bay City Painting | Bay City Painting | — | (925) 634 1580 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Bay Crest Construction | Juan Carlos Romero Romero | — | (925) 383 9593 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Bay Custom Woodworking INC | Peter Prospero Dito | — | (510) 377 8683 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Bay Demo | Bay Demo | mateus@baydemo.com | (510) 978 9010 | Other | Walnut Creek · Contra Costa County | — | — |
| Bay Drainage And Landscaping | Bay Drainage And Landscaping | — | (925) 325 1150 | Windows, patio, painters | Danville · Contra Costa County | — | — |