| Barry Electrical Co | Yong Feng Situ | — | (415) 215 9782 | Electricians | San Francisco · San Francisco County | — | — |
| Barry O Mahony Construction | Barry Pena O Mahony | — | (415) 509 9852 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bartlett Tree Experts | Bartlett Tree Experts | — | (415) 206-0790 | Tree | San Francisco · San Francisco County | — | — |
| Barton Builders | Barton Builders | — | (415) 866 7700 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Basset Engineering | Shane Joseph Mccarthy | — | (415) 930 2385 | Other | San Francisco · San Francisco County | — | — |
| Baxter Construction LLC | Kenneth Michael Baxter | — | (415) 529 2915 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Air Heating & Cooling | Brittany Janee Kesler | — | (530) 412 3933 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Area Arborist Cooperative INC | Ian Edward Butler | — | (415) 759 5420 | Other | San Francisco · San Francisco County | — | — |
| Bay Area Builders | Bay Area Builders | — | (510) 331 4931 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Area Builders | Bay Area Builders | — | (415) 272 0957 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Area Cabinetry INC | Felix Grau | info@bayareacabinetry.com | (415) 798 9393 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Area Comfort Solutions | Bay Area Comfort Solutions | captaincomfort510@gmail.com | (925) 266-3678 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Area Deconstruction INC | Constantine Dennis Rodatos | — | (888) 714 7444 | Other | San Francisco · San Francisco County | — | — |
| Bay Area Garage Door Repair INC | David Alan Upham | — | (415) 713 4566 | Other | San Francisco · San Francisco County | — | — |
| Bay Area Garage Doors & Gates | Talia Zubery | — | (628) 219 9621 | Other | San Francisco · San Francisco County | — | — |
| Bay Area Home Inspections | Bay Area Home Inspections | info@bayareahomeinspections.com | (415) 515-3355 | Inspectors | San Francisco · San Francisco County | — | — |
| Bay Area Lightworks INC | Jim Ze Qiang Lau | info@bayarealightworks.com | (415) 822 2336 | Electricians | San Francisco · San Francisco County | — | — |
| Bay Area Mold Pros | Bay Area Mold Pros | — | (866) 982-4257 | Inspectors | San Francisco · San Francisco County | — | — |
| Bay Area Painter- Interior/exterior | Bay Area Painter- Interior/exterior | — | (415) 361-3905 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Bay Area Painting & Decorating | Bay Area Painting & Decorating | — | (415) 619 1230 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Bay Area Pipe & Equipment INC DBA Bay Area Mechanical | Mara Anne Kitching | — | (925) 642 9768 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Area Plumbing | Bay Area Plumbing | — | (415) 668 8000 | Other | San Francisco · San Francisco County | — | — |
| Bay Area Roofing Solutions | Sanchez Rigoberto Gonzalez | — | (415) 712 8260 | Other roofers | San Francisco · San Francisco County | — | — |
| Bay Breeze Landscaping INC | Eduardo Lopez | — | (415) 283 6798 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Bay Bridge Garage Door | Gabriel Gustavo Bo Cesena | baybridgegarage@gmail.com | (408) 580 7949 | Other | San Francisco · San Francisco County | — | — |
| Bay Build Design INC | Adam Ashley Barnum | — | (415) 517 5104 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay C T Construction INC | Zi Pei Tang | — | (415) 308 2838 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Cal Plumbing INC | Sergio Ivan Gamboa | — | (415) 702 7920 | Other | San Francisco · San Francisco County | — | — |
| Bay Cities Painters & Decorators INC | Raul Gonzalez | — | (415) 777 0080 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Bay City Plumbing | Colin Butturff Delaney | — | (415) 652 2093 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Concept Builder Group | Ri Feng Li | — | (415) 828 8308 | Electricians | San Francisco · San Francisco County | — | — |
| Bay County Construction Company | Zhu Yue | — | (415) 769 8746 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay County Construction INC | Yue Zhu | — | (628) 316 8238 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Electric | Kevin Jon Valerio | bayview@bayelectric.com | (415) 640 9849 | Electricians | San Francisco · San Francisco County | — | — |
| Bay Engineering LLC | Matthew Christopher Cox | — | (415) 343 0220 | Other | San Francisco · San Francisco County | — | — |
| Bay Heropro Construction | Feng Jianxiong | — | (415) 999 6626 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Line Construction | Juan Carlos Arreguin | — | (415) 518 1800 | Other | San Francisco · San Francisco County | — | — |
| Bay Line Cutting & Coring INC | Everardo Arreguin | — | (415) 508 1800 | Other | San Francisco · San Francisco County | — | — |
| Bay Metro Corporation | Manuel Cid Gonzalez | dsmith@baymetro.com | (415) 626 4067 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bay Renovation And Construction | Paul Arthur Lutich | — | (415) 304 7798 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |