| Budget Plumbing & Drain Service | Anticona Villa Estanislao | — | (415) 608 7042 | Other | San Francisco · San Francisco County | — | — |
| Buena Vista Builders INC | Charles Gerard Agosta | — | (415) 863 6550 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Buhler Commercial | Steven Christopher Jr Buhler | info@buhlercommercial.com | (415) 610 8650 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Buhler Construction Company INC | Louis Alexander Buhler | — | (415) 658 7846 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Build An Idea DBA Fresh Homes | Suki Tsang | — | (650) 260 3665 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Build And Design Construction | Patirck David O'malley-daly | — | (415) 517 0139 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Build For Life Construction | Elkhan Imameddin Nuraliyev | contact@buildforlifeconstruction.com | (415) 707-7007 | Electricians | San Francisco · San Francisco County | — | — |
| Build Group INC | Nathan Christopher Rundel | invest@buildgroup.com | (415) 367 9399 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Build Sf INC | Simon Humphrey Gil Spark | info@buildsf.com | (415) 602 4062 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Builda Global Building Company | Pik Wai Cheng | — | (415) 722 5023 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Buildcorp INC | Brian Christopher Ly | hello@buildcorp.com | (925) 339 8607 | Electricians | San Francisco · San Francisco County | — | — |
| Builders Coordination INC | Thomas Tong Nguyen | — | (415) 939 1110 | Electricians | San Francisco · San Francisco County | — | — |
| Building By Design | Building By Design | — | (415) 661 2235 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Building Construction Express | Dairong Guan | — | (415) 812 8782 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Building Efficiency INC | David Keola Hamburger | — | (415) 831 4535 | HVAC | San Francisco · San Francisco County | — | — |
| Buildr General Contractor | Buildr General Contractor | — | (415) 710 9054 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Buildsingular Jv | Group INC Build | — | (415) 367 9399 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Built Steady INC | Raquel Luna Pacheco | — | (602) 773 6663 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bull Construction | Peter Wright Bull | — | (415) 740 1847 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bullard's Heating & Air INC | Joseph Michael Bullard | — | (415) 621 1987 | HVAC | San Francisco · San Francisco County | — | — |
| Bullens Bay Construction | Daire Micheal Lordan | — | (415) 317 1631 | Other | San Francisco · San Francisco County | — | — |
| Bunch Electric | Willie James Bunch | — | (510) 214 6427 | Electricians | San Francisco · San Francisco County | — | — |
| Burdell Construction INC | Peter Daniel Towey | — | (415) 408 6365 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Burgess Enterprises | Darryl Louis Burgess | — | (415) 648 2288 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Burks Electric Co | Steven Seaborn Burks | — | (415) 515 2926 | Electricians | San Francisco · San Francisco County | — | — |
| Burton's Construction | Burton Wuen Jay | — | (415) 205 0920 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Buzz Landscape | Buzz Landscape | — | (415) 312 0142 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Bv Electric INC | Bokaric Miroslav | — | (415) 666 9990 | Electricians | San Francisco · San Francisco County | — | — |
| Bw Company INC | Benjamin Zijian Wu | — | (415) 939 4800 | Other | San Francisco · San Francisco County | — | — |
| Byington Electric | Nicholas Andrew Shaon | info@byingtonelectric.com | (415) 621 6500 | Electricians | San Francisco · San Francisco County | — | — |
| Bz And Bz Corporation INC | Junfeng Zhang | — | (415) 351 9283 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C & E Electric & Fire Alarm Services | Carlos Alberto Garcia Manzanares | — | (888) 410 1648 | Electricians | San Francisco · San Francisco County | — | — |
| C & H Home Construction | Jian Wen Huang | — | (415) 816 0013 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C & K Construction | Kent Phu Le | — | (415) 724 8941 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C & K Housing Construction Co | Chao Zhen Ma | — | (415) 756 4126 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C & L Builders INC | Paul Chow | — | (415) 760 1126 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C & L Plumbing INC | Huo Huai Chen | — | (415) 609 2182 | Other | San Francisco · San Francisco County | — | — |
| C & M General Contractor | Thomas Paul Munka | — | (415) 468 6589 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C B And R Construction | Xinh Van Ho | — | (415) 806 9663 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| C B Plumbing | C B Plumbing | — | (415) 517 7709 | Other | San Francisco · San Francisco County | — | — |