| Bullzeye Installation | Jeffrey Edwin Swenson | — | (650) 363 1163 | Other | Redwood City · San Mateo County | — | — |
| Burch Brothers Incorporated | Robert William Peek | — | (650) 345 7919 | Other | Belmont · San Mateo County | — | — |
| Burgess Browne Wallcovering Designs | Burgess Browne Wallcovering Designs | — | (650) 704 2490 | Other | Redwood City · San Mateo County | — | — |
| Buri Buri Plumbing INC | Richard Raymond Campos | rich@buriburiplumbing.com | (650) 681 2874 | Other | South San Francisco · San Mateo County | — | — |
| Burke Roofing Company | Robert Harry Burke | — | (650) 996 9680 | Other roofers | Half Moon Bay · San Mateo County | — | — |
| Burlingame Glass Company | Michael John Dickinson | — | (650) 343 1811 | Windows, patio, painters | Burlingame · San Mateo County | — | — |
| Burlingame Kitchens & Bath | Burlingame Kitchens & Bath | — | (650) 576 4413 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Burlingame Stone & Tile INC | David James Matovich | — | (650) 796 1554 | Other | Burlingame · San Mateo County | — | — |
| Burnbot INC | Brittany Lee Black | info@burnbot.com | (503) 847 1328 | Other | South San Francisco · San Mateo County | — | — |
| Burnett Landscape & Development INC | Donna Cecile Davis-Burnett | — | (650) 591 1267 | Windows, patio, painters | Belmont · San Mateo County | — | — |
| Burt Remodeling | Burt Remodeling | — | (650) 787 7880 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Burwell Construction | Brian Carter Burwell | — | (650) 918 2615 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Butler Construction Owner's Representation | Brent Christopher Butler | — | (650) 333 9888 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Bvr Painting INC | Byron Jesus Ramos Funez | — | (415) 240 6551 | Windows, patio, painters | Colma · San Mateo County | — | — |
| By The Mark | By The Mark | — | (415) 706 3866 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| C & C General Engineering INC | Kung Chang | — | (415) 317 9398 | HVAC | Millbrae · San Mateo County | — | — |
| C & C Painting | C & C Painting | — | (415) 279 6845 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| C & H Plumbing Co | Cui Hong | — | (510) 388 8126 | Other | Daly City · San Mateo County | — | — |
| C & J Roofing Company INC | Cosmas Alexander Giannoulis | — | (650) 583 5998 | Other roofers | South San Francisco · San Mateo County | — | — |
| C A Electric | Carlos Eduardo Alhadas | — | (650) 576 1991 | Electricians | Millbrae · San Mateo County | — | — |
| C B Enterprises | Christopher David Brorsen | — | (650) 222 3687 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| C B Showers | Silke Sionides | sales@cbshowers.com | (650) 593 6997 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| C B W Construction | Calvin Chi Wong | benw@cbwconstruction.com | (415) 810 3216 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| C B W Construction INC | Calvin Chi Wong | benw@cbwconstruction.com | (415) 810 3216 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| C E J Construction LLC | Cesar Ramos Lozada | jtrevino@cejconstruction.com | (415) 533 2220 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| C E O Steel Fabrication INC | Charles Elvin Ogren | — | (650) 599 9115 | Other | Redwood City · San Mateo County | — | — |
| C F Archibald Paving INC | Curtis Franklin Archibald | — | (650) 364 3045 | Other | Redwood City · San Mateo County | — | — |
| C F Y Construction INC | Margarita Medina | — | (415) 361 7671 | Other roofers | Daly City · San Mateo County | — | — |
| C G H Painting INC | Raul Gutierrez-Garcia | — | (650) 223 4798 | Windows, patio, painters | So San Francisco · San Mateo County | — | — |
| C G Moving Company INC | Carlos Alberto Gonzalez Olivares | — | (925) 458 4680 | Other | South San Francisco · San Mateo County | — | — |
| C H Bull Co | Charles Anderson Bull | — | (650) 837 8400 | Other | South San Francisco · San Mateo County | — | — |
| C H S Construction INC | Shao Chi - Hwa | — | (650) 515 1748 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| C H S Painting & Decorating INC | Charles Hugh Stephenson | — | (650) 740 0518 | Windows, patio, painters | Burlingame · San Mateo County | — | — |
| C J E Heating & Air Conditioning | Cortland John Einspahr | — | (650) 235 0823 | HVAC | Redwood City · San Mateo County | — | — |
| C K Construction | Qi Hua Liang | — | (415) 971 0698 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| C K S | Deanna Aleese Centurioni | — | (415) 948 9979 | Other | Pacifica · San Mateo County | — | — |
| C N D R Construction INC | Cender Ivan Rosales Lima | — | (510) 776 8634 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| C N F Construction Co | Mark Anthony Sanders | — | (415) 377 8198 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| C R Gonzales | C R Gonzales | — | (650) 333 9819 | Other | Belmont · San Mateo County | — | — |
| C R Greenwald Construction | Chad Raymond Greenwald | — | (650) 619 9042 | GC, remodel, ADU | El Granada · San Mateo County | — | — |