| Bk Raingutters | Bk Raingutters | — | (650) 271 2573 | Other | Belmont · San Mateo County | — | — |
| Bknoxbuilt INC | Brian Crittinton Knox | — | (650) 339 9169 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Black Sea Builders | Black Sea Builders | — | (650) 288 2068 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Blacktop Paving INC | Dominic Edward Foti | phil@blacktoppaving.com | (650) 364 1670 | Other | Redwood City · San Mateo County | — | — |
| Blackwolf Tile | Blackwolf Tile | — | (628) 241 9737 | Other | Daly City · San Mateo County | — | — |
| Blanchard's Sheet Metal | Blanchard's Sheet Metal | — | (415) 508 1074 | Other | Pacifica · San Mateo County | — | — |
| Blaze | Bruce Joel Weitzman | — | (415) 495 2002 | Other | Burlingame · San Mateo County | — | — |
| Blazquez Drywall | Blazquez Drywall | — | (650) 834 3495 | Other | Daly City · San Mateo County | — | — |
| Bleyle Elevator INC | Sophie Margaret Guntren | info@bleyleelevator.com | (650) 359 7580 | Other | Pacifica · San Mateo County | — | — |
| Bloc Real Estate And Construction | Anthony John| Batshon Tony Batshon | — | (415) 845 9184 | Electricians | Hillsborough · San Mateo County | — | — |
| Blu World Construction | Shaheen Ali Shahmirza | — | (650) 455 9221 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Blue J Construction | Neil Stewart Gomoluh | — | (650) 867 7991 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Blue Moon Plumbing | Blue Moon Plumbing | — | (650) 771 5347 | Other | Redwood City · San Mateo County | — | — |
| Blue Mule Builders INC | Raymond Tom Harless | impallari@gmail.com | (650) 541 6400 | GC, remodel, ADU | La Honda · San Mateo County | — | — |
| Blue Ocean Painting | Blue Ocean Painting | — | (650) 580 8378 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| Blue Sky Designs INC | Kenneth Lee Coverdell | — | (650) 726 5990 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Blue Sky Pool Services INC | Gabriel Jimenez Ortiz | — | (650) 533 8626 | Pool | Redwood City · San Mateo County | — | — |
| Blue Tree Construction INC | Antonio Manuel Miras | — | (650) 576 2991 | Electricians | Pacifica · San Mateo County | — | — |
| Bluebird Company LLC | Chung John | — | (650) 440 1130 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Blueprint Construction Builders Incorporated | Deji Liu | — | (628) 777 9027 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Bm Construction & Renovation INC | Benny Morales | — | (650) 200 7788 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bmc Construction | Brandon Michael Cavan | — | (650) 773 2785 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Bmh Electric LLC | Brian Matthew Hanson | impallari@gmail.com | (650) 218 9348 | Electricians | San Carlos · San Mateo County | — | — |
| Bmp Construction | Barry Martin Power | — | (650) 766 2107 | GC, remodel, ADU | Montara · San Mateo County | — | — |
| Bms Garage Doors And Gates INC | Meshulami Dvir | — | (408) 620 4815 | Other | Redwood City · San Mateo County | — | — |
| Board Construction | Dwaine P Board | — | (425) 922 0659 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bob Wright Electric | Bobbie Randy Wright | — | (415) 235 8302 | Electricians | Daly City · San Mateo County | — | — |
| Bob's Handyman & Repair Service | Robert Charles Miller | — | (650) 490 0128 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Bobby - The Painter | Bobby - The Painter | — | (510) 928 5447 | Windows, patio, painters | Pacifica · San Mateo County | — | — |
| Bodas Construction INC | Bodas Bryan | info@bodasconstruction.com | (650) 479 1500 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Bodnar Heating & Air Conditioning INC | Heather Lynette Bodnar | — | (650) 368 4408 | HVAC | Redwood City · San Mateo County | — | — |
| Boicelli Cabinets INC | Daniel Silvio Boicelli | — | (650) 368 5078 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Bolar Ceilings | Robert Thomas Iii Davies | — | (650) 593 3528 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Bolaria Construction | Jagtinder Singh Bolaria | — | (650) 274 6208 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Bold Painting LLC | Jesus Angel Leiva Joachin | name@beispiel.de | (415) 336 8072 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Bolung Lee Construction | Lee Bo Lung | — | (415) 321 9213 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Bonanza Construction | Malozsak Louis | — | (650) 533 7045 | Electricians | Woodside · San Mateo County | — | — |
| Boncore Builders INC | Dominick Boncore | — | (650) 200 6292 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Bonilla Construction | Miguel Angel Bonilla | impallari@gmail.com | (415) 806 6479 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Bonomi Cabinets | Bonomi Cabinets | — | (415) 314 7879 | Other | San Carlos · San Mateo County | — | — |