| Bayshore Plumbers | Jimenez Samuel | solutions@bayshoreplumbers.com | (650) 323 6464 | Other | Redwood City · San Mateo County | — | — |
| Bayside Equipment Company | Richard William Slade | — | (650) 368 3955 | Electricians | Redwood City · San Mateo County | — | — |
| Bayside Fire Protection INC | Steven Joseph Barrett | kim@baysidefireprotection.com | (225) 773 6363 | Other | Moss Beach · San Mateo County | — | — |
| Bayside Mechanical INC | Mazen George Tawasha | — | (650) 578 9080 | HVAC | Foster City · San Mateo County | — | — |
| Bayside Painting INC | Roman Jeremias Vasquez Bravo | info@baysidepainting.com | (650) 532 4024 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bayside Printed Products | Dominic Vincent Nasser | — | (650) 742 0660 | Other | South San Francisco · San Mateo County | — | — |
| Baytown Construction | Claudio Javier | — | (650) 991 0641 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Bayview Construction & Painting INC | Andreas E Tzortzis | — | (415) 740 2700 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Bayview Iron Works INC | Raquel Elizabeth Zaparolli | bayviewiron@gmail.com | (415) 822 1610 | Other | San Bruno · San Mateo County | — | — |
| Bayview Landscaping INC | William Ernesto Avalos Galicia | info@bayviewlandscaping.com | (650) 518 2950 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Baywest General Builder Corporation | Peter Gregory Comaroto | — | (650) 787 1743 | Electricians | Burlingame · San Mateo County | — | — |
| Baywood Flooring INC | Dolgio Natsagdorj | — | (415) 317 5038 | Other | San Mateo · San Mateo County | — | — |
| Bayworks Construction INC | Brendan Anthony Murphy | — | (650) 699 0574 | Electricians | San Mateo · San Mateo County | — | — |
| Be & Bd Restoration Consulting And Referrals LLC | Jonathan Gerardo Guerrero Olivares | — | (650) 518 4653 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Beach And Bay Development LLC | Joshua Mark Portner | — | (213) 804 3702 | GC, remodel, ADU | Portola Valley · San Mateo County | — | — |
| Beacon Electric LLC | Stephen Louis Jr Ingelfinger | — | (650) 455 2697 | Electricians | San Carlos · San Mateo County | — | — |
| Beale Construction | Richard John Beale | — | (650) 465 5000 | GC, remodel, ADU | Hillsborough · San Mateo County | — | — |
| Beals Martin And Associates INC | Dwight Arthur Ortmann | — | (650) 364 8141 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bear Construction Enterprises INC | Barry Robert Chandler | — | (650) 924 3009 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Bear Flag Ironworks LLC | Sean Alexander Santana | sean@bearflagironworks.com | (415) 385 5155 | Other | Pescadero · San Mateo County | — | — |
| Beau Finato Construction | Landon Swanson Finato | — | (650) 965 2577 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Beau Monde Fine Floors INC | Michael Anthony Kazarian | — | (650) 654 7703 | Other | Belmont · San Mateo County | — | — |
| Beauty Home Construction INC | Vasili Metelitsa | — | (916) 832 5491 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Beb Construction | Bryan Edward Boyle | — | (650) 474 1030 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bedigian Construction | Harry Peter Bedigian | — | (650) 346 9510 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bee Daly Electric INC | Christopher Kawika Daly | — | (650) 307 7682 | Electricians | South San Francisco · San Mateo County | — | — |
| Begadon Welding & Fabrication | Begadon Welding & Fabrication | — | (415) 483 6181 | Other | Half Moon Bay · San Mateo County | — | — |
| Behrens & Curry INC | J Spencer Curry | — | (650) 631 2909 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Behzad Aflak | Behzad Aflak | — | (650) 766 1987 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Bejar Stone Works | Bejar Stone Works | — | (650) 290 1355 | Other | South San Francisco · San Mateo County | — | — |
| Bel Carlos Plumbing | Bel Carlos Plumbing | — | (650) 574 2800 | Other | San Mateo · San Mateo County | — | — |
| Bel Construction Company | Paul Christopher Lee | — | (650) 280 8688 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Beldv INC | Dmitrii Beliaev | — | (650) 245 9224 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Bell Fire And Life Safety | Marc Edward Belluomini | — | (650) 580 5306 | Electricians | Pacifica · San Mateo County | — | — |
| Bell Plumbing Of San Mateo INC | Greg Preston Dixon | — | (650) 697 3000 | Other | San Carlos · San Mateo County | — | — |
| Bell's & Biddle Landscaping | David Alexander Brindle | — | (650) 834 0526 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| Bella Casa Construction INC | Jose Gilberto Cardoso Mendez | — | (650) 421 6673 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bellanti Plumbing INC | Ronald Joseph Bellanti | accounting@bellantiplumbing.com | (650) 588 2990 | HVAC | So San Francisco · San Mateo County | — | — |
| Belmont Painting & Decoration INC | Juan Manuel Gamino | — | (650) 346 8397 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Belmont Pioneer | Belmont Pioneer | — | (650) 592-5987 | Windows, patio, painters | Belmont · San Mateo County | — | — |