| Bay Area Plumbing & Heating | Lance Tracy Eastman | — | (650) 508 0522 | HVAC | Redwood City · San Mateo County | — | — |
| Bay Area Pools INC | Christopher James Bonomi | — | (650) 347 7516 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Bay Area Re-roofing INC | Vicky Diane Martinez | — | (650) 593 0116 | Other roofers | Belmont · San Mateo County | — | — |
| Bay Area Refacing | Bay Area Refacing | billingsupport@technodreamcenter.com | (650) 454 0754 | Other | San Mateo · San Mateo County | — | — |
| Bay Area Rooter And Plumbing | Bay Area Rooter And Plumbing | — | (408) 930 6608 | Other | Millbrae · San Mateo County | — | — |
| Bay Area Sliding Door Repair INC | Jeffrey Dean Anderberg | info@bayareaslidingdoorrepair.com | (650) 333 5893 | Other | Pacifica · San Mateo County | — | — |
| Bay Area Stump Busters LLC | Steven Scott Jester | — | (650) 921 1778 | Tree | So San Francisco · San Mateo County | — | — |
| Bay Area Sunrooms INC | Joseph Michael Gottula | — | (650) 341 6201 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Bay Area Tile Pros | Bay Area Tile Pros | — | (415) 573 7542 | Other | San Mateo · San Mateo County | — | — |
| Bay Area Tree Company INC | Alexander Louis Carignan | — | (650) 357 1229 | Tree | San Mateo · San Mateo County | — | — |
| Bay Area Water Heaters LLC | Christopher Paul Guslani | — | (650) 597 2332 | Other | San Carlos · San Mateo County | — | — |
| Bay Area Window Pros | Isaak Grinberg | — | (650) 235-1006 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Bay Building & Construction INC | William Timothy Anderson | — | (650) 954 6880 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Bay Cities Development | Bay Cities Development | — | (650) 333 6420 | Other roofers | South San Francisco · San Mateo County | — | — |
| Bay Cities Electric | Miklos Illes Kovacs | — | (650) 358 3966 | Electricians | San Mateo · San Mateo County | — | — |
| Bay City Garage Doors | Bay City Garage Doors | — | (650) 952 7879 | Other | South San Francisco · San Mateo County | — | — |
| Bay City Security Specialist | Bay City Security Specialist | service@baycitysecurityspecialist.com | (650) 274 9725 | Alarm and generators | San Bruno · San Mateo County | — | — |
| Bay Coat Painting | Fausto Jose Marquez Avalos | — | (415) 624 9628 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Bay Counties Construction Services INC | Anguiano Alexandro | — | (415) 377 3362 | GC, remodel, ADU | Brisbane · San Mateo County | — | — |
| Bay Demolition INC | Hermes Henrique Moncaio De Araujo Muniz | — | (650) 737 2877 | Other | Foster City · San Mateo County | — | — |
| Bay Floor Crafters | Bay Floor Crafters | agustinamingote@gmail.com | (415) 694 0827 | Other | Daly City · San Mateo County | — | — |
| Bay Flooring Solutions | Bay Flooring Solutions | — | (650) 922 4463 | Other | Pacifica · San Mateo County | — | — |
| Bay General Contractor LLC | Hoang Chieu Nguyen | — | (650) 222 5732 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Bay Home Development Construction INC | Xiaochuang Lin | — | (415) 539 6567 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Bay Laurel Construction INC | Oscar Alfonso Perez Acena | oscar@baylaurelconstruction.com | (650) 248 9994 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bay Lighting And Power Company | Brenda Melisa Rojas-cruz | — | (650) 750 4800 | Electricians | Menlo Park · San Mateo County | — | — |
| Bay Native Builder | Bay Native Builder | — | (650) 307 9706 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Bay Plumbing And Rooter INC | Jonathan Edward Burnett | — | (650) 367 9493 | Other | Redwood City · San Mateo County | — | — |
| Bay Pointe Landscape INC | Jaurigui Steven | — | (650) 348 6372 | Windows, patio, painters | Belmont · San Mateo County | — | — |
| Bay Steam & Sauna | Brian Michael Petterson | — | (415) 819 6778 | HVAC | Daly City · San Mateo County | — | — |
| Bay View Roofing INC | Brian Joseph Perez | info@bayviewroofing.com | (408) 705 0059 | Other roofers | Redwood City · San Mateo County | — | — |
| Bay West Builders | Gray Derek | — | (650) 216 9600 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Bay West Home INC | Derek Gray | — | (650) 216 9600 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Baycities Roofing Corp | Mauro Adrian Bailon | — | (650) 364 3243 | Other roofers | Redwood City · San Mateo County | — | — |
| Baycoast Electric & Construction Co | Hernan O'ryan Castro | — | (650) 290 0239 | Electricians | Daly City · San Mateo County | — | — |
| Bayhill Heat & Air INC | Ricardo Prospero Valderrama | — | (650) 212 7600 | HVAC | San Mateo · San Mateo County | — | — |
| Bayline Mechanical INC | Rose Marie Caracciolo | — | (415) 648 1225 | Other | S San Francisco · San Mateo County | — | — |
| Bayline Painting & Wallcovering INC | Anthony Frank Fernandes | — | (650) 822 7711 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Baypro Plumbing | Baypro Plumbing | — | (925) 395 8715 | Other | Pacifica · San Mateo County | — | — |
| Bayshore Landscaping | Bayshore Landscaping | — | (650) 716 7231 | Windows, patio, painters | Redwood City · San Mateo County | — | — |