| Averill Construction INC | Paul Philip Averill | — | (408) 807 6244 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Avesta Construction | Masih Javanbakht | — | (647) 994 9492 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Avila Builders | Avila Builders | — | (650) 773 0566 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Avila Electric | Robert Joseph Avila | avilaiii@hotmail.com | (650) 245 8753 | Electricians | Half Moon Bay · San Mateo County | — | — |
| Avila Landscape | Avila Landscape | — | (650) 670 0738 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Aztec Electric | Felix J Jimenez | service@aztecelectric.com | (650) 799 2994 | Electricians | Half Moon Bay · San Mateo County | — | — |
| Aztech Maintenance / Development LLC | Michael Anthony Alfaro | — | (415) 850 4500 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Azure 2 Pool Service INC | Ryan Timothy Fuqua | — | (650) 921 9083 | Pool | Daly City · San Mateo County | — | — |
| Azzaro Bros INC | Robert Andrew Azzaro | — | (415) 421 1884 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| B & G Build Group INC | Gregory Lim Tan | — | (415) 290 9895 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| B & L Pool Service | Brad Otto Spruitenburg | — | (650) 888 8636 | Pool | Pacifica · San Mateo County | — | — |
| B & T Painting | B & T Painting | — | (650) 867 5406 | Windows, patio, painters | San Mateo · San Mateo County | — | — |
| B B Construction | Batsuuri Bor | — | (415) 240 6910 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| B B J Electric INC | Thomas John Berrill | bbj@bbjelectric.com | (415) 599 1499 | Electricians | San Bruno · San Mateo County | — | — |
| B C T Development INC | William Frederick Schwarz | info@bctdevelopment.com | (650) 363 2228 | GC, remodel, ADU | Emerald Hills · San Mateo County | — | — |
| B D Square Construction | Sum Matthew | — | (415) 812 6026 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| B G Construction | Vladimir Todorov Todorov | — | (415) 260 5315 | GC, remodel, ADU | Brisbane · San Mateo County | — | — |
| B G Pacific Construction INC | Bart Patrick Gaul | — | (650) 344 5263 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| B G Plumbing | B G Plumbing | bgplumbing77@gmail.com | (650) 481-5246 | Other | Redwood City · San Mateo County | — | — |
| B J Gasphar Builders | B J Gasphar Builders | — | (650) 267 1617 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| B K Bobcat | B K Bobcat | — | (415) 559 4743 | Other | Redwood City · San Mateo County | — | — |
| B L Builders INC | Bradley Loren Thaute | — | (650) 363 2300 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| B Metal Fabrication INC | Barbara Steinebel | bmfab@bmetalfabrication.com | (650) 615 7705 | Other | South San Francisco · San Mateo County | — | — |
| B S H Development INC | Bahador Sam Hariri | — | (415) 233 3543 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| B Uniacke Construction | Brendan William Uniacke | — | (650) 745 0202 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| B V General Construction | Thomas Martin Leyden | — | (650) 274 8571 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| B W H Builder INC | Hong Bo | — | (415) 812 2487 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| B&h Builder INC | Yong H Li | — | (650) 288 2708 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Ba Builders INC | Anthony Kin Hing Lim | info@ba-builders.com | (415) 725 6983 | GC, remodel, ADU | Brisbane · San Mateo County | — | — |
| Baba Builders Co | Afif Fuad Baba | — | (650) 574 8275 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Bac Misael Construction | Esdras Misael Bac Borayo | — | (650) 430 4268 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Baca & Sons Painting INC | Steve Michael Baca | — | (650) 224 1134 | Windows, patio, painters | Foster City · San Mateo County | — | — |
| Bach Construction INC | Hans Michael Bach | — | (650) 344 4844 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Bachmann Woodworking INC | Philippe Gottfried He Bachmann | info@bachmannwoodworking.com | (650) 242 1030 | Other | South San Francisco · San Mateo County | — | — |
| Baez Heating & Cooling INC | Jose Baez | admin@baezheatingcooling.com | (650) 208 1297 | HVAC | Redwood City · San Mateo County | — | — |
| Baf INC DBA Bafd INC | Lori Suzanne Wyzard | — | (650) 358 2580 | Other | San Mateo · San Mateo County | — | — |
| Bagnarol Builders | Bagnarol Builders | — | (650) 613 8528 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Bagwat Ventures LLC | Bagwat Bal | — | (650) 804 5690 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Bahia Commercial Painters | Pedro Alfonso Paez Jimenez | — | (415) 312 4533 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Bahn Fire Protection & Plumbing INC | Phillip Ha Bahn | — | (415) 613 0588 | Other | Brisbane · San Mateo County | — | — |