| Bair Renovations | Nadtsalov Bair | office@bairrenovations.com | (408) 899 9575 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Baiyan Construction | Chen Baiyan | — | (415) 939 5936 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Bajada Electric INC | Joseph Charles Bajada | hello@rfuenzalida.com | (415) 760 6497 | Electricians | South San Francisco · San Mateo County | — | — |
| Balboni Electric | Samuel Charles Imber | balboni.electric@gmail.com | (650) 779-8240 | Electricians | Redwood City · San Mateo County | — | — |
| Bana Builders INC | Jahangir Ramezanbeigi | — | (415) 508 9253 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Bantry Bay Construction | Roy David O'sullivan | — | (650) 878 7415 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Barak Electric | Manfredo Isaias Juarez Chun | — | (415) 410 4445 | Electricians | Daly City · San Mateo County | — | — |
| Barbosa Construction INC | Gilberto Barbosa | — | (650) 743 0790 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Barchelle Construction INC | Barry Lerey Gose | — | (650) 892 1915 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Bardsley Construction Incorporated | Robert Arlen Jr Bardsley | — | (408) 479 1797 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Barisone Construction INC | Anthony Mario Barisone | — | (650) 307 2198 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Bark & Build Builders INC | Dennis Walter Hanke | — | (408) 300 9279 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Barker Tech INC | Steven Mitchell Ward | — | (650) 452 9456 | Other | South San Francisco · San Mateo County | — | — |
| Barnoski Painting | Barnoski Painting | customer-care@barnoskipainting.com | (650) 834 0028 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Baron Enterprises | Mark Clyde Baron | — | (650) 255 1110 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Barrera Painting Contractor | Barrera Painting Contractor | — | (650) 875 4053 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Barron Construction INC | Richard | charlie@barronconstruction.com | (415) 678 9744 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Barry Construction | Bo Galen Barry | — | (650) 575 6777 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| Bart's Construction Co | Bartolome Erazo | bartcanmore@gmail.com | (650) 773 5508 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Basic Modular Facilities | Derald Newkirk Norton | — | (415) 699 9124 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Basil Zaru Construction | Basil Salem Zaru | — | (650) 771 3897 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| Basmar Construction | Basile Mario | — | (415) 377 7845 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Bass Electric Company | Jeffrey Jack Jr Yee | — | (415) 295 1600 | Electricians | South San Francisco · San Mateo County | — | — |
| Bastion Construction Services | Timothy Ryan Sterrett | — | (650) 640 9800 | Other | San Carlos · San Mateo County | — | — |
| Bates & Associates Developments INC | Frances Ann Burke | — | (415) 531 1861 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Bathtech Remodeling And Refinishing Company | Russell Walter Morrison | — | (415) 850 1910 | GC, remodel, ADU | Foster City · San Mateo County | — | — |
| Battsooj Ishsuren | Battsooj Ishsuren | — | (650) 245 9975 | Electricians | San Mateo · San Mateo County | — | — |
| Bautista Construction | Andrew Enriquez Bautista | admin@bautista-construction.com | (650) 296 9102 | GC, remodel, ADU | El Granada · San Mateo County | — | — |
| Baxter Construction | Gregory John Baxter | — | (510) 220 5156 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Bay - Con Infrastructure | Phillip Michael Mieszkowski | — | (415) 580 1441 | Other | San Mateo · San Mateo County | — | — |
| Bay Area Climate Control | Bay Area Climate Control | info@bayareaclimatecontrol.com | (510) 391-5597 | HVAC | San Mateo · San Mateo County | — | — |
| Bay Area Custom Homes | Jason Skinner | — | (650) 802 8846 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Bay Area Electric | George Leigh Simpson | info@bayareaelectric.com | (650) 345 5383 | Electricians | San Mateo · San Mateo County | — | — |
| Bay Area Electrical Contractors INC | Jose Jesus Arroyo | — | (650) 776 2879 | Electricians | Redwood City · San Mateo County | — | — |
| Bay Area Electrical Unlimited | Shane Michael Soden | — | (805) 310 7249 | Electricians | Montara · San Mateo County | — | — |
| Bay Area Energy Solutions INC | Tevita Pauleisia Samate | info@bayareaenergysolutions.com | (650) 375 5955 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Bay Area Five Star Roofing | Sandoval Arroyo Leonardo | — | (650) 686 8096 | Other roofers | Redwood City · San Mateo County | — | — |
| Bay Area Home Builders INC | Hadjian Behzad | — | (650) 832 8414 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Bay Area Insulation Services | Marvin Osvaldo Portillo Rodriguez | — | (650) 499 6711 | Other | Redwood City · San Mateo County | — | — |
| Bay Area Paving Co | Cheryl Diane Quinn | — | (650) 787 7453 | Other | San Carlos · San Mateo County | — | — |