| Advance Builders | Advance Builders | — | (415) 377 7220 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Advance Building Construction And Development | Eddie Kwok - Keung Yim | — | (415) 244 5302 | GC, remodel, ADU | Foster City · San Mateo County | — | — |
| Advance Systems And Design | Advance Systems And Design | — | (650) 363 8053 | Other | Redwood City · San Mateo County | — | — |
| Advanced Automatic Gates | Advanced Automatic Gates | — | (650) 594 4814 | Other | Belmont · San Mateo County | — | — |
| Advanced Mechanical Services INC | Todd M Boulland | — | (650) 359 3683 | HVAC | Pacifica · San Mateo County | — | — |
| Advanced Solutions Heating And Air Conditioning INC | Bruce David Williams | — | (650) 347 4328 | HVAC | San Mateo · San Mateo County | — | — |
| Advanced Tree Care And Consulting INC | Robert Howard Weatherill | — | (650) 839 9539 | Tree | San Carlos · San Mateo County | — | — |
| Advanced Volume Management LLC | Vijay Hirabhai Patel | — | (650) 520 5259 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Advanced Window Systems | Advanced Window Systems | don@aws650.com | (650) 591 5253 | Windows, patio, painters | Belmont · San Mateo County | — | — |
| Advantage Plumbing Sf INC | Daniel Thomas Walker | — | (415) 342 8135 | Other | South San Francisco · San Mateo County | — | — |
| Advantage Roofing INC | David Charles Taylor | — | (650) 291 6342 | Other roofers | Daly City · San Mateo County | — | — |
| Aether Design | Ami Lior Ben | — | (650) 770 5077 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Afb Plumbing | Afb Plumbing | — | (650) 576 4549 | Other | Pacifica · San Mateo County | — | — |
| Affinitel Communications | Fabio Rogerio Penny | — | (415) 808 7200 | Other | Daly City · San Mateo County | — | — |
| Affordable Quality Electric INC | Efrain Arturo Cruz | — | (415) 412 5708 | Electricians | South San Francisco · San Mateo County | — | — |
| Ag Builders | Ag Builders | — | (510) 432 9612 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Agdg Electric INC | Urias Mardoqueo Portillo | — | (650) 720 3664 | Electricians | Daly City · San Mateo County | — | — |
| Age Lyssand | Age Lyssand | — | (650) 366 5428 | GC, remodel, ADU | Emerald Hills · San Mateo County | — | — |
| Agi Electric INC | Andras Gabriel | — | (650) 364 4865 | Electricians | Redwood City · San Mateo County | — | — |
| Ags Signs | Ags Signs | — | (415) 840 4337 | Other | San Bruno · San Mateo County | — | — |
| Aguilar & Sons INC | Keith Edward Aguilar | — | (650) 344 1400 | Other | Burlingame · San Mateo County | — | — |
| Aguilar Barrios Construction | Josue Abdias Aguilar Barrios | — | (650) 255 8185 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Aguilar Building Company | Lisandro Everardo Sr Aguilar Matias | — | (650) 218 0677 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Agusan Bay Construction | Emmanuel Panlilio Castillo | agusanbayconstructions@gmail.com | (415) 992 2671 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Ahg Pro Painting | Ahg Pro Painting | — | (650) 931 7015 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Ahmed Mohamed Attia Khalil | Ahmed Mohamed Attia Khalil | — | (408) 220 4497 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Aiello Construction Co | Peter Frank Aiello | — | (650) 799 9250 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Aigean Properties INC | Hugh Doherty | — | (650) 892 7484 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Air Conditioner Service Near Me | Air Conditioner Service Near Me | — | (650) 260-6271 | HVAC | San Mateo · San Mateo County | — | — |
| Air Stream HVAC Service | Thomas Frank Sartor | — | (650) 520 7146 | HVAC | Belmont · San Mateo County | — | — |
| Air Temp Company | Marco Antonio Maldonado | — | (650) 591 1004 | HVAC | San Mateo · San Mateo County | — | — |
| Aire Sheet Metal INC | Bobby Eugene Bramlett | — | (650) 364 8081 | HVAC | Redwood City · San Mateo County | — | — |
| Airflow HVAC Solutions | Airflow HVAC Solutions | — | (650) 503-0326 | HVAC | San Mateo · San Mateo County | — | — |
| Aj Gutters | Rodriguez Prisma Rangel | — | (650) 304 5090 | Other | Redwood City · San Mateo County | — | — |
| Aj Landscape Solutions | Yara Isabel Saucedo | office@ajlandscapesolutions.com | (650) 437 3515 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Aj Mobile Auto Glass Specialist San Mateo | Aj Mobile Auto Glass Specialist San Mateo | — | (650) 437-7844 | Windows, patio, painters | San Mateo · San Mateo County | — | — |
| Ak Home Construction INC | Soi Chio Sio | — | (415) 812 8366 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Akshar Development INC | Vijay Hirabhai Patel | — | (650) 333 1886 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Al - Tone Overhead Door INC | Edgar Rolando Velasquez | — | (650) 755 3454 | Other | South San Francisco · San Mateo County | — | — |
| Al De Construction Company | Dean Elio De Bastiani | aldeconstruction@aol.com | (650) 863 0477 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |