| Alumni Pool Service | George Michael Flanigan | — | (650) 464 1597 | Pool | San Mateo · San Mateo County | — | — |
| Alvah Contracting LLC | Albert Yu | — | (650) 741 6785 | Electricians | South San Francisco · San Mateo County | — | — |
| Alvarado Hardwood Floors | Alvarado Hardwood Floors | — | (650) 867 0914 | Other | San Mateo · San Mateo County | — | — |
| Alvarado Structural Steel | Luis Alberto Alvarado Hernandez | alvaradostructuralsteel@gmail.com | (650) 271 2690 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Alvarado Tile Stone And Showroom INC | Jairo Alexander Alvarado Escobar | — | (650) 741 6739 | Other | South San Francisco · San Mateo County | — | — |
| Alvaro’s Painting | Alvaro’s Painting | — | (650) 921-1383 | Windows, patio, painters | San Mateo · San Mateo County | — | — |
| Alvas Construction | Alvarado Santiago | — | (650) 784 8633 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Amador General Construction | Oscar Ivan Amador | info@amadorgc.com | (650) 834 6137 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Amador's Drywall | Amador Valle Isaias | — | (415) 756 4958 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Amayo's Painting | Amayo's Painting | — | (415) 333 8313 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Amazing Tile Works | Amazing Tile Works | — | (650) 242 2204 | Other | Burlingame · San Mateo County | — | — |
| Ambrose Flooring | Ambrose Flooring | — | (650) 464 7224 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| American Builders | American Builders | — | (916) 316 1766 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| American Chimney Services | Joseph Roy Pirini | — | (650) 583 2393 | Other | South San Francisco · San Mateo County | — | — |
| American Construction & Trade Specialists INC | James Cheng | — | (650) 222 3720 | HVAC | Millbrae · San Mateo County | — | — |
| American Eagle Roofing & Sheetmetal INC | David Troy Helgoth | — | (650) 571 7663 | Other roofers | San Mateo · San Mateo County | — | — |
| American Heritage Construction | Jack Arman Lewis | — | (650) 400 6371 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| American Home Renewal INC | Christopher Joseph Spilly | — | (650) 553 9054 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| American Honor Builder INC | Cheng Qu Miao | americanhonorbuilder@gmail.com | (415) 350 0023 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| American Plumbing & Drain | American Plumbing & Drain | — | (650) 465 3887 | Other | San Mateo · San Mateo County | — | — |
| American Remodelers INC | Ryan Rhett Houston | ryan@americanremodelers.com | (650) 307 3221 | GC, remodel, ADU | El Granada · San Mateo County | — | — |
| American Windows Center INC | Kobzanets Mark | — | (650) 754 1110 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Americana Construction Services | Leonard Joseph Nordeman | — | (650) 290 9008 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Amg Custom Painting INC | Hernandez Eduardo Lara | — | (650) 679 2650 | Windows, patio, painters | Foster City · San Mateo County | — | — |
| Amherst INC | Robert Waldron Mooring | — | (650) 375 8226 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Amiari INC | Amiri Arash | ari@amiari.com | (650) 667 9493 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Ammenti Enterprises | David Anthony Ammenti | — | (650) 578 8204 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Amoroso Overwatch Jv | S J Construction Co LLC Amoroso | — | (650) 654 1900 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Amp Electric | Nick Lauren Boscacci | — | (650) 444 1963 | Electricians | Redwood City · San Mateo County | — | — |
| Ampex Engineering & Construction INC | Jose Garcia | — | (415) 730 7576 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Amx Plumbing | Amx Plumbing | — | (415) 688 5358 | Other | Daly City · San Mateo County | — | — |
| Anchartechahar Construction | Anchartechahar Roger | — | (650) 421 1832 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| And Construction | Andrew John Carl | — | (650) 898 4478 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Anderton Construction | Robert Gregory Anderton | — | (650) 787 7569 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Andes Roofing Corp | Manuel Jesus Baylon Leon | baylonmanuel@gmail.com | (650) 995 3565 | Other roofers | Redwood City · San Mateo County | — | — |
| Andino Construction | Delmer Ernesto Andino-pastrana | — | (415) 374 3969 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Andonian Construction | Andonian Mouchegh | — | (650) 333 7482 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Andrada Remodeling | Andrada Remodeling | — | (650) 302 4100 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Andre Leiro Construction | Haakon Andre Leiro | — | (650) 504 3413 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Andre M Larricq Construction | Andre Michel Larricq | — | (650) 745 6379 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |