| Al Jr's Roofing | Albert James Heinicke | — | (415) 672 6171 | Other roofers | South San Francisco · San Mateo County | — | — |
| Al's Carpet | Al's Carpet | — | (650) 201 5405 | Other | South San Francisco · San Mateo County | — | — |
| Al's Carpets | Al's Carpets | — | (650) 355 0640 | Other | Pacifica · San Mateo County | — | — |
| Aladdin Hauling & Demolition | Aladdin Hauling & Demolition | — | (650) 222 4763 | Other | Burlingame · San Mateo County | — | — |
| Alamo Hardwood Floors | Mao Quan Duc | — | (415) 730 4084 | Other | Daly City · San Mateo County | — | — |
| Alan Doell Construction | Alan Robert Doell | — | (925) 922 1001 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Alan J Karcich | Alan J Karcich | — | (650) 864 4970 | Other | San Carlos · San Mateo County | — | — |
| Alan Wong Construction INC | Alan Ming Lun Wong | — | (415) 298 8033 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Alba Construction Services INC | Flavio Steven Alvarez | — | (650) 281 6593 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Albert Bruce R | Albert Bruce R | — | (415) 971 9902 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Albert Hall INC | Rabinovich Albert | info@albert-hall.com | (415) 260 1434 | Other | San Bruno · San Mateo County | — | — |
| Albert Hui | Albert Hui | alberthui@outlook.com | (650) 218 5245 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Alberto Pulido Painting INC | Jose Alberto Pulido | — | (650) 280 7203 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| Alberto S Cortez | Alberto S Cortez | — | (650) 201 6510 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Alberto's Iron Works | Alberto's Iron Works | albertosiron@gmail.com | (650) 755 0244 | Other | Daly City · San Mateo County | — | — |
| Alcaraz Floors | Alcaraz Floors | — | (650) 726 0815 | Other | El Granada · San Mateo County | — | — |
| Alden Construction | Thomas Christian Alden | — | (650) 619 0479 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Aldo Demo And Dig Engineering | Clodoaldo Noraldino Bontempo | — | (415) 368 3150 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Alef Construction Corporation | Alfonso Martin Perez | alefconstruction@aol.com | (650) 508 1569 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Alego Painting INC | Aleyda E Gonzalez | — | (415) 666 5128 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| Alejandro Pantoja | Alejandro Pantoja | — | (650) 704 8572 | Windows, patio, painters | Menlo Park · San Mateo County | — | — |
| Alert Door Service INC | Lynn Susan Lenardon | — | (650) 342 7521 | Other | San Mateo · San Mateo County | — | — |
| Alesia Plumbing And Utilities Services | Jose Guadalupe Castro | — | (650) 766 7486 | Other | Pescadero · San Mateo County | — | — |
| Alex Builder INC | Yong Dong Liu | — | (415) 806 6311 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Alex Chriss | Alex Chriss | — | (650) 245 8080 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Alex J Lang Plumbing Contractor | Alex J Lang Plumbing Contractor | — | (650) 400 6832 | Other | Redwood City · San Mateo County | — | — |
| Alexander Borabo | Alexander Borabo | — | (650) 871 7711 | GC, remodel, ADU | So San Francisco · San Mateo County | — | — |
| Alexander Builders INC | Alexander De Guzman Borabo | interested@domainmarket.com | (650) 871 7711 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Alexander Company | Maryjane A Perez | — | (650) 373 3900 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Alexander Ernesto Navarro | Alexander Ernesto Navarro | — | (415) 312 8505 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Alexander Landaverde | Alexander Landaverde | — | (415) 539 8074 | Other | Colma · San Mateo County | — | — |
| Alexander Roofing | Melvin Alexander Henriquez | sales.alexanderoofing@gmail.com | (650) 454 6718 | Other roofers | Redwood City · San Mateo County | — | — |
| Alfie Holmes Painting | Sarah Anne Caska Holmes | info@alfieholmespainting.com | (650) 348 3780 | Windows, patio, painters | San Mateo · San Mateo County | — | — |
| Alfonso Molina Construction INC | Molina Alfonso | — | (650) 380 0868 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Alfred Joseph Landscaping INC | Gerard Daniel Joseph | — | (650) 366 2331 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| Alftin Construction INC | Angela Christine Alftin | — | (650) 529 0333 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| Ali Sarraf Yazdi | Ali Sarraf Yazdi | — | (805) 630 2900 | GC, remodel, ADU | Westlake · San Mateo County | — | — |
| Aliya's Custom Painting | Aliya's Custom Painting | — | (714) 809 3943 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| All Action Waterdamage INC | Carlos Antonio Gavidia | — | (650) 504 1987 | Other | Foster City · San Mateo County | — | — |
| All Air Mechanical Contractors INC | Arvindbhai Bhagwandas| Tandel Arvind Bhagwan Tandel | — | (650) 615 0248 | HVAC | South San Francisco · San Mateo County | — | — |