| A 1 Fence Company | Matthew Joseph Tuckett | — | (650) 873 7272 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| A A A Avalon Builder Corporation | Shahin Sazegari | — | (650) 504 9978 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| A A A Christopher Electric INC | Christopher Richard Gay | — | (650) 888 8284 | Electricians | Belmont · San Mateo County | — | — |
| A A Builders & Company | Arturo| Alcanta R Arturo Jr Alcantar | — | (650) 504 4294 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| A A Construction Group INC | Arnoldo Rivera Verduzco | — | (650) 328 1530 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| A A Heating And A/c | A A Heating And A/c | — | (650) 892 9009 | HVAC | Daly City · San Mateo County | — | — |
| A Aleshin's Construction | Anton Alekseyevich Aleshin | — | (559) 250 3658 | GC, remodel, ADU | Foster City · San Mateo County | — | — |
| A And B Painting LLC | Silvana Michelle Pereira | julio@andybryanpainting.com | (650) 759 3457 | Windows, patio, painters | Redwood City · San Mateo County | — | — |
| A And L Electric Company | Rangel Armando | — | (650) 578 1854 | Electricians | San Mateo · San Mateo County | — | — |
| A B Construction Company | David Joseph Barrett | — | (650) 515 6822 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| A B Heagney Metal Fabrication | A B Heagney Metal Fabrication | — | (650) 868 7448 | Other | Brisbane · San Mateo County | — | — |
| A B Landscape | A B Landscape | — | (650) 832 1900 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| A B M 7 Electric | Arnel Bungay Martinez | — | (415) 505 5098 | Electricians | Daly City · San Mateo County | — | — |
| A B P Plumbing INC | Steve James Mc Creadie | — | (408) 757 6267 | Other | Belmont · San Mateo County | — | — |
| A B Plumbing | A B Plumbing | — | (415) 215 5821 | Other | San Bruno · San Mateo County | — | — |
| A Barrios General Building Contractor Painting & Decorating | Abner Asael Barrios | — | (415) 264 6092 | Electricians | Redwood City · San Mateo County | — | — |
| A C A Builders Group INC | Abner Abigail Esquivel Martinez | — | (510) 289 4388 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| A C Earthworks | A C Earthworks | — | (650) 274 8244 | Other | Redwood City · San Mateo County | — | — |
| A C G Construction INC | Charles Allen Graves | — | (650) 345 2082 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| A G C | A G C | — | (415) 722 7711 | Other | Daly City · San Mateo County | — | — |
| A G G General Contractor | A G G General Contractor | — | (650) 465 2363 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| A G Hansen Plumbing | A G Hansen Plumbing | — | (650) 323 4138 | Other | Menlo Park · San Mateo County | — | — |
| A G R Plumbing | A G R Plumbing | — | (650) 921 4956 | Other | San Mateo · San Mateo County | — | — |
| A Green Home | Jack Charles Salvato | — | (650) 400 3600 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| A H Construction | Austin Joseph Harkin | sales@ahconstruction.com | (415) 420 1660 | GC, remodel, ADU | Montara · San Mateo County | — | — |
| A H R Construction | Herrera Gomez Anabell | — | (650) 773 6108 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| A Honey Do List Handyman | A Honey Do List Handyman | — | (650) 678 9472 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| A I M Consolutions INC | Li Hailin | — | (650) 918 8715 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| A J Peet Construction | Adam James Peet | — | (650) 302 2998 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| A K Construction | Andre Victor Kaprielian | — | (650) 343 7335 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| A K Home Improvement INC | Kustura Anatoliy | — | (415) 279 1426 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| A K M Construction | Soe Yee Wai Hin | — | (650) 201 2808 | Electricians | Daly City · San Mateo County | — | — |
| A L B Design & Construction | Allan Levoit Baquilar | — | (415) 533 3988 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| A L M 2 | A L M 2 | — | (650) 622 2832 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| A L P Roofing Corp | Apolinar Antonio Luna-Pacheco | — | (415) 571 6087 | Other roofers | San Bruno · San Mateo County | — | — |
| A L V Construction INC | Ana Luna-Victoria | lee.voege@yahoo.com | (650) 670 0804 | Electricians | Redwood City · San Mateo County | — | — |
| A Mettle Production | A Mettle Production | — | (650) 302 2520 | Other | Pacifica · San Mateo County | — | — |
| A Miracle Plumbing | A Miracle Plumbing | — | (415) 574 7216 | Other | San Bruno · San Mateo County | — | — |
| A N A Building And Design INC | Olga V Ivoilova | — | (408) 202 2231 | HVAC | Menlo Park · San Mateo County | — | — |
| A N R Development | A N R Development | — | (415) 650 8599 | GC, remodel, ADU | Daly City · San Mateo County | — | — |