| Apt Red LLC | Gary Jay Lane | — | (800) 653 8280 | Other | South San Francisco · San Mateo County | — | — |
| Aquatech Swimming Pools INC | James Abraham Sandoval | — | (650) 315 2523 | Pool | Redwood City · San Mateo County | — | — |
| Aquatic Pool Service | David Collins Decristoferi | — | (650) 593 1543 | Pool | San Carlos · San Mateo County | — | — |
| Aquila Construction | Ronald James Joseph Aquila | — | (650) 281 3125 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Ara Avedis Tehlirian | Ara Avedis Tehlirian | — | (415) 613 7195 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Arana Bay Area Painting INC | Enmer Emmanuel Arana | — | (650) 532 4879 | Windows, patio, painters | Burlingame · San Mateo County | — | — |
| Arbor Homes INC | Gregory Joseph Spalasso | — | (650) 281 4734 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Arbor Resources | Arbor Resources | — | (650) 654 3351 | Tree | San Mateo · San Mateo County | — | — |
| Arborco Tree Service | Christopher Paredes | — | (650) 771 0221 | Other | San Mateo · San Mateo County | — | — |
| Arc Construction & Electric LLC | Tarik Gamal Abouzeid | — | (650) 400 8363 | Electricians | San Carlos · San Mateo County | — | — |
| Archigate Construction | Meysam Rezvani | — | (310) 359 5443 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Arcline Development INC | Yin Yi Zeng | — | (415) 860 6303 | Electricians | Millbrae · San Mateo County | — | — |
| Arcon Builders | Rico Huo | — | (650) 224 0066 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Arcon Construction Corporation | Vladimir Yefim Libov | — | (415) 759 6228 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Area Development INC | Alaghemand Hamid | — | (415) 992 1002 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Aren Electric Co INC | Gerry Bayangos Reyes | — | (650) 754 9420 | Electricians | Daly City · San Mateo County | — | — |
| Arevalo Prime Construction | Marina Galvez | — | (415) 813 0852 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Argonaut Window & Door Inc. | Argonaut Window & Door Inc. | — | (800) 430-7535 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| Argos Construction | Arkhipov Victor | contact@argosconstruction.com | (415) 926 1299 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Argyris Plumbing | Argyris Plumbing | — | (415) 260 9324 | Other | Belmont · San Mateo County | — | — |
| Arias F Electric INC | Calderon Felipe Arias | — | (650) 272 1595 | Electricians | Redwood City · San Mateo County | — | — |
| Aristocrat Construction INC | Sukhovitsky Feliks | — | (650) 333 1804 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Arm Bay | Arm Bay | — | (415) 412 4111 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Arm Construction INC | Martinez Roberto Ambrosio | — | (415) 269 8172 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Armen's Door Company DBA W L Doors | Walter Santos Lara | — | (650) 343 8783 | Other | South San Francisco · San Mateo County | — | — |
| Armor Electric INC | Robert Neill Harkins | — | (650) 787 3459 | Electricians | San Mateo · San Mateo County | — | — |
| Armstrong Structural Solutions | Armstrong Structural Solutions | — | (530) 400 7250 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Arnesen Home & Design | Arnesen Home & Design | — | (650) 580 3025 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Arnolds Door And Operator Service | John Paul Jarvinen | — | (650) 302 0555 | Other | San Bruno · San Mateo County | — | — |
| Arpol INC | Pavel Melentievich Arbatsky | — | (415) 378 9854 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Arreglo Construction INC | Cruz Karina Santa | — | (650) 224 3052 | Electricians | Pacifica · San Mateo County | — | — |
| Arris Build Group INC | George Yun Wah Mak | — | (415) 860 8632 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Arseneault Construction | Marc Andre Arseneault | — | (415) 531 7498 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Art Of Construction INC | Gerardo Gutierrez | — | (650) 871 6791 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Art P Construction | Puchalski Artur | — | (415) 706 2068 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Art Tile | Art Tile | — | (650) 207 8345 | Other | Foster City · San Mateo County | — | — |
| Art's Fixes | Art's Fixes | — | (650) 281 3320 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Art's Martin Doors | Art's Martin Doors | artsmartindoors@gmail.com | (650) 878 1555 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Art's Plumbing | Art's Plumbing | — | (650) 863 6665 | Other | Hillsborough · San Mateo County | — | — |
| Art-cal Painting INC | Arturo Calvario-Valdez | — | (650) 465 7370 | Windows, patio, painters | Redwood City · San Mateo County | — | — |