| A C Bonifacio Const Co | Aldrey Cano Bonifacio | — | (415) 810 9465 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A C Contracting | Covarrubias Adrian | — | (415) 297 4687 | Other | San Francisco · San Francisco County | — | — |
| A Classic Brush | A Classic Brush | — | (415) 706 9997 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| A Coat Above Painting | A Coat Above Painting | — | (415) 710 5467 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| A Construction Co | Ricardo Josafat Colin Castillo | — | (408) 784 2345 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A Daniele & Company | Anthony Thomas Daniele | — | (707) 766 4235 | HVAC | San Francisco · San Francisco County | — | — |
| A E W Engineering INC | Kenneth Ping-sang Leung | — | (415) 495 8400 | Other | San Francisco · San Francisco County | — | — |
| A G D Construction | Antonio Geraldo Davis | — | (415) 832 9304 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A G L Engineering INC | Christopher Ka Yui Wu | — | (415) 760 0015 | Electricians | San Francisco · San Francisco County | — | — |
| A G Quality Plumbing | Agustin Cruz Garcia | — | (415) 824 2517 | Other | San Francisco · San Francisco County | — | — |
| A G River Wood Windows & Doors 900 | A G River Wood Windows & Doors 900 | — | (415) 648-8535 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| A General Engineering Company | Alejandro Hernandez | — | (510) 734 4666 | Other | San Francisco · San Francisco County | — | — |
| A H B Construction | Alexander Harrison Burr | — | (406) 281 1451 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A J Electric | John Paul Cannon | — | (415) 586 0191 | Electricians | San Francisco · San Francisco County | — | — |
| A J O Group Build INC | Giuseppe Sircana | — | (415) 758 2085 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A M C Builders INC | Martin Vasquez-Ramirez | — | (415) 423 4399 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A M F K Industries INC | Andrew Eunkyu Kim | — | (415) 390 5804 | Other | San Francisco · San Francisco County | — | — |
| A M K Builders | A M K Builders | — | (415) 235 3155 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A M Rocca INC | Annette Marie Rocca | — | (415) 239 0484 | Electricians | San Francisco · San Francisco County | — | — |
| A M West Mechanical INC | Lutsker Sam | info@amwestmechanical.com | (415) 254 2931 | Other | San Francisco · San Francisco County | — | — |
| A Mc Carthy Engineering INC | Angus Fursey Mc Carthy | — | (415) 269 1780 | Other | San Francisco · San Francisco County | — | — |
| A P R Service | Ruben Cristobal Tse | — | (415) 370 9221 | Other | San Francisco · San Francisco County | — | — |
| A Plumbing | A Plumbing | — | (415) 336 5098 | Other | San Francisco · San Francisco County | — | — |
| A Plumbing Company | Zhang Guan Dong | — | (415) 713 3186 | Other | San Francisco · San Francisco County | — | — |
| A Plus Garage Door Corp | Edgar David Nolasco | — | (415) 386 2136 | Other | San Francisco · San Francisco County | — | — |
| A R Electric | Alexander Leonidovich Rozentsvayg | — | (650) 238 8484 | Electricians | San Francisco · San Francisco County | — | — |
| A R G Conservation Services | David Paul Wessel | — | (415) 828 1451 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A R Plumbing | A R Plumbing | — | (415) 312 1751 | Other | San Francisco · San Francisco County | — | — |
| A Ruiz Construction Co & Assoc INC | Antonio Ruiz | — | (415) 647 4010 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A S P Construction & Development | Saffarpour Arash | — | (800) 900 9201 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A T D Tile | A T D Tile | — | (415) 225 5340 | Other | San Francisco · San Francisco County | — | — |
| A Tech Roofing INC | Juliana Sunmi Yoo | — | (415) 757 0106 | Other roofers | San Francisco · San Francisco County | — | — |
| A V A | A V A | — | (415) 317 0350 | Other | San Francisco · San Francisco County | — | — |
| A Whole New Light | A Whole New Light | candles@awholenewlight.com | (415) 412 8960 | Electricians | San Francisco · San Francisco County | — | — |
| A&m Construction & Development INC | Alfred Chungto Lee | — | (415) 309 3623 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A&m Construction & Remodeling LLC | Ashley Weiping Lin | — | (207) 415 0247 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A+g Design+build | A+g Design+build | — | (415) 235 3760 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A-1 Dynamic Builders INC | Jianguo Li | — | (415) 770 9736 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A-arbues Construction | Mauricio Alexander Pena Arbues | — | (628) 468 1760 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A1 Construction Group Corporation | Adam Romuald Lesny | — | (415) 722 8774 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |