| 101 Plumbing Heating And Cooling | Felix De Jesus Gonzalez Escobar | — | (415) 488 7021 | HVAC | Novato · Marin County | — | — |
| 101 Refrigeration Service | Ahmadie Atef | — | (415) 755 3168 | HVAC | San Rafael · Marin County | — | — |
| 123 - Floor INC | William Brent Powell | — | (415) 485 1230 | Other | San Rafael · Marin County | — | — |
| 24 Seven Construction LLC | Loic Stephan Humbert | — | (415) 497 1333 | GC, remodel, ADU | Novato · Marin County | — | — |
| 2K Builders LLC | Thomas Wayne Jordan | — | (541) 731 3856 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| 38 Degrees North Latitude Builders INC | Paul Flores Blickman | — | (415) 456 0937 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| 4ever Good Painting INC | Misael Antonio Sr Hernandez Huinac | — | (415) 574 8158 | Windows, patio, painters | San Rafael · Marin County | — | — |
| 5 Star Via All Star Fire Protection | Zebarjadi Farhad | — | (415) 596 0410 | Other | Novato · Marin County | — | — |
| 5 Stars Painting | 5 Stars Painting | — | (415) 419 4724 | Windows, patio, painters | San Anselmo · Marin County | — | — |
| 57 Electric | Mark Anthony Heller | — | (415) 786 4311 | Electricians | Fairfax · Marin County | — | — |
| 777 Plumbing INC | Jorge Sanchez | — | (415) 847 5995 | Other | Greenbrae · Marin County | — | — |
| A & V Services | Alexander Gregory Sharp | info@a-v-services.com | (415) 725 1222 | GC, remodel, ADU | Novato · Marin County | — | — |
| A A A Builders Corp | Mustafa Juma Abuhalawa | — | (415) 686 0300 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| A B Supply INC | La Cruz Jaime De | — | (415) 251 9365 | GC, remodel, ADU | Novato · Marin County | — | — |
| A C L Plumbing & Service | Jose Alejandro Castillo Lugo | — | (415) 209 4544 | Other | Novato · Marin County | — | — |
| A C Services Landscape Maintenance INC | Gustavo Adolfo Vidalon | — | (415) 827 3044 | Windows, patio, painters | Novato · Marin County | — | — |
| A Car For You INC | Scott Gordon Brauninger | — | (415) 519 5180 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| A Complete Drywall Company | Michael Blake Mayock | — | (415) 456 9306 | Other | San Rafael · Marin County | — | — |
| A Fix Construction | Darren Patrick Fix | — | (707) 228 0785 | Other | Novato · Marin County | — | — |
| A G C I INC | Ruben Mario Arce | — | (415) 785 7977 | GC, remodel, ADU | Greenbrae · Marin County | — | — |
| A G Construction | Gonzalez Farias Alejandro | — | (415) 532 4511 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| A K A Electric INC | Kevin Dennis Kroner | — | (415) 898 9896 | Electricians | Novato · Marin County | — | — |
| A L Electric | Lusinchi Antonio | — | (415) 259 8386 | Electricians | San Rafael · Marin County | — | — |
| A L Martin Construction INC | Alexander Leo Martin | — | (415) 867 4551 | GC, remodel, ADU | Inverness · Marin County | — | — |
| A M Electric | Andrew Wood Moore | — | (415) 299 7297 | Electricians | Corte Madera · Marin County | — | — |
| A Packard Corporation | Charles Davis Allen | apackard.cvsui@slmail.me | (415) 888 8202 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| A R C Restoration & Waterproofing INC | Gary Charles Miller | — | (415) 453 7000 | Other roofers | San Rafael · Marin County | — | — |
| A Shield Advanced Protection | A Shield Advanced Protection | — | (415) 238 7804 | Other | Novato · Marin County | — | — |
| A T S Integration INC | Michael Haydn Pedrick | — | (415) 499 3500 | Electricians | San Rafael · Marin County | — | — |
| A Tureck Construction INC | Alexander Samuel Tureck | — | (650) 289 8118 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| A V Custum Cabinetry | A V Custum Cabinetry | — | (415) 827 4618 | Other | Novato · Marin County | — | — |
| A1 Abatement Group INC | Norman Ronald Bautista | — | (415) 479 0600 | Other | San Rafael · Marin County | — | — |
| A1 Bayarea Landscape INC | Lucio Patricio Calderon Escobar | — | (415) 717 9509 | Windows, patio, painters | San Rafael · Marin County | — | — |
| A1a Garage Door Service And Installation | Colin Alexander Thomas | — | (408) 205 5251 | Other | Novato · Marin County | — | — |
| A2c Construction INC | Rizo David Melendez | — | (415) 306 1571 | GC, remodel, ADU | Novato · Marin County | — | — |
| Aaero Heating & Sheet Metal INC | Virginia Ann Milano | — | (415) 897 4187 | HVAC | Novato · Marin County | — | — |
| Aaron Hirschfeld Construction LLC | Aaron Daniel Hirschfeld | — | (415) 559 8531 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Abacus Group Builders INC | Charles Brown Iii Voorhis | — | (415) 927 0667 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Abans Construction | Cesar Ricardo Aban Caamal | — | (415) 261 0189 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Abbey Builders | Abbey Builders | enquiries@abbeybuilders.org.uk | (415) 472 2910 | GC, remodel, ADU | San Rafael · Marin County | — | — |