| Assistance In Paradise General Contractor INC | Diego Fernandez-Bussy | — | (415) 717 3129 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Associated Electronics Gates | Associated Electronics Gates | — | (415) 454 2936 | Other | Tomales · Marin County | — | — |
| Asvi's Gardening INC | Asvi Waldemar Sr Diaz De Leon | — | (415) 375 2307 | Windows, patio, painters | Novato · Marin County | — | — |
| Atco Pest Control | Atco Pest Control | atcoleads@atcopestcontrol.com | (833) 326-2826 | Pest, tile roofs | Novato · Marin County | — | — |
| Atlantis Interiors | Dan Watson | — | (415) 332 6500 | Other | Sausalito · Marin County | — | — |
| Atlas Building Contractors LLC | Craig David Macquarrie | — | (415) 235 7073 | Electricians | Novato · Marin County | — | — |
| Atlas Landscapes | Atlas Landscapes | — | (415) 380 0604 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Au Gold Construction INC | Alvarado Uriel | info@augoldconstruction.com | (415) 261 4079 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Aurora Cabinets And Countertops INC | Martin John Keith | — | (415) 472 4171 | Other | San Rafael · Marin County | — | — |
| Aussie Roofing INC | Orlando Mario Lucia Guastella | dion42@hotmail.com | (415) 472 2800 | Other roofers | San Rafael · Marin County | — | — |
| Automatic Garage Door Of Marin INC | Anthony Gail Egland | — | (415) 883 0725 | Other | Novato · Marin County | — | — |
| Ava Construction INC | Andrew Santino Miranda | — | (415) 526 6322 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Avery Stewart Concrete INC | Avery Logan Stewart | — | (707) 623 0374 | Other | Novato · Marin County | — | — |
| Avid Electric | Timothy Owen Mcdonald | — | (415) 725 3824 | Electricians | San Rafael · Marin County | — | — |
| Avidgreen Landscaping | Scott Pulver Sherman | — | (415) 461 8477 | Windows, patio, painters | Greenbrae · Marin County | — | — |
| Avila & Wadlington Contractors INC | Gino Bologna Avila | — | (415) 573 8547 | GC, remodel, ADU | Forest Knolls · Marin County | — | — |
| Avilas Construction INC | Alirio Noel Avila | — | (415) 234 6279 | GC, remodel, ADU | Novato · Marin County | — | — |
| Awnco Retractables | Awnco Retractables | — | (415) 999 8188 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Axelson Builders INC | Hieronymous Axelson | — | (415) 686 4804 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Axiom Construction | Marcus Julian Ceniceros | — | (415) 623 9853 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Ay Professional Painting INC | Aurelio Reynaldo Yam | — | (415) 450 8551 | Windows, patio, painters | Novato · Marin County | — | — |
| B & G Glass | Dean Thomas Garcia | — | (415) 883 1910 | Windows, patio, painters | Novato · Marin County | — | — |
| B Barrientos Construction | Byron Humberto Barrientos Vargas | — | (415) 505 8732 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| B G Construction | Brian Stuart Greenstein | — | (415) 806 9520 | GC, remodel, ADU | Novato · Marin County | — | — |
| B L S Better Living Services | Damian Joseph Dagher | — | (415) 755 8675 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| B M C Contractors INC | Brian Thomas Mc Guire | brian@bmccontractors.com | (415) 606 1773 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| B Michael Hayes Const | B Michael Hayes Const | — | (415) 606 3141 | Electricians | Tiburon · Marin County | — | — |
| B Street Builders | B Street Builders | — | (415) 300 7898 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| B Swain Construction | Barry Ira Swain | — | (415) 265 5390 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Ba Squared | Michael Joseph Catalana | info@ba-squared.com | (415) 272 8756 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Babcock Construction | Myles William Babcock | — | (415) 203 4584 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Bachelder And Associates | Mark Hyatt Bachelder | — | (415) 519 8905 | GC, remodel, ADU | Forest Knolls · Marin County | — | — |
| Bachman Construction | Craig Paul Bachman | — | (415) 747 2497 | GC, remodel, ADU | Novato · Marin County | — | — |
| Back To The Roots Landscaping | Back To The Roots Landscaping | — | (415) 246 5784 | Windows, patio, painters | San Anselmo · Marin County | — | — |
| Badger Builders DBA Badger Engineering Builders | Oliver Brent Harris | — | (415) 246 9163 | GC, remodel, ADU | Point Reyes Station · Marin County | — | — |
| Baker Construction | Timothy Andrew Baker | mcgahae@bakerconstruction.com | (415) 672 0864 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Baker Plumbing & Company | Clint Mausisa Baker | — | (510) 932 0227 | Other | Novato · Marin County | — | — |
| Balance Builders INC | Christopher William Simkins | — | (415) 497 9543 | GC, remodel, ADU | Novato · Marin County | — | — |
| Baldenebro Construction INC | Jose Luis Baldenebro Sotelo | — | (415) 497 0511 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Baldwin Electric INC | Dennis Byron Baldwin | eben@eyebytes.com | (415) 897 8900 | Electricians | Novato · Marin County | — | — |