| Apex Outdoor Landscape | Gerber Ottoniel Romero Romero | — | (415) 755 8345 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Apperson / Hoog & Associates INC | Jesse Walter Apperson | — | (415) 883 6000 | GC, remodel, ADU | Novato · Marin County | — | — |
| Applied Design Construction | Alexander Timothy Dixon | — | (415) 261 7271 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Ar Plumbing INC | Ludwing Haroldo Vasquez Velasquez | — | (415) 459 1214 | Other | San Rafael · Marin County | — | — |
| Arbor Day Tree Care INC | Edgar Clyde Evans | — | (415) 454 8501 | Tree | Novato · Marin County | — | — |
| Arcangelo Construction | Lara Kiara Conte | — | (415) 531 7528 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Archetype Design Build INC | Keith Allen Dunlop | — | (415) 559 3477 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Architectural Design Carpets | Debra Lynn Duering | — | (415) 458 1717 | Other | San Rafael · Marin County | — | — |
| Architectural Fenestration & Restoration INC | Alan Jerry Felix Zweig | — | (415) 717 8008 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Architectural Sheet Metal Corporation | William Wayne Kolthoff | — | (415) 789 7900 | Other | Tiburon · Marin County | — | — |
| Arctyp Metal Arts | Arctyp Metal Arts | — | (415) 577 8885 | Other | Tiburon · Marin County | — | — |
| Ard Mac Electric INC | Mc Conville Paul | — | (415) 444 6077 | Electricians | San Rafael · Marin County | — | — |
| Ard Mhacha Construction INC | Michael Gerard Kane | — | (415) 410 8990 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Ardito Construction | Ralph Silvio Ardito | — | (707) 953 9602 | Other | San Anselmo · Marin County | — | — |
| Ardmore | Daniel Joseph Fleming | — | (330) 475 2886 | Electricians | Greenbrae · Marin County | — | — |
| Argent Builders | Argent Builders | — | (415) 261 3158 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Arias Electrical Services | Arias Rafael | — | (415) 378 6988 | Electricians | Novato · Marin County | — | — |
| Arka Plumbing | Arka Plumbing | — | (415) 516 0214 | Other | San Rafael · Marin County | — | — |
| Armando Topete Painting INC | Armando Topete | — | (415) 259 9251 | Windows, patio, painters | San Anselmo · Marin County | — | — |
| Armour Construction | Clive Michael Armour | karmour@armourconstruction.com | (415) 867 7731 | GC, remodel, ADU | Novato · Marin County | — | — |
| Armstrong Tree Care | Armstrong Tree Care | — | (415) 505 2670 | Tree | San Rafael · Marin County | — | — |
| Arnold Hassinger | Arnold Hassinger | — | (415) 381 2246 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Arrington Construction Company INC | Martin Joseph Arrington | adam@arringtonconstruction.com | (415) 497 1237 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Arrow Builders INC | Darin Freitag | — | (415) 994 4549 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Arrow Deck & Construction | Gary Vernon Scozzafava | — | (415) 254 9401 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Arruda Construction INC | Nina Gomes Arruda | — | (415) 897 1928 | GC, remodel, ADU | Novato · Marin County | — | — |
| Art@yee Enterprises LLC | Arthur Robert Yee | — | (415) 246 1148 | GC, remodel, ADU | Novato · Marin County | — | — |
| Arteva Outdoor Living | Javier Corona-Leyva | — | (415) 419 7646 | Windows, patio, painters | Novato · Marin County | — | — |
| Artisan Plumbing INC | Thomas Russell Seitz | — | (415) 482 8707 | Other | Fairfax · Marin County | — | — |
| Artist Touch Construction INC | Robin Jamal Dawson | artisttouchconstruction@gmail.com | (415) 505 7233 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Artista Painting & Decorating | Artista Painting & Decorating | — | (415) 306 4540 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Artistic Applications | Artistic Applications | — | (415) 385 5533 | Windows, patio, painters | Novato · Marin County | — | — |
| Artistic License | Artistic License | — | (415) 716 6753 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Artistic Lighting And Electric | Duane Dorsey Johnson | — | (415) 382 9500 | Electricians | Novato · Marin County | — | — |
| Arvand Building Contracting | Sabetian Arvand | — | (415) 419 9533 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Arvand Contracting | Sabetian Ahmad | — | (415) 419 9533 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Asap Demolition | Leandro Righi Duarte | — | (510) 453 9856 | Other | Tiburon · Marin County | — | — |
| Asbestos Control Center | Charles Carlton James | — | (415) 883 7856 | GC, remodel, ADU | Novato · Marin County | — | — |
| Ashfield Construction | Eamonn Thomas Burns | info@ashfieldconstruction.com | (415) 407 2765 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Aspect Builders LLC | David Mylod Royston | hello@aspect-builders.com | (415) 912 7039 | GC, remodel, ADU | San Rafael · Marin County | — | — |