| Arita Home Services LLC | Carlos E Arita Munguia | — | (707) 217 5434 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ark Builders | Matthew Franklin Barna | specifydomain@gmail.com | (707) 889 6425 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Arkes Construction | Pete David Arkes | — | (707) 824 0640 | GC, remodel, ADU | Graton · Sonoma County | — | — |
| Armando's Landscape Service INC | Armando Jr Sanchez Lugo | — | (707) 583 3756 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Armando's Masonry | Armando's Masonry | — | (707) 322 1384 | Other | Santa Rosa · Sonoma County | — | — |
| Armanino Painting | Armanino Painting | armaninopainting@gmail.com | (707) 537 5252 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Armbrust Tile Co | Werner George Armbrust | wernera@sonic.net | (707) 539 6121 | Other | Santa Rosa · Sonoma County | — | — |
| Armed Force Pest Control | Armed Force Pest Control | — | (707) 405-3899 | Pest, tile roofs | Middletown · Sonoma County | — | — |
| Armony Construction Co | Deanna Jocelyn Alexander | — | (707) 838 0030 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Armstrong Landscape Construction & Maintenance | Alfonso Efrain Rodriguez Mendoza | — | (707) 494 3085 | Windows, patio, painters | El Verano · Sonoma County | — | — |
| Arnold Construction Company | Timothy Edward Arnold | — | (707) 528 9328 | Other | Fulton · Sonoma County | — | — |
| Arntz Builders INC | Thomas Eugene Arntz | — | (707) 835 2900 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Arntz/focon Joint Venture | INC Focon | — | (707) 835 2900 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Arrow Construction And Remodeling | Raul Gerardo Robles | — | (415) 328 6553 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Arrow Glass | Arrow Glass | — | (707) 433 4860 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| Arrowtown Construction INC | Clayt Robert Bertlesman | — | (707) 934 7465 | Electricians | Sonoma · Sonoma County | — | — |
| Arroyo Hardscape INC | Everton De Oliveira Rocha | — | (707) 753 0775 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Ars Roofing And Gutters | Letitia Renee Hanke | — | (707) 584 5900 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Arteaga Builders INC | Robert Arteaga | — | (707) 765 6662 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Artefact Design & Salvage | Artefact Design & Salvage | — | (707) 933-0660 | Restoration | Sonoma · Sonoma County | — | — |
| Artemio Diaz | Artemio Diaz | — | (707) 477 7302 | HVAC | Guerneville · Sonoma County | — | — |
| Artisan Builders | Artisan Builders | — | (707) 495 9001 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Artisan Builders INC | Antonio De Jesus Lopez Reyna | — | (707) 239 0676 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Artisan Edge Construction | Robbie James Carreiro | — | (707) 373 0864 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Artisan Masonry | Artisan Masonry | — | (415) 509 5258 | Other | Petaluma · Sonoma County | — | — |
| Artisan Pacific Builders INC | Matthew Kent Watson | — | (707) 480 8734 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Artisan Stone Solutions INC DBA Artisan Tile | Jonathan Michael Straub | — | (707) 529 0716 | Other | Graton · Sonoma County | — | — |
| Artisan Timber Works LLC | Thomas Mueller Howes | bleclaire@artisantimberworks.com | (707) 230 1683 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Artisan Woodworks | Artisan Woodworks | — | (707) 318 9079 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Artisanov Construction INC | Hristiyan Yordanov Atanasov | — | (415) 531 2487 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Artistic Heritage Painting INC | Miguel Guzman | — | (707) 495 3357 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Artistree LLC | Jeffrey Wayne Buss | — | (512) 923 7822 | GC, remodel, ADU | Occidental · Sonoma County | — | — |
| Arvo Builders LLC | Ariston Jr Alves Do Nascimento | hello@arvobuilders.com | (415) 521 6084 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Asapp Pro Masonry | Asapp Pro Masonry | — | (707) 495 7666 | Other | Santa Rosa · Sonoma County | — | — |
| Ascent Electric | Rich Sky | — | (707) 720 7890 | Electricians | Sebastopol · Sonoma County | — | — |
| Ashell Cunningham | Ashell Cunningham | — | (707) 888 0420 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Asr Pro Painting | Juan Ramirez Alfredo San | — | (415) 966 5162 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Atelier Wellander INC | Ronald Wesley Wellander | — | (707) 480 2748 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Atienza Construction | Kenneth Sergio Atienza | — | (415) 497 1105 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Atkinson Builders INC | Nathan Daniel Atkinson | — | (707) 343 5992 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |