| Amp Champ Electric | Matthew Eric Kruse | — | (707) 696 5703 | Electricians | Cloverdale · Sonoma County | — | — |
| Amp-a-neer | Jestin Trevor Walter | — | (707) 799 5751 | Electricians | Santa Rosa · Sonoma County | — | — |
| An Artistic I | An Artistic I | — | (707) 799 7840 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| An Fence Company | Alexander Angelo Nogara | — | (707) 494 3280 | Other | Sonoma · Sonoma County | — | — |
| Anaclerio Construction | Mark Steven Anaclerio | — | (707) 953 4405 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Analy Septic | Analy Septic | — | (707) 823 7340 | Other | Sebastopol · Sonoma County | — | — |
| Anchor Electric | Roger Hall Horick | — | (707) 484 0329 | Electricians | Petaluma · Sonoma County | — | — |
| Anchordoguy Landscaping | Michael Earl Squire | — | (707) 546 8500 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Ancrfng INC | Brian Andrew Alton | info@ancroofing.net | (707) 576 1875 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Anderholm Electric | Jason Grant Anderholm | — | (707) 806-4860 | Electricians | Rohnert Park · Sonoma County | — | — |
| Andersen Excavating INC | Clay Michael Andersen | — | (707) 889 2714 | Other | Cloverdale · Sonoma County | — | — |
| Anderson And Sons Construction | Michael Gregg Anderson | — | (707) 292 9383 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Anderson Flooring | Anderson Flooring | — | (707) 291 9086 | Other | Windsor · Sonoma County | — | — |
| Anderson Home Repair INC | Brian Grant Anderson | — | (707) 338 1484 | GC, remodel, ADU | Vineburg · Sonoma County | — | — |
| Anderson's Landscape | Anderson's Landscape | — | (707) 548 2256 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Anderson's Quality Woodwork | Anderson's Quality Woodwork | serge@andersonsqualitywoodwork.com | (707) 291 7452 | Other | Rohnert Park · Sonoma County | — | — |
| Anderson's Tree Service | Johnpaul Riley Anderson | — | (707) 996 5098 | Tree | Kenwood · Sonoma County | — | — |
| Andrade Construction Company | Steven Edward Andrade | — | (707) 541 0859 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Andres Chavez | Andres Chavez | — | (707) 328 8670 | Other | Sonoma · Sonoma County | — | — |
| Andriuska Viktoras | Andriuska Viktoras | — | (708) 369 9099 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Andy Dean Electric / Security INC | Andrew Jon Dean | — | (707) 542 4208 | Electricians | Santa Rosa · Sonoma County | — | — |
| Angard Electric | Jonathan Paul Dragna | — | (707) 321 8378 | Electricians | Santa Rosa · Sonoma County | — | — |
| Angel Brother's Lath And Plastering INC | Jose Ivan Angel Castro | — | (707) 569 6386 | Other | Windsor · Sonoma County | — | — |
| Angel Landscaping | Angel Landscaping | interested@domainmarket.com | (707) 331 6530 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Angel's Construction | Ramirez-delia Angel | — | (707) 774 2872 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Angeli Bertlow Construction Incorporated | Jason Clay Bertlow | — | (707) 933 3808 | GC, remodel, ADU | El Verano · Sonoma County | — | — |
| Anguiano Custom Painting | Anguiano Custom Painting | — | (707) 775 0535 | Windows, patio, painters | Cotati · Sonoma County | — | — |
| Annadel Builders INC | Richard Wallace Kirby | — | (707) 579 6282 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Anova Property Management | Anova Property Management | — | (707) 528 8300 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Anthony B Amos Shower Door & Mirror | Anthony Brian Amos | — | (520) 909 7362 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Anthony Bertotti Landscaping INC | Anthony Ray Bertotti | — | (707) 559 7077 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Anthony Eugene Canevari | Anthony Eugene Canevari | — | (707) 576 9922 | Other | Santa Rosa · Sonoma County | — | — |
| Anthony Joseph Adiego | Anthony Joseph Adiego | — | (707) 975 4083 | HVAC | Petaluma · Sonoma County | — | — |
| Anthony Sage | Anthony Sage | tony@anthonysage.com | (707) 704 7270 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Anthony's Painting | Anthony's Painting | anthony@anthonyspainting.com | (707) 308 5590 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Antillan Concrete | Antillan Concrete | — | (707) 527 9139 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Antonini Construction | Robert F Antonini | — | (415) 812 0307 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Antonio's Construction Company | Marco Antonio Hernandez Ortega | pimentelantonio67@gmail.com | (401) 228-4333 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Antonis Construction Building & Painting INC | Chris Theodore Antonis | — | (707) 280 5740 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Anytime Painting | Anytime Painting | — | (707) 360 8844 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |