| Ajm General Construction | Adam Joseph Mclaughlin | — | (707) 324 7992 | Electricians | Santa Rosa · Sonoma County | — | — |
| Ak Tile | Ak Tile | — | (415) 858 2820 | Other | Rohnert Park · Sonoma County | — | — |
| Akita Landscape INC | Christopher Mark Zaim | — | (707) 486 2548 | Windows, patio, painters | Duncans Mills · Sonoma County | — | — |
| Al - Ro Plumbing | Al - Ro Plumbing | — | (415) 320 6115 | Other | Petaluma · Sonoma County | — | — |
| Al Imrie | Al Imrie | — | (707) 486 0829 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Al Sole Pool Service | Guerra Miguel | — | (415) 320 9509 | Pool | Rohnert Park · Sonoma County | — | — |
| Alan B Cohen Contractor | Alan B Cohen Contractor | — | (707) 431 7100 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Alan Lapierre | Alan Lapierre | — | (707) 782 3223 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Albatross Custom Construction | Justin Thomas Bunkley | — | (707) 843 2873 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Albaugh Heating And Air - Conditioning | David Lowell Albaugh | — | (707) 871 3530 | HVAC | Santa Rosa · Sonoma County | — | — |
| Albert Coppin-coppin Construction | Coppin Albert | — | (707) 528 1400 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Albini Grading And Excavating | Wesley Edward Albini | — | (707) 548 6671 | Other | Bodega · Sonoma County | — | — |
| Albright Plumbing | Albright Plumbing | — | (707) 695 6294 | Other | Santa Rosa · Sonoma County | — | — |
| Alcatraz General Building | Alcatraz General Building | — | (707) 889 7058 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Alcazar Bro's Concrete | Sanchez Jesus Alcazar | — | (707) 536 8720 | Other | Santa Rosa · Sonoma County | — | — |
| Alcazar Concrete | Alcazar Concrete | — | (707) 974 2028 | Other | Penngrove · Sonoma County | — | — |
| Alcazar Tile | Alcazar Tile | — | (707) 623 7948 | Other | Santa Rosa · Sonoma County | — | — |
| Alcazar Tree Service LLC | Juan Diego Torres Alcazar | — | (707) 907 1848 | Tree | Santa Rosa · Sonoma County | — | — |
| Alderman & Son Plumbing | Alderman & Son Plumbing | — | (707) 694 2020 | Other | Santa Rosa · Sonoma County | — | — |
| Aldridge Master Builders | Christopher Steven Aldridge | — | (408) 234 3650 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Alebrijes Painting Co | Aguirre Mauricio | — | (707) 364 9298 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Aleman Concrete Construction | Doug Anthony Aleman | — | (760) 835 0566 | Other | Santa Rosa · Sonoma County | — | — |
| Alert Technology | Alert Technology | — | (707) 996-9059 | Alarm and generators | Sonoma · Sonoma County | — | — |
| Alex And Alex Painting INC | Vega Alejandro Bravo | — | (707) 703 6097 | Windows, patio, painters | Guerneville · Sonoma County | — | — |
| Alex Flooring Covering | Alex Flooring Covering | — | (707) 547 7104 | Other | Santa Rosa · Sonoma County | — | — |
| Alex Painting Pro INC | Chavez Alejandro Trejo | — | (707) 321 7716 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Alex Reaney | Alex Reaney | — | (707) 696 3911 | Electricians | Santa Rosa · Sonoma County | — | — |
| Alex Taylor Construction | Alexander Randolph Taylor | — | (707) 338 2889 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Alexander Custom Tile & Stone | Alexander Custom Tile & Stone | — | (707) 529 4567 | Other | Rohnert Park · Sonoma County | — | — |
| Alexander Floor Coatings INC | William Robert Alexander | — | (707) 888 5156 | Windows, patio, painters | Cotati · Sonoma County | — | — |
| Alexander T Crump Painting | Alexander T Crump Painting | — | (707) 328 2365 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Alexander Valley Contractings | Alexander Valley Contractings | — | (707) 799 6451 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Alfredo Flores DBA Medina Electric | Alfredo Medina Flores | — | (707) 696 0509 | Electricians | Petaluma · Sonoma County | — | — |
| Alfredo Vasquez | Alfredo Vasquez | — | (707) 838 0942 | Other | Windsor · Sonoma County | — | — |
| Alfredo's Painting Pro LLC | Manuel Alfredo Contreras Sayago | — | (707) 836 3836 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Alkimia Landscaping LLC | Erick Salvio Santiago Soriano | — | (707) 774 9552 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| All - Star Alarm | All - Star Alarm | interested@domainmarket.com | (707) 528 4004 | Electricians | Santa Rosa · Sonoma County | — | — |
| All About Additions Construction | George William Iii Thibault | — | (707) 486 2340 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| All About Ashes | All About Ashes | — | (707) 396 7867 | Other | Rohnert Park · Sonoma County | — | — |
| All About Fire Protection | All About Fire Protection | — | (707) 235 0627 | Other | Sebastopol · Sonoma County | — | — |