| All About Homes | All About Homes | — | (707) 479 6312 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| All Access Bobcat | All Access Bobcat | rubicon71@comcast.net | (707) 792 7765 | Other | Cotati · Sonoma County | — | — |
| All Access Concrete And Construction | Garcia-lopez Roy | — | (707) 304 0033 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| All Around Gutters | All Around Gutters | interested@domainmarket.com | (707) 823 0379 | Other | Sebastopol · Sonoma County | — | — |
| All Bay Drilling INC | Ralph William Iii Powers | — | (707) 762 1199 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| All Bay Sewer INC | Michael Phillip Magatelli | — | (415) 702 8626 | Other | Santa Rosa · Sonoma County | — | — |
| All County Abatement | Jonathan Aaron Sanchez | — | (707) 200 8011 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| All County Paving | Jim Anthony Jr Todorovitch | — | (707) 236 5352 | Other | Santa Rosa · Sonoma County | — | — |
| All Covered Electric | Christopher William Blount-Hagstrom | — | (707) 339 0691 | Electricians | Rohnert Park · Sonoma County | — | — |
| All Electric | Tripolt Thomas | — | (415) 336 7968 | Electricians | Petaluma · Sonoma County | — | — |
| All Fired Up | All Fired Up | — | (707) 823 5920 | Other | Santa Rosa · Sonoma County | — | — |
| All Grade Excavating INC | Asa Lee Heintz | — | (707) 478 4546 | Other | Santa Rosa · Sonoma County | — | — |
| All Hands Restoration INC | John Thomas Jr Fruehe | info@allhandsrestoration.com | (707) 737-4211 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| All Phase Concrete | Frank Gregory Coleman | allphaseconcrete@gmail.com | (707) 544 4707 | Other | Santa Rosa · Sonoma County | — | — |
| All Property Construction INC | Sean Joseph Drake | — | (707) 861 1064 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| All Screens | Richard Dale Withington | — | (707) 525 1474 | Other | Santa Rosa · Sonoma County | — | — |
| All Signs Lettering | All Signs Lettering | — | (707) 528 2770 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| All Star Electric Services Incorporated | Brian Jeffrey Bogges | — | (707) 953 4672 | Electricians | Kenwood · Sonoma County | — | — |
| All Terrane Excavating INC | Donald Rudolph Clay | — | (707) 477 2337 | Other | Santa Rosa · Sonoma County | — | — |
| All The Above Craftsmen | Aaron Matthew Tayl| Riechel Aaron Taylor Matth Riechel | — | (310) 628 6308 | Electricians | Cotati · Sonoma County | — | — |
| All The Way Construction | William Clift Mcginnis | allwaysconstruction123@gmail.com | (512) 415 1740 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| All Tree Service INC | Jorge Martin Godinez Soltero | — | (707) 843 2333 | Tree | Santa Rosa · Sonoma County | — | — |
| All Ways Painting Plus | All Ways Painting Plus | — | (707) 623 0552 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| All Window & Door | All Window & Door | — | (415) 948 4522 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| All-wayz Construction N Paint LLC | Anthony Thomas Hathaway | — | (818) 665 8480 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Allan Cobb | Allan Cobb | — | (707) 322 0344 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Allen Henderson | Allen Henderson | — | (707) 292 7592 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Allen Landscaping INC | Jeffery Bruce Allen | — | (707) 526 3177 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Allen Landscaping Jeffery B Allen | Allen Landscaping Jeffery B Allen | — | (707) 526 3177 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Allen Mechanical | Allen Mechanical | — | (707) 703 2600 | Other | Santa Rosa · Sonoma County | — | — |
| Allen Winters Concrete LLC | Allen George Winters | — | (707) 823 8085 | Other | Sebastopol · Sonoma County | — | — |
| Alliance Cooling Products And Construction INC | John Ray Smith | — | (707) 431 8191 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Allied Restoration Company INC | Michael Wayne Tabayoyon | — | (415) 413 0066 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Allphase Paving | Allphase Paving | — | (707) 333 7540 | Other | Petaluma · Sonoma County | — | — |
| Allstar Construction LLC | Esparza Armando | — | (707) 322 1405 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Alltrade Building | Alltrade Building | — | (415) 680 4235 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Allwest Construction | Steven James Hardister | — | (707) 732 6011 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Almeraz Concrete INC | Stacey Christina Almeraz | — | (707) 708 2788 | Other | Santa Rosa · Sonoma County | — | — |
| Aloha Electric INC | George Poi Tsin Ah Chin | — | (707) 291 6823 | Electricians | Santa Rosa · Sonoma County | — | — |
| Alpd INC | Jose Antonio Lomeli | — | (415) 272 1317 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |