| Wingett Construction | Steven Grant Wingett | — | (707) 396 2708 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Winglewich Landscape Contracting | Samuel Bannan Winglewich | — | (707) 755 0612 | Windows, patio, painters | Occidental · Sonoma County | — | — |
| Winkler Aquascapes | Winkler Aquascapes | — | (707) 291 5001 | Other | Windsor · Sonoma County | — | — |
| Winters Construction Company | Marc Robert Winters | — | (707) 483 5599 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wired & Ready Home Automation INC | Michael William Johnson | — | (707) 495 9313 | Other | Windsor · Sonoma County | — | — |
| Wirewolf INC | Robert Colby Larson | — | (650) 201 5884 | Electricians | Guerneville · Sonoma County | — | — |
| Wise Construction | Dustin Allen Wise | — | (415) 827 2881 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Wittens Chimney Service INC | Jeffrey Brian Witten | wittenschimneysrvc@gmail.com | (415) 331-8541 | Other | Rohnert Park · Sonoma County | — | — |
| Wizard Construction | Nathan Herschel Apple | — | (415) 850 0259 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Woebcke Painting | Woebcke Painting | — | (707) 721 6646 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Wolf Electric INC | Wolf Christoph Von Reitzenstein | — | (707) 255 8574 | Electricians | Sonoma · Sonoma County | — | — |
| Wolf HVAC INC | Robert Steven Wolf | robertwolf@wolf-hvac.com | (707) 364 3342 | HVAC | Cotati · Sonoma County | — | — |
| Wolfe Communications | Wolfe Communications | — | (707) 387 1140 | Other | Santa Rosa · Sonoma County | — | — |
| Wolff Contracting INC | Michael Robert Wolff | — | (707) 799 4910 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wolff's Welding & Fabrication INC | Michael Brian Lewis | — | (707) 933 8590 | Other | Sonoma · Sonoma County | — | — |
| Wollmer Custom Building | Jeffrey Ronald Wollmer | — | (707) 571 8885 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wood Acre Electrical Industries | Danya Mazur Parkinson | — | (415) 279 5483 | Electricians | Graton · Sonoma County | — | — |
| Wood Construction | Sanford James Wood | — | (707) 703 2166 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wood Designs By Michael Furniture And Cabinets | Michael James Ruiz | — | (707) 287 0930 | Other | Santa Rosa · Sonoma County | — | — |
| Wood Touch INC | Robert James Castillo | — | (707) 938 8336 | Other | Sonoma · Sonoma County | — | — |
| Woodfield Properties | Woodfield Properties | — | (707) 996-3060 | Property managers | Sonoma · Sonoma County | — | — |
| Woodforms INC | Kendall Louise Holmes | — | (707) 585 1265 | Other | Santa Rosa · Sonoma County | — | — |
| Woodland's Landscaping | Woodland's Landscaping | — | (369) 202 9316 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Woodrow Marie Fleming | Woodrow Marie Fleming | — | (707) 337 4830 | Other | Penngrove · Sonoma County | — | — |
| Woodworking West INC | Brian William Lanigan | — | (415) 699 7581 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Woosley Concrete | Woosley Concrete | — | (707) 529 7348 | Other | Santa Rosa · Sonoma County | — | — |
| Worby Electric | Zachary Paul Worby | — | (707) 870 9016 | Electricians | Sebastopol · Sonoma County | — | — |
| Worden Enterprises INC | Vickie Ann Worden | — | (707) 538 1206 | Other | Santa Rosa · Sonoma County | — | — |
| Wordinger Construction | Brian Gary Wordinger | — | (707) 502 6657 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Worthington Construction | Phineas Randolph Worthington | office@worthingtoncontracting.com | (707) 310 6521 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Wr Construction Services | William Richard Wallett | — | (707) 395 5654 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Wr Williams Co INC DBA Certapro Painters Of Sonoma County | Robert Raymond Koch | bwilliams@certapro.com | (707) 596 5064 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Wright & Sons Construction | Lance Eric Wright | — | (707) 217 6162 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wright Bryan James | Wright Bryan James | — | (707) 481 6574 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wright Builders Ca | Philip Anthony Jr Wright | — | (707) 536 9525 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Wright Building And Design | Wright Building And Design | info@wrightbuildingdesign.co.uk | (707) 823 2817 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Wright Contracting General Builders | Stephen Michael Wright | — | (707) 528 1172 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wright Contracting INC | Michael James Wright | — | (707) 528 1172 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wright Residential Construction L L C | Matthew Thomas Van Heusen | — | (707) 978 5851 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wright Rhode Construction | Dean Edward Rhode | — | (707) 484 2105 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |