| Wch Property Services | Douglas Leroy Jr Newcomb | — | (707) 800 2851 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| We Care Pest Solutions | We Care Pest Solutions | — | (707) 988-5780 | Pest, tile roofs | Santa Rosa · Sonoma County | — | — |
| Weatherly Water Heaters And Plumbing Services | Douglas Aaron Weatherly | — | (707) 495 2740 | Other | Windsor · Sonoma County | — | — |
| Weaver's Independent Services & Construction | Bruce Edward Weaver | — | (707) 578 3822 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Web Electrical Contracting Incorporated | Dustin Corey Eaton | — | (707) 546 5434 | Electricians | Cloverdale · Sonoma County | — | — |
| Wedge Roofing INC | Gary Patrick Harvey | info@wedgeroofing.com | (707) 763 5475 | Other roofers | Petaluma · Sonoma County | — | — |
| Weeks Drilling And Pump Co | Brandon James Burgess | — | (707) 823 3184 | Other | Sebastopol · Sonoma County | — | — |
| Wellander Corporation | Ryan Wesley Wellander | — | (707) 934 8198 | Other | Sonoma · Sonoma County | — | — |
| Wells And Company Builders INC | Garth David Wells | — | (415) 300 6848 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Wells General Construction | Nicolas Daniel Wells | — | (707) 481 0970 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Wendt Electric INC | Gabriel Thomas Wendt | — | (707) 953 2582 | Electricians | Sebastopol · Sonoma County | — | — |
| Werner Nase Jr | Werner Nase Jr | — | (707) 321 5013 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Wesco Contracting INC | Daniel John Hannan | — | (707) 708 1010 | GC, remodel, ADU | Fulton · Sonoma County | — | — |
| Wesco Contracting Services INC | David Wesley Wolff | — | (707) 975 1020 | GC, remodel, ADU | Camp Meeker · Sonoma County | — | — |
| West Bay Garden Co | Jesus Manuel Garcia | — | (707) 758 5131 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| West Bear Landscapes LLC | Sebastian Martinez | — | (727) 542 6196 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| West Coast Acoustical INC | Brandon James Crayne | — | (707) 775 9383 | Other | Cotati · Sonoma County | — | — |
| West Coast Construction | Gary Patrick Stanley | — | (707) 480 6027 | Other | Petaluma · Sonoma County | — | — |
| West Coast Electric Service Company INC | Philip Mark Pitcavage | — | (707) 978 2609 | Electricians | Santa Rosa · Sonoma County | — | — |
| West Coast Fiberglass Pools | Jeffery Alan Cerini | jeffmail3006@yahoo.com | (707) 349 2880 | Pool | Santa Rosa · Sonoma County | — | — |
| West Coast Landscaping | West Coast Landscaping | — | (415) 819 5684 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| West Coast Painting & Coatings | David Michael Mc Veigh | — | (707) 763 1231 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| West Coast Plumbing | West Coast Plumbing | interested@domainmarket.com | (707) 239 4637 | Other | Santa Rosa · Sonoma County | — | — |
| West Coast Plumbing | Chase Ryan Roth | interested@domainmarket.com | (707) 750 9900 | Other | Santa Rosa · Sonoma County | — | — |
| West Coast Professional Door INC | William Richard Schmidt | — | (707) 894 2183 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| West Coast Reinforcing INC | George Ray Marinkovich | — | (707) 479-9019 | Other | Healdsburg · Sonoma County | — | — |
| West Coast Roofing Services INC | Chavez Israel Levya | — | (707) 208 5870 | Other roofers | Santa Rosa · Sonoma County | — | — |
| West Coast Tile & Stone | West Coast Tile & Stone | — | (707) 291 4585 | Other | Rohnert Park · Sonoma County | — | — |
| West Coast Tree Service | Edward Manuel Rivas | — | (707) 228 3904 | Tree | Monte Rio · Sonoma County | — | — |
| West Coast Wild Ecological Restoration LLC | Jonathan Blake Backus | — | (707) 529 5257 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| West County Enterprises | Susan Mae Lablue | — | (707) 321 1832 | Other | Sebastopol · Sonoma County | — | — |
| West County Refrigeration | West County Refrigeration | — | (707) 322 0967 | HVAC | Forestville · Sonoma County | — | — |
| West County Septic LLC | Allan James West | westcountyseptic@gmail.com | (707) 823 7340 | Other | Sebastopol · Sonoma County | — | — |
| West County Tile | Mark Stepfen Reischenbock | — | (707) 326 4703 | Other | Santa Rosa · Sonoma County | — | — |
| West Electric And Lighting | Mark John Westphal | — | (415) 310 3547 | Electricians | Petaluma · Sonoma County | — | — |
| West Elevation Contracting | Jason Adam Bode | — | (707) 239 4055 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| West Light Electric | Nathan Michael Pulis | — | (707) 486 4396 | Electricians | Sebastopol · Sonoma County | — | — |
| West Side Grading & Paving | Gary Patrick Stanley | — | (925) 325 9370 | Other | Petaluma · Sonoma County | — | — |
| West Wide Electric INC | Richard Laurence Creekmore | — | (707) 332 4080 | Electricians | Santa Rosa · Sonoma County | — | — |
| Westar Restoration | Westar Restoration | info@westarrestoration.com | (415) 413 0066 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |