| Sola Construction | Troy Daniel Sola | — | (707) 732 3666 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Sola De Vega Landscaping | Sola De Vega Landscaping | — | (707) 799 9746 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Solano Construction INC | Gonzalez Luis Solano | — | (707) 228 7844 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Solaris Construction INC | Brent Allan Svendsen | — | (707) 501 9454 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Solas Electric | Paul Stephen White | info@solaselectric.com | (707) 590 0924 | Electricians | Sonoma · Sonoma County | — | — |
| Solcat Construction | Matthew Mac Crea Dickey | — | (707) 337 6339 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Solid Point Construction & Consulting INC | Jacob Owen Miller | — | (707) 608 4857 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Solidarity Electric | Hebert Alexander Moran Sandoval | — | (415) 466 5952 | Electricians | Santa Rosa · Sonoma County | — | — |
| Solidarity Painting INC | Greg Steven Kuzmicki | — | (707) 544 9551 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Solis Construction Company INC | Eric Sean Solis | — | (707) 333 9413 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Solutions Plan LLC DBA Rhyne Design Custom Cabinets | Arthur Frankle Kopecky | — | (707) 829 1226 | Other | Sebastopol · Sonoma County | — | — |
| Something New Construction | Jose Luis Velez | — | (707) 338 3091 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Somo Construction INC | Jeffrey Robert Vincenzini | — | (707) 795 3550 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Sono-Marin Pest | Sono-Marin Pest | info@sonomarinpest.com | (707) 604-8188 | Pest, tile roofs | Santa Rosa · Sonoma County | — | — |
| Sonoma - Marin Arborists INC | Zachary Arian Wilder | — | (707) 762 8733 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Sonoma Backyard | Thomas Wayne Tavenner | — | (707) 795-0772 | Pool | Cotati · Sonoma County | — | — |
| Sonoma Backyard Pool Construction | Sonoma Backyard Pool Construction | — | (707) 795-0772 | Pool | Cotati · Sonoma County | — | — |
| Sonoma Build Group INC | Thomas Henry Mcclellan | — | (707) 543 1946 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Sonoma Builders INC | Cody Vonn Heimann | — | (704) 201-4294 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Sonoma Cast Stone Corporation | Stephen Lewis Rosenblatt | care@sonomastone.com | (707) 981 5029 | Other | Petaluma · Sonoma County | — | — |
| Sonoma Clean Power | Sonoma Clean Power | info@sonomacleanpower.org | (855) 202-2139 | EV chargers | Sonoma · Sonoma County | — | — |
| Sonoma Coast Builders INC | Martin Louis Espinosa | impallari@gmail.com | (707) 908 4014 | GC, remodel, ADU | Monte Rio · Sonoma County | — | — |
| Sonoma Coast Construction | Timothy Allen Carrington | sonomacoastconstruction@gmail.com | (707) 849 7350 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Sonoma Coast Electric INC | Robert John Machado | — | (707) 292-3233 | Electricians | Sebastopol · Sonoma County | — | — |
| Sonoma Coast Tile | Sonoma Coast Tile | neil@neilcooper.com | (707) 495 4726 | Other | Rohnert Park · Sonoma County | — | — |
| Sonoma County Comfort Heating & Air INC | Branden Tyler Garrison | — | (707) 888 2745 | HVAC | Santa Rosa · Sonoma County | — | — |
| Sonoma County Construction INC | Maria G Rodriguez | — | (707) 888 8063 | Other roofers | Rohnert Park · Sonoma County | — | — |
| Sonoma County Electric LLC | Lauren Diane Crosby | sonomacountyelectric@gmail.com | (707) 415 9000 | Electricians | Santa Rosa · Sonoma County | — | — |
| Sonoma County Excavating INC | Justin Strohm Thomasson | — | (707) 696 8706 | Other | Sebastopol · Sonoma County | — | — |
| Sonoma County Hardwood Floors | Sonoma County Hardwood Floors | — | (707) 332 1462 | Other | Santa Rosa · Sonoma County | — | — |
| Sonoma County Heating And Air LLC | Kenta Alex Gilmore | — | (707) 721 6292 | HVAC | Sonoma · Sonoma County | — | — |
| Sonoma County Pest Control | Sonoma County Pest Control | — | (707) 578-9913 | Pest, tile roofs | Sonoma · Sonoma County | — | — |
| Sonoma County Plumbing INC | David Joseph Zmrzel | — | (707) 838 7775 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Sonoma County Properties | Sonoma County Properties | — | (707) 823-2533 | Property managers | Graton · Sonoma County | — | — |
| Sonoma County Property Rentals | Sonoma County Property Rentals | info@sonomacountyconstruction.com | (707) 596-1020 | Property managers | Rohnert Park · Sonoma County | — | — |
| Sonoma County Pump | Orville Allen Lowe | info@sonomacountypump.com | (707) 483 8080 | Other | Sebastopol · Sonoma County | — | — |
| Sonoma County Roofing INC | Jesse Ryan Adams | — | (707) 583 1823 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Sonoma County Shade Company | Noah Simon Lenox | — | (707) 596 3011 | Other | Santa Rosa · Sonoma County | — | — |
| Sonoma County Sunrooms | David Christopher Hopkins | — | (707) 586 2710 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Sonoma County Tree Experts INC | Dennis William Jr Stansfield | — | (707) 769 8733 | Tree | Petaluma · Sonoma County | — | — |