| Shane Mckee | Shane Mckee | — | (707) 326 5987 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Shane Symons Roofing | Shane Anthony Symons | — | (707) 235 9911 | Other roofers | Petaluma · Sonoma County | — | — |
| Shannon Derutte Construction | Shannon Peter De Rutte | — | (707) 849 8255 | GC, remodel, ADU | Fulton · Sonoma County | — | — |
| Shannon Masonry Construction INC | Timothy Frank Shannon | — | (707) 544 6266 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Shaphan Walker INC | Shaphan Lee Walker | — | (707) 304 0051 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Shaughnessy Development | Shaughnessy Development | — | (707) 696 9611 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Shaun Burr | Shaun Burr | — | (415) 717 7192 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Shawn B Johnson Heating And Cooling | Shawn Bryan Johnson | — | (707) 529 1053 | HVAC | Windsor · Sonoma County | — | — |
| Shawn P Bettega Construction INC | Shawn Patterson Bettega | — | (707) 884 4713 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Shawn's Paving Services | Shawn Wayne Stanley | — | (707) 596 0859 | Other | Santa Rosa · Sonoma County | — | — |
| Sheehan Construction INC | Thomas Francis Sheehan | — | (707) 603 2610 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Sheeran Builders INC | Ryan Canice Sheeran | — | (707) 889 2035 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Shelter Roofing | Steven Donald Roark | — | (707) 664 8918 | Other roofers | Rohnert Park · Sonoma County | — | — |
| Shelter Services INC DBA Jackrabbit Landscapes | Stephan Roland Schlenker | — | (415) 624 9385 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Shelton Electric | Daniel Ryan Shelton | info@sheltonelectric.com | (707) 695 9564 | Electricians | Rohnert Park · Sonoma County | — | — |
| Shepherd Services INC | Bruce James Kirk | — | (707) 484 4863 | HVAC | Santa Rosa · Sonoma County | — | — |
| Sheppard Contracting | Adam Dean Sheppard | — | (707) 478 2302 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Shergill Contractor | Amarjit Singh | — | (707) 870 5212 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Shook & Waller Construction INC | Ed Dean Waller | — | (707) 578 3933 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Short Steel Construction | Michael Lloyd Short | — | (707) 293 0052 | Other | Santa Rosa · Sonoma County | — | — |
| Showalter Construction | Scott Robert Showalter | — | (707) 486 5847 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Shri Hari Development INC | Mahendra Vallabhbhai Gajipara | — | (408) 469 8918 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Sierra Coast Builders INC | Joseph Edward Jr Hand | info@sierracoastbuilders.com | (707) 696 6546 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Sierra Gold Landscaping | Sierra Gold Landscaping | sierragold19@gmail.com | (707) 328 3091 | Windows, patio, painters | Geyserville · Sonoma County | — | — |
| Sierra Pipeline INC | Kimberly Ann Every Knechtle | — | (707) 527 5465 | Other | Santa Rosa · Sonoma County | — | — |
| Sierra Remodeling & Construction | Thomas Michael Harrigan | — | (415) 483 6462 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Sierra Tree Company INC | Gonzalez Barahona Arnoldo | — | (707) 495 0597 | Tree | Rohnert Park · Sonoma County | — | — |
| Sierra West Construction | Steven Paul Lenschmidt | ed.sierrawest@gmail.com | (415) 990 3657 | Other | Sebastopol · Sonoma County | — | — |
| Sierra's Concrete | Sierra's Concrete | — | (707) 396 3809 | Other | Santa Rosa · Sonoma County | — | — |
| Siers Construction | James Robert Jr Siers | — | (408) 569 9882 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Sigal Utility Services INC | Vincent Pearce Sigal | — | (707) 486 1822 | Electricians | Windsor · Sonoma County | — | — |
| Sightline Builders INC | Sarah Ann Brown | — | (707) 849 4203 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Signal Path Technology Solutions LLC | Michael William Johnson | — | (707) 495 9313 | Other | Windsor · Sonoma County | — | — |
| Signall Systems | Signall Systems | — | (707) 843 1300 | Other | Santa Rosa · Sonoma County | — | — |
| Signature Builders INC | Anthony Davis Merciari | — | (707) 477 6174 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Signature Floorcoverings | Signature Floorcoverings | — | (707) 837 3456 | Other | Sonoma · Sonoma County | — | — |
| Signor Construction | Thomas Edward Durgin | — | (707) 782 6285 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Signs Of All Kinds INC | Charles Boyd Drayer | — | (707) 623 5322 | Other | Santa Rosa · Sonoma County | — | — |
| Signs Par Excellence INC | Michael Ashley Flanagan | — | (707) 579 8982 | Other | Santa Rosa · Sonoma County | — | — |
| Sikes Asphalt Group INC | Jacob Jon Sikes | — | (707) 578 1414 | Other | Santa Rosa · Sonoma County | — | — |