| Sal Gen Con INC | Seth Adam Lyle | — | (707) 526 5549 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Salazar General Construction | Salazar Gerardo | — | (707) 692 6021 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Salcedo's Earthwork And Paving | Salcedo's Earthwork And Paving | — | (707) 393 9603 | Other | Santa Rosa · Sonoma County | — | — |
| Salmuri LLC | Jesse Abraham Martinez | — | (707) 972 7483 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Sals Superior Concrete LLC | Rodriguez Salvador Sanchez | — | (707) 322 5303 | Other | Santa Rosa · Sonoma County | — | — |
| Salt Shed Design Build LLC | Michael Edward Coleman | — | (707) 559 2089 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Salty Builder | Salty Builder | russhendrick@saltybuilder.com | (530) 721 5999 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Sam's Landscaping | Sam's Landscaping | — | (707) 228 2015 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Sam's Tree Service | Samuel Ayala Garcia | — | (707) 293 6930 | Tree | Santa Rosa · Sonoma County | — | — |
| Same Day Heating Cooling & Plumbing | Curtis James Moore | — | (707) 440 0590 | HVAC | Windsor · Sonoma County | — | — |
| Same Day Plumbing And Water Cleanup | Elisha Mayost | — | (415) 696 0700 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Samuel Gerhard | Samuel Gerhard | — | (707) 953 8771 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| San Carlos Concrete INC | Ortiz Carlos Ortiz | sancconcreteinc@gmail.com | (707) 971-9475 | Other | Rohnert Park · Sonoma County | — | — |
| San Francisco Audioworks | San Francisco Audioworks | — | (415) 559 1316 | Other | Sebastopol · Sonoma County | — | — |
| San Rafael Tile & Marble | San Rafael Tile & Marble | — | (415) 497 6352 | Other | Santa Rosa · Sonoma County | — | — |
| Sanctuary North INC | Andrew Cooper Esslinger | cooper@sanctuary-north.com | (707) 331 2816 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Sandborn Tree Service INC | Ralph Eric Sandborn | service@sandborntree.com | (707) 823 9144 | Tree | Sebastopol · Sonoma County | — | — |
| Sandeen Plumbing LLC | Richard Eric Sandeen | eben@eyebytes.com | (707) 938 7274 | Other | Sonoma · Sonoma County | — | — |
| Sandkings Drywall | Sandkings Drywall | — | (707) 326 9196 | Other | Santa Rosa · Sonoma County | — | — |
| Sandoval Landscaping | Sandoval Landscaping | — | (707) 595 8081 | Windows, patio, painters | Cotati · Sonoma County | — | — |
| Sanguinetti Painting Company | Michael Woford Sanguinetti | — | (415) 342 8474 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Sanitary Solutions Corp | Jorge Alberto Jr Valencia Ceja | — | (707) 791 5885 | Other | Santa Rosa · Sonoma County | — | — |
| Santa Cruz Pool Construction And Service | Scott Conway Stratford | — | (480) 640 0006 | Pool | Santa Rosa · Sonoma County | — | — |
| Santa Rosa Glass | Santa Rosa Glass | — | (707) 282 5700 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Santa Rosa Heating And Air Conditioning | Todd Robert Fry | — | (707) 494 1877 | HVAC | Santa Rosa · Sonoma County | — | — |
| Santa Rosa Landscape | Santa Rosa Landscape | — | (707) 695 2021 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Santa Rosa Plumbing LLC | Brown Steve | — | (707) 528 8228 | Other | Cotati · Sonoma County | — | — |
| Santa Rosa Pool Service INC | Rodney Reid Fernandez | — | (707) 538 3838 | Pool | Santa Rosa · Sonoma County | — | — |
| Santa Rosa Stainless Steel Tank Company LLC | Nathan Bryon Williams | — | (707) 328 2088 | Other | Windsor · Sonoma County | — | — |
| Santana Concrete | Santana Concrete | — | (707) 703 0488 | Other | Santa Rosa · Sonoma County | — | — |
| Santiago General Engineering | Santiago General Engineering | — | (707) 490 8177 | Other | Sebastopol · Sonoma County | — | — |
| Santiago's Landscaping LLC | Santiago Chavez Jesus | — | (707) 328 9945 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Santiago's Painting | Santiago's Painting | — | (707) 774 3106 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Sao Miguel Paint | Jerry Jorge Ponte | — | (707) 217 8039 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Sarah Johnson Restoration And Conservation Services | Sarah Johnson Restoration And Conservation Services | — | (415) 317-2490 | Restoration | Petaluma · Sonoma County | — | — |
| Sasway Construction | Benjamin Harlan Sasway | — | (707) 338 7625 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Satori Construction | Stephen Joseph Rebentisch | info@satori-construction.com | (415) 996 6654 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Sauls Acoustical | Sauls Acoustical | — | (707) 799 2983 | Other | Santa Rosa · Sonoma County | — | — |
| Sausal Creek Landscaping LLC | Brian Sebastian Saini | — | (707) 799 9615 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| Save Energy Co | Patricia Marie Gorman | — | (707) 347 1900 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |