| Roof Doctor Roofing & Construction | Roof Doctor Roofing & Construction | — | (209) 928-3968 | Other roofers | Tuolumne · Tuolumne County | — | — |
| Roofxperts | Matthew David Stone | — | (209) 770 7807 | Other roofers | Standard · Tuolumne County | — | — |
| Royce Construction | Evan Carter Royce | — | (209) 559 1502 | GC, remodel, ADU | Tuolumne · Tuolumne County | — | — |
| Royce Davis Custom Painting INC | Royce E Davis | rollsroycedavis@gmail.com | (209) 728 5947 | Windows, patio, painters | Tuolumne · Tuolumne County | — | — |
| Russ' Custom Tile Service | Russel Owen Davis | — | (650) 766 5765 | Other | Sugar Pine · Tuolumne County | — | — |
| Russell Donald Crook | Russell Donald Crook | — | (209) 768 2764 | Tree | Groveland · Tuolumne County | — | — |
| Russell G Hamilton | Russell G Hamilton | — | (310) 710 9696 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| S & R Painting | S & R Painting | — | (209) 928 5608 | Windows, patio, painters | Tuolumne · Tuolumne County | — | — |
| S B Landscaping | S B Landscaping | service@sblandscaping.com | (209) 872 1259 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| S J N Construction | Steven James Nelson | — | (209) 770 3160 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| S&d Utility Co LLC | Darryl Jonathan Tinkle | — | (209) 770 4019 | Electricians | Sonora · Tuolumne County | — | — |
| Sam Millard Painting | Sam Millard Painting | — | (209) 454 7920 | Windows, patio, painters | Jamestown · Tuolumne County | — | — |
| Sam Winkler | Sam Winkler | — | (209) 962 4846 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Samuel Adams Painting INC | Samuel Davan Adams | — | (209) 694 0217 | Windows, patio, painters | Soulsbyville · Tuolumne County | — | — |
| Sanchez Construction | Sanchez-terrazas Jonathan | — | (209) 588 6506 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Santay | Peter Wyeth Koehler | — | (510) 461 0424 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Sawyer Tree Management | Clayton Arthur Mermod | — | (209) 743 6482 | Tree | Sonora · Tuolumne County | — | — |
| Schram Painting INC | Nathan Edwin Schram | — | (209) 743 1496 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Scott Timber Contracting INC | Frank Eugene Jr Scott | — | (209) 768 6615 | Tree | Mi Wuk Village · Tuolumne County | — | — |
| Sea Spray Awnings INC A California Corporation | Jessica Marlene Emmons | — | (209) 533 4315 | Other | Sonora · Tuolumne County | — | — |
| Seal-n-build INC | Richard Glenn Gilliam | — | (209) 352 9080 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Sean Daniels | Sean Daniels | — | (209) 743 0383 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Sean Mc Coy | Sean Mc Coy | — | (209) 588 1741 | Windows, patio, painters | Soulsbyville · Tuolumne County | — | — |
| Selby Cabinet Shoppe INC | Reuben Jay Selby | — | (209) 586 5523 | Other | Twain Harte · Tuolumne County | — | — |
| Seldon Construction INC | Matthew Dennis Seldon | — | (209) 753 8578 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| Sentry Alarm Systems | Sentry Alarm Systems | — | (209) 532-9662 | Alarm and generators | Sonora · Tuolumne County | — | — |
| Shadle Construction INC | Anthony Wayne Shadle | shadleconstruction@yahoo.com | (408) 483 6104 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Shelman Painting | Shelman Painting | — | (209) 768 3907 | Windows, patio, painters | Jamestown · Tuolumne County | — | — |
| Shepherd's Style Tile | Shepherd's Style Tile | — | (209) 559 2814 | Other | Sonora · Tuolumne County | — | — |
| Sierra Commercial Lighting INC | Dennis Anthony Scot Smith | info@sierracommerciallighting.com | (209) 536 4884 | Electricians | Sonora · Tuolumne County | — | — |
| Sierra Construction | Aaron Rodney Billigmeier | — | (209) 743 1365 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Sierra Decor | Sierra Decor | — | (209) 509 8700 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Sierra Hardware Products INC DBA Shp Construction Co | Jay Christopher Canavan | — | (209) 532 1801 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Sierra Landscape LLC | Jeffrey Matthew Quarle | — | (209) 588 3083 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Sierra Nevada Tint | Sierra Nevada Tint | sierranevadatint@gmail.com | (209) 352 7926 | Other | Sonora · Tuolumne County | — | — |
| Sierra Stone INC | Cathryn Hawn | — | (209) 694 8284 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Sierra Timber Frames | Sierra Timber Frames | — | (204) 352 2632 | GC, remodel, ADU | Tuolumne · Tuolumne County | — | — |
| Signet Home Inspections LLC | Signet Home Inspections LLC | — | (530) 273-1300 | Inspectors | Auburn · Tuolumne County | — | — |
| Silverado Estate Enterprises INC | Edwin Charles Burlarley | — | (209) 482 2903 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Sindelar Plumbing INC | John Allen Aldrich Sindelar | — | (209) 532 9169 | Other | Soulsbyville · Tuolumne County | — | — |