| Straight Up Construction INC | John Joseph Mederos | — | (510) 714 4111 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Straw Hat Builders | Vincent James Van Harken | — | (818) 726 5836 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Streamline Construction | Jesse James Mc Kenna | dexignexpert@gmail.com | (530) 272 6806 | Electricians | Grass Valley · Nevada County | — | — |
| Streamline Electrical LLC | Brian Patrick Vincent | — | (530) 386 1198 | Electricians | Truckee · Nevada County | — | — |
| Streamscapes INC | Tyler Lee Brown | — | (530) 816 0484 | Pool | Truckee · Nevada County | — | — |
| Struck Engineering | Struck Engineering | — | (530) 386 8022 | Other | Truckee · Nevada County | — | — |
| Structerra INC | Brian Thomas Rickauer | info@structerra.com | (530) 550 1142 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Structural Glass Installation INC | Gerald Lee Swartz | — | (530) 802 5263 | Windows, patio, painters | Cedar Ridge · Nevada County | — | — |
| Stuart Monahan Construction | Stuart Joseph Monahan | — | (530) 280 0600 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Sullivan Electric | Robert Dean Sullivan | — | (530) 308 4158 | Electricians | Grass Valley · Nevada County | — | — |
| Summit Builders | Summit Builders | — | (530) 587 2167 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Summit Drywall | Summit Drywall | — | (530) 582 8407 | Other | Truckee · Nevada County | — | — |
| Summit Electrical Solutions | Jacob Ian Somervell | — | (530) 414 1651 | Electricians | Truckee · Nevada County | — | — |
| Summit Ridge Builders | Summit Ridge Builders | — | (530) 613 7624 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Summit Services LLC | Ryan Lawrence Salmonson | — | (916) 740 5134 | Electricians | Soda Springs · Nevada County | — | — |
| Summit Tile | Summit Tile | — | (530) 271 7460 | Other | Grass Valley · Nevada County | — | — |
| Sun Mountain Landscaping | Sun Mountain Landscaping | — | (530) 414 3559 | Windows, patio, painters | Truckee · Nevada County | — | — |
| Sun Power Construction INC | Kevin Patrick Farrell | kevin@sunpowerconstruction.com | (530) 848 4027 | HVAC | Truckee · Nevada County | — | — |
| Sun's Roofing | Joseph Iron Eagle Kennard | sunsroofing@gmail.com | (530) 575 2359 | Other roofers | Grass Valley · Nevada County | — | — |
| Sunco Homes | Scott Michael Wallstrom | — | (530) 545 1546 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Sutherlin Construction | Christopher Lee Sutherlin | — | (530) 262 3155 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Sweet Pea Regenerative Landscaping LLC | Samuel Austin Mohun | — | (530) 414 1034 | Windows, patio, painters | Truckee · Nevada County | — | — |
| System Solutions | System Solutions | — | (916) 677 9655 | Other | Grass Valley · Nevada County | — | — |
| Szekely Construction | Michael Richard Szekely | — | (530) 265 6571 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| T C & K P Construction | Kenneth Ray Painter | — | (530) 277 9266 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| T Cal Builders INC | Pedro Iniguez-Apolinar | — | (530) 386 7832 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| T D Landscape | T D Landscape | — | (916) 997 3502 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| T G Pratt Builders | T G Pratt Builders | — | (530) 210 8202 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| T K Painting Services | David William Horton | — | (530) 386 2383 | Windows, patio, painters | Truckee · Nevada County | — | — |
| T M Wallace Construction | Trevor Matthew Wallace | — | (530) 368 2779 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| T N Construction INC | Timothy Neal Tygart | — | (530) 265 4357 | GC, remodel, ADU | Cedar Ridge · Nevada County | — | — |
| T Pinto LLC DBA Condor Builders | Omri Dror | — | (424) 344 8023 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| T R Enterprises | Jerry Richard Roper | info@trenterprises.com | (530) 575 1606 | GC, remodel, ADU | Rough And Ready · Nevada County | — | — |
| T Ross Construction | Thomas Miller Jr Ross | — | (530) 386 1303 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| T W Electric | James Tyler Wright | — | (775) 313 1515 | Electricians | Truckee · Nevada County | — | — |
| T.r.b Construction INC | Trevor Ryan Brooks | — | (530) 536 6740 | Electricians | Truckee · Nevada County | — | — |
| Tahoe Blue Plumbing | Tahoe Blue Plumbing | — | (775) 287 9349 | Other | Truckee · Nevada County | — | — |
| Tahoe Chimney & Fireplace | Tahoe Chimney & Fireplace | — | (530) 386 5955 | Other | Truckee · Nevada County | — | — |
| Tahoe Forrest Electric | Forrest Patrick Keating | — | (530) 913 7198 | Electricians | Truckee · Nevada County | — | — |
| Tahoe Ridge Electric | Geremy Jacob Johnston | tahoeridg_electric@outlook.com | (530) 386 8870 | Electricians | Truckee · Nevada County | — | — |