| Shackelford Pest Control | Shackelford Pest Control | shackelfordpestcontrol@gmail.com | (530) 671-4040 | Pest, tile roofs | Plumas Lake · Plumas County | — | — |
| Sierra Cascade Aggregate & Asphalt Products INC | Caleb Edward Holland | — | (530) 258 4555 | Other | Chester · Plumas County | — | — |
| Sierra Construction And Equipment | Gary Frank Strecker | — | (530) 249 1816 | GC, remodel, ADU | Greenville · Plumas County | — | — |
| Sierra Earthworks INC | Jason Roaten Hinson | agustinamingote@gmail.com | (530) 836 4213 | Windows, patio, painters | Blairsden · Plumas County | — | — |
| Sierra Garage Door Service INC | David Stefan Smith | — | (916) 786 3034 | Other | Portola · Plumas County | — | — |
| Sierra Home Inspections | Sierra Home Inspections | eben@eyebytes.com | (520) 575-0734 | Inspectors | Portola · Plumas County | — | — |
| Sierra Institute For Community And Environment | Sierra Institute For Community And Environment | info@sierrainstitute.us | (530) 284-1022 | Restoration | Taylorsville · Plumas County | — | — |
| Sierra Moon Enterprises | Michael Stephen Kelly | — | (530) 927 7428 | GC, remodel, ADU | Quincy · Plumas County | — | — |
| Sierra Pool & Spa | Sierra Pool & Spa | contact@sierrapoolandspa.com | — | Pool | Quincy · Plumas County | — | — |
| Sierra Ridge Flooring Company | William Craig Auldridge | — | (530) 414 4547 | Other | Chilcoot · Plumas County | — | — |
| Sierra Valley Enterprises INC | Abel Villagomez | — | (530) 308 5467 | Windows, patio, painters | Portola · Plumas County | — | — |
| Sierra Valley Hot Tub Service | Christopher Lloyd Penrose | — | (530) 448 3979 | Pool | Vinton · Plumas County | — | — |
| Sittre Excavating INC | Keith Loyd Mc Cauley | — | (530) 308 9570 | Other | Portola · Plumas County | — | — |
| Slusher INC DBA Slusher Plumbing Heating Cooling Electric | Constance Marie Golden Slusher | — | (530) 258 3474 | HVAC | Chester · Plumas County | — | — |
| Spanish Peak Painting | Spanish Peak Painting | spanishpeakpaint@yahoo.com | (530) 616 0710 | Windows, patio, painters | Meadow Valley · Plumas County | — | — |
| Spurs Trucking & Equipment INC | Megan Rae Neer | — | (775) 771 5493 | Other | Greenville · Plumas County | — | — |
| Stars Quality Roofing | Miguel Angel Sanchez Castro | — | (530) 616 0980 | Other roofers | Quincy · Plumas County | — | — |
| Sugarloaf Ranch And Cabinets | Sugarloaf Ranch And Cabinets | — | (530) 927 8801 | Other | Portola · Plumas County | — | — |
| Summit Construction | Robert David Terry | — | (907) 687 1090 | GC, remodel, ADU | Portola · Plumas County | — | — |
| Summit Plumbing | Summit Plumbing | — | (530) 386 3232 | Other | Portola · Plumas County | — | — |
| T C B Construction | Toby Todd Brummer | — | (530) 280 1125 | GC, remodel, ADU | Quincy · Plumas County | — | — |
| Taylor Designs & Const | Taylor Designs & Const | — | (530) 521 0734 | GC, remodel, ADU | Greenville · Plumas County | — | — |
| Terry Parsons | Terry Parsons | — | (530) 258 9447 | GC, remodel, ADU | Chester · Plumas County | — | — |
| The English Mason | The English Mason | — | (530) 258 6611 | Other | Greenville · Plumas County | — | — |
| The Painter Man | The Painter Man | — | (858) 335-9529 | Windows, patio, painters | Valley Center · Plumas County | — | — |
| The Paper Dolls | The Paper Dolls | — | (530) 249 2146 | Other | Portola · Plumas County | — | — |
| Thomas David Hall | Thomas David Hall | — | (530) 545 3003 | Other | Quincy · Plumas County | — | — |
| Tim Bohl | Tim Bohl | — | (530) 258 3066 | Other | Chester · Plumas County | — | — |
| Timber Line Structures | Timber Line Structures | — | (530) 283 2088 | GC, remodel, ADU | Quincy · Plumas County | — | — |
| Topper's Tree Service | David Brian Sims | — | (530) 394 8233 | Tree | Quincy · Plumas County | — | — |
| Tree Wrangler Service LLC | Kevin Christopher Cook | — | (775) 600 3611 | Other | Cromberg · Plumas County | — | — |
| Trusolution Pest Control | Trusolution Pest Control | trusolutionpest@gmail.com | — | Pest, tile roofs | Plumas Lake · Plumas County | — | — |
| Tyrus Chimney Sweep | Tyrus Chimney Sweep | — | (530) 927-7459 | Other | Quincy · Plumas County | — | — |
| Universal Electric | Ian Thomas Upton | ian@universalelectric.biz | (530) 816 0685 | Electricians | Chester · Plumas County | — | — |
| Volcano View Tree Service | Trevor Richter Roberts | — | (530) 816 0049 | Other | Chester · Plumas County | — | — |
| Walker Meyers Construction | Walker Anderson Meyers | — | (530) 521 2067 | GC, remodel, ADU | Greenville · Plumas County | — | — |
| Waller Painting | Waller Painting | — | (530) 249 4703 | Windows, patio, painters | Portola · Plumas County | — | — |
| Watts Up Electric | Deron Charles Amos | — | (530) 927 7188 | Electricians | Quincy · Plumas County | — | — |
| Wesfab Construction | Wesley Scott Boyd | — | (530) 592 8315 | GC, remodel, ADU | Portola · Plumas County | — | — |
| Wilburn Construction INC | Timothy Wayne Mannies | matthewwilburn89@gmail.com | (530) 283 7420 | GC, remodel, ADU | Quincy · Plumas County | — | — |