| Stoffel Tile Company | Justin Charles Stoffel | — | (805) 712 6464 | Other | Atascadero · San Luis Obispo County | — | — |
| Stone By Stone Home Services | Robert Joseph Stone | — | (805) 215 0677 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Stone Coast Masonry | Stone Coast Masonry | — | (805) 459 7479 | Other | Cambria · San Luis Obispo County | — | — |
| Stone Tech | Stone Tech | — | (805) 710 3763 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Stone-work's Construction | Skye Emerson Stone | — | (805) 528 0363 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Story Builders INC | Marc A Story | — | (805) 540 9687 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Story's Construction | Rodney Edwin Story | — | (805) 528 5641 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Stout Pump Service LLC | Daniel Robert Stout | — | (805) 550 9419 | Other | Paso Robles · San Luis Obispo County | — | — |
| Stover Tile And Design | Stover Tile And Design | — | (805) 234 1381 | Other | Morro Bay · San Luis Obispo County | — | — |
| Straight Line Painting | Straight Line Painting | interested@domainmarket.com | (323) 327 3428 | Windows, patio, painters | Arroyo Grande · San Luis Obispo County | — | — |
| Strickdev | Strickland Bryan | — | (805) 709 0102 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Strole's Tri-service | Eric Edmond Monson | info@strolestriservice.com | (805) 466 5509 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Stromsoe Lath And Plaster | Stromsoe Lath And Plaster | — | (805) 930 7957 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Strong Tower Painting | Strong Tower Painting | — | (805) 503 9335 | Windows, patio, painters | Pismo Beach · San Luis Obispo County | — | — |
| Struktur Build Company LLC | Ian J Corcorran | ian@strukturbuild.com | (425) 344 7423 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Stuart Floors | Anthony Matthew Stuart | — | (805) 610 8451 | Other | Templeton · San Luis Obispo County | — | — |
| Sullivan William | Sullivan William | — | (805) 801 4587 | Other | Creston · San Luis Obispo County | — | — |
| Summit Sdi | Robert Fulton Mueller | — | (805) 597 5100 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Sumner Construction | Patrick James Sumner | — | (805) 459 8598 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Sun Pacific | Robert Blaine Fraser | consumerrelations@sunpacific.com | (805) 772 9132 | HVAC | Morro Bay · San Luis Obispo County | — | — |
| Sundance Ceramic Tile And Stone | Sundance Ceramic Tile And Stone | — | (805) 769 7037 | Other | Cayucos · San Luis Obispo County | — | — |
| Sundance Company | Keith Randall Fairey | sales@sundance.com | (831) 673 1410 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Sunny San Luis Roofing | Sunny San Luis Roofing | — | (805) 790-8658 | Other roofers | San Luis Obispo · San Luis Obispo County | — | — |
| Sunrise Coatings | Sunrise Coatings | — | (805) 714 3247 | Other | Nipomo · San Luis Obispo County | — | — |
| Sunrise Coatings INC | Bryan Allen Howell | — | (805) 234 7228 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Sunset Painting | Sunset Painting | — | (805) 792 0907 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Superior Fire Sprinkler INC | Lloyd Dean Jr Parrish | — | (805) 550 6620 | Other | Nipomo · San Luis Obispo County | — | — |
| Superior Painting & Sons INC | Perales Robert | — | (805) 931 0911 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Sure Line Electric INC | Kevin Gabriel Clarke | — | (805) 709 4642 | Electricians | Atascadero · San Luis Obispo County | — | — |
| Surface Painting Co | Bryan Gregory Lewis | — | (310) 433 9275 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Svennungsen Construction | Steinar Joel Svennungsen | — | (805) 748 1032 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| Sweat Equity Construction & Salvage | Charles Frederick Watkins | — | (805) 441 4540 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Swift Heating And Air INC | Daryl Alan Swift | — | (805) 704 5572 | HVAC | Atascadero · San Luis Obispo County | — | — |
| Sycamore Construction & Design | Dan Peter Guthrie | — | (805) 748 1873 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Synergy Woodworks | Synergy Woodworks | — | (805) 888 7431 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| T B H Construction | Tyler Brandon Huisken | — | (805) 627 4550 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| T B W Of S L O INC DBA Brushworks Painting | Wayne Randall Johnson Smith | — | (805) 541 6008 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| T G P Water Systems | Mitchell William Torp | — | (805) 238 2145 | Other | Paso Robles · San Luis Obispo County | — | — |
| T Howell Construction | Troy Jeffrey Howell | — | (805) 801 6480 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| T J Chitwood | T J Chitwood | — | (805) 709 7447 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |