| Star Janitorial | Star Janitorial | — | (209) 622 7078 | Other | Turlock · Stanislaus County | — | — |
| Stark Painting | Stark Painting | — | (209) 577 8180 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Statewide Construction | Quintero Jorge | — | (209) 596 6287 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Steelco Construction | Timothy James Armstrong | — | (209) 526 2566 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Steelpro Specialties INC | Art Garza Gonzales | aaron@steelprospecialties.com | (209) 669 7855 | Other | Turlock · Stanislaus County | — | — |
| Stetler Construction LLC | Jeffrey Brenden Stetler | info@stetlerconstruction.com | (209) 886-4146 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Steve Caporgno | Steve Caporgno | — | (209) 604 5680 | Other | Modesto · Stanislaus County | — | — |
| Steve Guerrero's Landscape Services | Raymond Steven Guerrero | — | (209) 663 1949 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Steve N Boj-sode | Steve N Boj-sode | — | (209) 556 3553 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Steve's Construction | Steven Ruiz Rodriguez | — | (209) 225 7682 | GC, remodel, ADU | Newman · Stanislaus County | — | — |
| Steve's Stucco INC | Steven Earl Patrick | — | (209) 765 5784 | Other | Ceres · Stanislaus County | — | — |
| Stf Iron INC | Antony Jr Konefat | — | (209) 874 6140 | Other | Modesto · Stanislaus County | — | — |
| Stillman Plumbing Company | Woodrow Lee Stillman | — | (209) 595 3456 | Other | Oakdale · Stanislaus County | — | — |
| Stl Investments INC DBA Pl Construction | Bineet Singh Sarang | — | (847) 417 7200 | Electricians | Modesto · Stanislaus County | — | — |
| Stone Beauty INC | Rene Robles Garibay | — | (209) 275 2288 | Other | Modesto · Stanislaus County | — | — |
| Stone Tile Services | Kirstan Marie Tenbrink | — | (209) 968 7610 | Other | Modesto · Stanislaus County | — | — |
| Straight Fence INC | Rafael Mendez-Lara | — | (209) 587 3564 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Strong Structural Steel | Strong Structural Steel | — | (209) 380 5385 | Other | Modesto · Stanislaus County | — | — |
| Strong Tower Masonry INC | Jose Joel Cervantes Gaspar | — | (562) 616 3234 | Other | Modesto · Stanislaus County | — | — |
| Strongbuilt Construction INC | Uribe Orlando Valdez | — | (209) 541 7506 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Stuart Mc Clanahan Construction | Stuart Nelson Mc Clanahan | — | (209) 604 9822 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Stucco Specialties INC | Edgar Aranda | — | (209) 739 0832 | Other | Modesto · Stanislaus County | — | — |
| Studio Build Construction INC | Marina Galvez | — | (650) 274 9103 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Stump Construction & Manufacturing INC A California Corporation | Matthew Edward Stump | — | (209) 596 4029 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Suarez Tree Service LLC | Lopez Fernando Suarez | info@suareztreeservice.com | (415) 323 8866 | Other | Modesto · Stanislaus County | — | — |
| Sully's Locksmith | Sully's Locksmith | — | (209) 996 0529 | Other | Oakdale · Stanislaus County | — | — |
| Summit Framing | Summit Framing | — | (209) 552 6911 | Other | Modesto · Stanislaus County | — | — |
| Summit Heating & Air | Summit Heating & Air | — | (209) 613 9010 | HVAC | Modesto · Stanislaus County | — | — |
| Summit Plumbing And Mechanical Corporation | Shelly Antoinette Dewilms | — | (209) 522 3764 | HVAC | Modesto · Stanislaus County | — | — |
| Sun Valley Pumping | Sun Valley Pumping | sunvalee5@aol.com | (209) 667 8010 | Other | Turlock · Stanislaus County | — | — |
| Sun Valley Pumping INC | Richard Michael Borrelli | sunvalee5@aol.com | (209) 652 4561 | Other | Turlock · Stanislaus County | — | — |
| Sunlectric INC | Joseph Charles Gordo | — | (209) 565 4786 | Electricians | Oakdale · Stanislaus County | — | — |
| Sunset Landscaping Services INC | Marcus Robert Figueroa | — | (209) 480 0206 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Sunset Valley Landscape INC | Erika Yazmin Garcia Quintero | — | (408) 648 8552 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Sunshine Painting | Sunshine Painting | — | (408) 375 5555 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Sunstate Plumbing INC | Osvaldo Vasquez | — | (209) 648 7656 | Other | Turlock · Stanislaus County | — | — |
| Sunstone Landscaping And Design | Sunstone Landscaping And Design | — | (209) 262 5608 | Windows, patio, painters | Turlock · Stanislaus County | — | — |
| Superior Flooring INC | Ramirez Armando Medina | — | (209) 405 8910 | Other | Modesto · Stanislaus County | — | — |
| Superior Kitchen Cabinets INC | Noah Raul Ramirez | — | (209) 247 0097 | Other | Turlock · Stanislaus County | — | — |
| Superior Systems | Superior Systems | info@superiorsystems.com | (209) 556 0777 | HVAC | Ceres · Stanislaus County | — | — |