| Shores Plumbing | Shores Plumbing | — | (805) 822 2351 | Other | Oxnard · Ventura County | — | — |
| Showcase Design Build INC | Daryl Jean Rice | — | (805) 386 8000 | GC, remodel, ADU | Somis · Ventura County | — | — |
| Showcase Hardwood Floors | Showcase Hardwood Floors | — | (805) 649 4093 | Other | Oak View · Ventura County | — | — |
| Shozo Tile And Mosaic Design | Shozo Tile And Mosaic Design | — | (805) 204 7625 | Other | Oxnard · Ventura County | — | — |
| Shumar Hardwood Floors | Shumar Hardwood Floors | — | (818) 634 1273 | Other | Thousand Oaks · Ventura County | — | — |
| Shur Roofing Company | Timothy Harry Shur | — | (805) 647 2813 | Other roofers | Ventura · Ventura County | — | — |
| Siena Electric | Moalej Mohammad | — | (818) 430 7278 | Electricians | Simi Valley · Ventura County | — | — |
| Sierra Barricade Service INC | Terry Sierra Quinones | — | (805) 983 1404 | Other | Somis · Ventura County | — | — |
| Sierra Commercial Plumbing INC | Randy Jenkins | — | (805) 527 9117 | HVAC | Simi Valley · Ventura County | — | — |
| Sierra Drywall INC | Randall Wayne De Bruler | — | (805) 857 4485 | Other | Simi Valley · Ventura County | — | — |
| Sierra Pacific Design | James Lee Gunckel | — | (818) 674 9380 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Sierra Painting | Sierra Painting | — | (805) 946 6270 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Sierra Property Management | Keith Gregory Macleod | interested@domainmarket.com | (805) 340 1953 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Sierra Santa Construction INC | Jose Concepcion Soto | — | (805) 766 0926 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Sierra Traffic Service INC | Terry Sierra Quinones | — | (805) 983 1404 | Other | Somis · Ventura County | — | — |
| Sierra West Construction | Martin Robert Gravelin | ed.sierrawest@gmail.com | (805) 657 8085 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Signarama | Lamont Eugene Hollins | — | (805) 581 6332 | Other | Simi Valley · Ventura County | — | — |
| Signature Finish Carpentry INC | Ryan Christopher Walsh | — | (805) 558 0551 | Other | Simi Valley · Ventura County | — | — |
| Signet Controls INC | Navin Maniklal Kashyap | info@signetcontrols.com | (818) 859 9999 | HVAC | Thousand Oaks · Ventura County | — | — |
| Silver Development & Associates INC | Scott Robert Silver | — | (805) 646 6920 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Silver Stars Construction INC | Asha Lorkalantari | — | (310) 347 9290 | Electricians | Thousand Oaks · Ventura County | — | — |
| Silver Strand Gardens INC | Suzanne Weston Jellison | — | (805) 340 9668 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Silver Tree Services INC | Norma Angelica Elenes | — | (805) 844 7475 | Tree | Port Hueneme · Ventura County | — | — |
| Simi 4 Woodworks INC | James Joeseph Driscoll | — | (805) 526 8329 | Other | Simi Valley · Ventura County | — | — |
| Simi Valley Backflow INC | Nicholas Campbell Wiltfong | — | (805) 206 6740 | Other | Simi Valley · Ventura County | — | — |
| Simi Valley Emergency Plumbing INC | Nicholas Campbell Wiltfong | simiemergplumbing@gmail.com | (805) 206 1287 | Other | Simi Valley · Ventura County | — | — |
| Simi Valley Floors | Jose Antonio Serratos | — | (818) 987 1654 | Other | Simi Valley · Ventura County | — | — |
| Simi Valley Glass And Mirror | Jason Matthew Simoneau | — | (805) 526 8099 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Simi Valley Lock And Key | Simi Valley Lock And Key | — | (805) 527 9411 | Other | Simi Valley · Ventura County | — | — |
| Simi Valley Plumbing INC | Robert Glenn Purdum | — | (805) 522 7047 | Other roofers | Simi Valley · Ventura County | — | — |
| Simi Woodworks | Simi Woodworks | — | (805) 587 6007 | Other | Simi Valley · Ventura County | — | — |
| Simple Shade INC | Todd Wayne Fairchild | — | (805) 207 6624 | Other | Camarillo · Ventura County | — | — |
| Simplex Sheet Metal | Simplex Sheet Metal | — | (805) 559 4308 | Other | Simi Valley · Ventura County | — | — |
| Simpson Housemovers INC | Robert Alton Simpson | — | (805) 732 7321 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Sinclair Electric - 24/7 Electrician Services | Sinclair Electric - 24/7 Electrician Services | — | (805) 758-5806 | Electricians | Oxnard · Ventura County | — | — |
| Sk Plumbing & Mechanical INC | Carl Brent Shido | — | (805) 404 8011 | Other | Simi Valley · Ventura County | — | — |
| Skenderian Construction | Jamie Niles Skenderian | — | (805) 504 7892 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Sketchley & Mason INC | Jeffrey Gene Riddle | — | (818) 806 6232 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Skidmore Masonry INC | John Thomas Skidmore | — | (805) 484 4881 | Other | Camarillo · Ventura County | — | — |
| Skillwell Construction | Jonathan Martin Chavez | — | (805) 304 6420 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |