| Secor Painting | Secor Painting | — | (805) 202 6003 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Secura - Com | Secura - Com | — | (805) 432 6456 | Electricians | Thousand Oaks · Ventura County | — | — |
| Secure It Construction Co | Kevin Richard Bartholomew | — | (805) 522 3333 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Secure Sheet Metal INC | Robert Allen Riepe | — | (818) 341 8100 | Other | Simi Valley · Ventura County | — | — |
| Secure Systems Integration | Robert Duarte | — | (805) 375 1600 | Electricians | Westlake Village · Ventura County | — | — |
| Secured Connections Electric INC | Gerald Clayton Burch | — | (805) 857 9777 | Electricians | Simi Valley · Ventura County | — | — |
| Securitas Security Services Usa City Center | Securitas Security Services Usa City Center | — | (805) 650-6285 | Alarm and generators | Ventura · Ventura County | — | — |
| Security Camera Tech Ventura | Security Camera Tech Ventura | — | (805) 539-0234 | Alarm and generators | Ventura · Ventura County | — | — |
| Security Contractors INC | Anthony Joseph Jr Mattivi | — | (818) 612 0536 | Alarm and generators | Westlake Village · Ventura County | — | — |
| Security Paving Company INC | Anthony Joseph Mattivi | northern@securitypaving.com | (818) 362 9200 | Alarm and generators | Westlake Village · Ventura County | — | — |
| See - Me Overhead | See - Me Overhead | — | (805) 582 1465 | Other | Simi Valley · Ventura County | — | — |
| Seethru Glazing INC | Daniel Gene Merlo | seethruglazing@gmail.com | (805) 428 0599 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Segovia Electric | Charles Eric Segovia | — | (805) 236 2034 | Electricians | Oxnard · Ventura County | — | — |
| Sekerka & Sons | Sekerka Lukas | — | (805) 981 8886 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Select Window Films | Select Window Films | — | (800) 823 2634 | Other | Simi Valley · Ventura County | — | — |
| Semaphoric INC | Matthew Edward Mc Kenna | — | (818) 716 2852 | Electricians | Thousand Oaks · Ventura County | — | — |
| Semper Plumbing INC | Salvador Mora | — | (805) 760 9529 | Other | Camarillo · Ventura County | — | — |
| Sentinel Environmental Solutions INC | Daniel Joseph Treptow | — | (805) 402 4037 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Seper Blinds LLC | Sepehr Rasekh | — | (310) 294 3538 | Other | Moorpark · Ventura County | — | — |
| Serafin Salomon Jr | Serafin Salomon Jr | — | (805) 482 7960 | Other | Camarillo · Ventura County | — | — |
| Serenity Scapes | Serenity Scapes | — | (805) 526 9361 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Sergent's Mechanical Systems INC | Justin Richard Legere | — | (805) 486 4562 | HVAC | Santa Paula · Ventura County | — | — |
| Sergio Prado | Sergio Prado | — | (818) 657 9787 | Other | Moorpark · Ventura County | — | — |
| Sergio Salguero | Sergio Salguero | — | (805) 587 9652 | Other roofers | Simi Valley · Ventura County | — | — |
| Serino Commercial Contractors INC | Richard Joseph Serino | — | (805) 529 2630 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Service Giant | Justin Jake Pribillo | — | (818) 488 1572 | HVAC | Simi Valley · Ventura County | — | — |
| Service Pro Integrated Systems INC | Preston Eugene Lewis | — | (805) 889 8164 | Electricians | Oxnard · Ventura County | — | — |
| Service Tech | Craig W Heidenthal | — | (805) 526 1262 | Other | Simi Valley · Ventura County | — | — |
| Service-pro Fire Protection INC | Armando Esteban Jimenez | — | (805) 487 1477 | Other | Oxnard · Ventura County | — | — |
| Servicemart | Patrick Lee Rooney | — | (805) 748 0178 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Servicemaster Restore By Restoration Pros | Tarek Fouad Nehme | — | (805) 388 1409 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Servpro Of Northwest Ventura County | Servpro Of Northwest Ventura County | — | (805) 436-6143 | Restoration | Ventura · Ventura County | — | — |
| Servpro Of Thousand Oaks | Michael Ray Brooks | — | (805) 492 2434 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Servpro Of Ventura | Servpro Of Ventura | — | (805) 436-6139 | Restoration | Ventura · Ventura County | — | — |
| Servpro Of Wilshire Center | Christopher Rodger Jones | — | (805) 302 6745 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Sespe Air Systems | Connor James Gehrke | — | (805) 607 0449 | HVAC | Oxnard · Ventura County | — | — |
| Sespe Plumbing And Rooter INC | Jose Silvano Duenas | — | (805) 524 3721 | Other | Fillmore · Ventura County | — | — |
| Sespe Power Solutions INC | Curtis Evan Kwast | hello@sespepowersolutions.com | (805) 651-0783 | Electricians | Ventura · Ventura County | — | — |
| Sespe Roofing Company | David Christopher Hoslett | — | (805) 524 2990 | Other roofers | Fillmore · Ventura County | — | — |
| Sespe Striping | Sespe Striping | — | (805) 258 8846 | Other | Ojai · Ventura County | — | — |