| South Coast Concrete And Waterproofing Cmp | Marco Antonio Diaz | — | (805) 857 0292 | Other | Thousand Oaks · Ventura County | — | — |
| South Coast Electric | William Frank Tinsley | — | (805) 218 1845 | Electricians | Santa Paula · Ventura County | — | — |
| South West Builders | Ronald Frederick Krofta | — | (855) 808 8887 | Electricians | Simi Valley · Ventura County | — | — |
| South West Development INC | South West Development INC | — | (818) 859 5348 | Electricians | Simi Valley · Ventura County | — | — |
| Southcoast Pool & Spa INC | Sanford Maurice Martin | — | (805) 582 1087 | Pool | Simi Valley · Ventura County | — | — |
| Southern California Builders Ii INC | Gary Victor Semolich | — | (805) 497 4497 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Southern California Screen INC | Randall Scott Wayne | — | (805) 526 2044 | Other | Simi Valley · Ventura County | — | — |
| Southland Electric | Roy Herbert Damarjian | — | (805) 233 1782 | Electricians | Camarillo · Ventura County | — | — |
| Southland Heating & Air Conditioning | Raymond Arthur Alba | — | (805) 498 6700 | HVAC | Newbury Park · Ventura County | — | — |
| Southland Home Services | Raymond Arthur Alba | — | (818) 462 4702 | HVAC | Thousand Oaks · Ventura County | — | — |
| Southland Mechanical | Southland Mechanical | — | (805) 217 4670 | HVAC | Simi Valley · Ventura County | — | — |
| Southland Pool Services | William Eugene O'neil | — | (805) 496 4477 | Pool | Thousand Oaks · Ventura County | — | — |
| Southland Sheet Metal | Southland Sheet Metal | — | (805) 657 2559 | Other | Simi Valley · Ventura County | — | — |
| Southland Tile Co | Gary Le Roy Collins | — | (805) 638 6217 | Other | Simi Valley · Ventura County | — | — |
| Southwest Concrete Construction Company | Mark Anthony Garcia | — | (805) 218 2954 | Other | Ventura · Ventura County | — | — |
| Southwest Heating & Air Conditioning | Southwest Heating & Air Conditioning | — | (805) 420 8628 | HVAC | Fillmore · Ventura County | — | — |
| Southwest Pavingstone | Southwest Pavingstone | info@southwestpavingstone.com | (805) 813 1873 | Other | Simi Valley · Ventura County | — | — |
| Southwest Pool N' Spa INC | Robert George Bourne | info@mysite.com | (805) 402 1316 | Pool | Moorpark · Ventura County | — | — |
| Southwest Waterproofing | Southwest Waterproofing | — | (805) 766 1564 | Other | Oxnard · Ventura County | — | — |
| Sovi INC | Kerry Todd Devenport | — | (805) 722 4364 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Spark Line Electric | Mynor Ezequiel Gonzalez Flores | — | (818) 305 0600 | Electricians | Simi Valley · Ventura County | — | — |
| Sparkey's Electric INC | Steven Paul Olson | — | (805) 300 7671 | Electricians | Newbury Park · Ventura County | — | — |
| Sparks Electric | Charles Foster Sparks | — | (805) 300 3014 | Electricians | Newbury Park · Ventura County | — | — |
| Sparky Crew Electric | Flores Luis Alvarado | — | (805) 307 6662 | Electricians | Oxnard · Ventura County | — | — |
| Spartan Construction | Michael Damien Alvarez | — | (805) 587 2105 | Electricians | Simi Valley · Ventura County | — | — |
| Spaulding Backflow Company | Tyler Anthony Spaulding | — | (805) 660 5988 | Other | Thousand Oaks · Ventura County | — | — |
| Spaulding Pacific | Spaulding Pacific | — | (805) 732 0643 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Spec 4 Heating & Cooling | Spec 4 Heating & Cooling | — | (805) 760 6330 | HVAC | Oxnard · Ventura County | — | — |
| Specialized Landscape Management Services INC | Rene Jesus Emeterio | — | (805) 520 7590 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Specialized Remodeling | Specialized Remodeling | — | (805) 988 8993 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Specialty Communications And Electronics INC | Roderick Eugene Roy | — | (805) 577 7551 | Other | Simi Valley · Ventura County | — | — |
| Specialty Refinish & Tub INC | Ricardo Alejandro Burgos | — | (323) 350 4794 | Other | Thousand Oaks · Ventura County | — | — |
| Spellman Electric | Eric Duane Spellman | — | (805) 402 6464 | Electricians | Simi Valley · Ventura County | — | — |
| Spencer Commercial Electric INC | Joseph Patrick Spencer | — | (805) 231 8605 | Electricians | Camarillo · Ventura County | — | — |
| Spencer Construction INC | Rayner Spencer | — | (805) 407 3405 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Spencer Douglas Ford | Spencer Douglas Ford | — | (805) 340 0310 | Other | Ventura · Ventura County | — | — |
| Sperber Landscape Companies LLC | Richard Allen Sperber | — | (310) 579 6154 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Sperber Landscape Services | Spencer William Bemus | — | (310) 579 6154 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| Spielman Communications | Spielman Communications | — | (805) 587 9627 | Other | Simi Valley · Ventura County | — | — |
| Spl Landscape INC | Ramos Linares Wilfredo | — | (805) 776 2248 | Windows, patio, painters | Ventura · Ventura County | — | — |