| W C Service Company INC | Bruce Robert Stanley | accounting@wcservice.com | (805) 579 3400 | Other | Simi Valley · Ventura County | — | — |
| W E Mapes Construction INC | William Earl Mapes | — | (805) 522 7131 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| W F B Real Estate Services INC | I Jay Kerner | — | (818) 632 0485 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| W H Construction | Hernandez William | — | (805) 469 4629 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| W H Tech Services INC | N Wade Horigan | wade@whtechservices.com | (805) 320 4801 | Electricians | Ventura · Ventura County | — | — |
| W J Larimer Construction INC | Wesley Don Larimer | — | (805) 368 3679 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| W L Rubottom Co | Jay Benjamin Mccoy | contact@wlrubottom.com | (800) 648 6943 | Other | Ventura · Ventura County | — | — |
| W R A Construction INC | Raymond Francis Jr Barrow | mbarrow@wraconstruction.com | (805) 419 3401 | Other | Camarillo · Ventura County | — | — |
| W S E Construction | David Armando Lopez | — | (805) 207 5233 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| W S E Construction | William Scott Jr Evans | — | (805) 732 9372 | GC, remodel, ADU | Moorpark · Ventura County | — | — |
| W S E INC | Aaron Wesley Bush | — | (805) 798 7453 | Electricians | Oxnard · Ventura County | — | — |
| W W And Son Electric INC | John Charles Jr Whitmore | — | (805) 480 3349 | Electricians | Thousand Oaks · Ventura County | — | — |
| Wagemann Construction Co | Michael Thomas Wagemann | — | (805) 290 5733 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Wahoo Tile Roof CleaningProtected | Aaron Mark Kennedy | — | (805) 320 1100 | Tile roofers | Camarillo · Ventura County | — | — |
| Waite Bros Plumbing | Thomas Roger Waite | — | (805) 495 4501 | Other | Newbury Park · Ventura County | — | — |
| Wakiyan Flooring Installations | Wakiyan Flooring Installations | — | (909) 693 0447 | Other | Oxnard · Ventura County | — | — |
| Walgren Tile | Walgren Tile | — | (661) 263 1205 | Other | Simi Valley · Ventura County | — | — |
| Walker Construction | Brian William Johnson | — | (818) 388 5554 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Walker Electrical Contractor | John Michael Walker | astigma@astigmatic.com | (805) 428 2082 | Electricians | Simi Valley · Ventura County | — | — |
| Walker Home Remodeling INC | Daniel Bernard Walker | — | (805) 493 4900 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Walker Pools Incorporated | Steven Joseph Walker | — | (805) 501 4587 | Pool | Moorpark · Ventura County | — | — |
| Walker Strux INC | Austin Lee Walker | — | (805) 767 2827 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Wall 2 Wall Floor Covering | Wall 2 Wall Floor Covering | — | (805) 290 5083 | Other | Oxnard · Ventura County | — | — |
| Wallock & Maggio INC | Christopher Gerard Wallock | — | (805) 499 5960 | Other | Thousand Oaks · Ventura County | — | — |
| Wallworks Drywall | Tyler John Junge | — | (805) 432 1589 | Other | Simi Valley · Ventura County | — | — |
| Wallworx Paint Co. | Wallworx Paint Co. | — | (805) 650-1890 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Wally Carter And Son | Wally Carter And Son | — | (805) 338 7297 | Other | Newbury Park · Ventura County | — | — |
| Wallz Ark Construction | Paredes Aguirre Arturo | — | (805) 253 4054 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Walt Construction Corporation | Waldo Jose Perwz | — | (818) 700 1050 | HVAC | Simi Valley · Ventura County | — | — |
| Walter Russell Hedrick | Walter Russell Hedrick | — | (805) 405 7063 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Waltom Construction INC | Walter Edwin Calhoun | — | (805) 383 2888 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Ward Corporation | Gary Wayne Ward | — | (805) 921 0822 | Other | Santa Paula · Ventura County | — | — |
| Wards American Building Concepts INC | Havialh Jacinth Mcgrath | — | (805) 340 2842 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Warren Bonney | Warren Bonney | — | (805) 794 4526 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Warren Built Construction Landscape & Design | Jason Michael Warren | — | (805) 499 7665 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Warren Hall Construction | Warren Jerome Hall | — | (805) 218 7999 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Wasteline Plumbing INC | Julio Zezar Hernandez | — | (805) 304 8229 | Other | Simi Valley · Ventura County | — | — |
| Water Damage Services | Water Damage Services | — | (800) 934-8000 | Restoration | Ventura · Ventura County | — | — |
| Water Expressions INC | Richard Rand La Secla | — | (805) 402 4357 | Pool | Thousand Oaks · Ventura County | — | — |
| Water Pro Drinking Water Systems | Water Pro Drinking Water Systems | — | (805) 258 1646 | Other | Oxnard · Ventura County | — | — |