| West Point Landscape | West Point Landscape | — | (805) 873 7601 | Windows, patio, painters | Santa Paula · Ventura County | — | — |
| West Prestige Plastering | West Prestige Plastering | — | (805) 663 8463 | Other | Port Hueneme · Ventura County | — | — |
| West Prime Builders | Lozano Andres Davila | — | (805) 822 3573 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| West Wood Construction Co | Reginald Arthur Jr Wood | — | (805) 890 0524 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Western Asphalt INC | Jaime Flores Ruiz | — | (805) 651 6878 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Western Building Contractor | Western Building Contractor | westernbuildingcontractors@gmail.com | (805) 798 5456 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Western Pacific Maintenance | Western Pacific Maintenance | — | (805) 827 3634 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Western Water Works INC | Jared Anthony Jones | — | (805) 298 3483 | Pool | Fillmore · Ventura County | — | — |
| Western Wireline INC | Curtis Gene Partain | — | (805) 641 0700 | Other | Ventura · Ventura County | — | — |
| Westlake Best Gates INC | Edilberto Antonio Salmeron Tercero | westlakebestgates@gmail.com | (805) 871 6749 | Other | Thousand Oaks · Ventura County | — | — |
| Westlake Concrete | Christoph Weigl | — | (805) 364 2594 | Other | Thousand Oaks · Ventura County | — | — |
| Westlake Drain | Garret Robert Stevens | — | (805) 843 5217 | Other | Newbury Park · Ventura County | — | — |
| Westlake Electric | James Jan Tobias | info@tobiaselectric.com | (805) 777 7975 | Electricians | Westlake Village · Ventura County | — | — |
| Westlake Glass INC | Thomas Kevin Mc Grath | — | (805) 495 1522 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| Westlan Construction | Mark Thomas Sausser | — | (310) 466 8627 | Electricians | Thousand Oaks · Ventura County | — | — |
| Westlan Construction M S INC | Mark Thomas Sausser | — | (310) 466 8628 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Westoaks Glass And Mirror INC | Robert Michael Gillmore | — | (818) 707 1075 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| Westside Remodeling | Jonathan Edward Wilcox | georgia@westsideremodeling.com | (805) 978 4912 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Westview Painting | Westview Painting | — | (805) 390 2792 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Wetzel Homes INC | Cody Alan Wetzel | — | (818) 437 7049 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Wetzel's Heating And Air Conditioning LLC | John Scott Wetzel | — | (805) 208 9964 | HVAC | Newbury Park · Ventura County | — | — |
| Wheatley Fence Company | Nathan Charles Wheatley | — | (805) 218 6585 | Other | Oak View · Ventura County | — | — |
| Whirlwide Pool Service LLC | Jordan Nicholas Perez | — | (805) 914 5161 | Pool | Thousand Oaks · Ventura County | — | — |
| Whitco Plumbing | Whitco Plumbing | — | (818) 590 1015 | Other | Thousand Oaks · Ventura County | — | — |
| Whitcomb Construction | Arthur Eugene Jr Whitcomb | — | (805) 797 7440 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Whitehawk Construction INC | Eglitis Dainis | — | (310) 864 0622 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Whitehead Electrical Systems INC | Russell Erle Whitehead | — | (805) 523 9109 | Electricians | Moorpark · Ventura County | — | — |
| Whiteswan's Superior Pool And Spa INC | Micah Giovanni Perfetto | — | (805) 981 8112 | Pool | Oxnard · Ventura County | — | — |
| Whitman Architectural Design INC | John Marcus Whitman | — | (805) 646 8485 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Whitney Plumbing DBA Advanced Plumbing | Jason Ronald Whitney | — | (805) 616 8824 | Other | Ventura · Ventura County | — | — |
| Whitson Construction Corporation | John William Whitson | — | (805) 581 6939 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Whittlesey Electric | Douglas Michael Whittlesey | — | (818) 648 5369 | Electricians | Simi Valley · Ventura County | — | — |
| Whrp Plumbing INC | Kyle William Edwa Gress | — | (805) 404 0715 | Other | Simi Valley · Ventura County | — | — |
| Whyte Wood Works | Whyte Wood Works | — | (805) 644 4397 | Other | Ventura · Ventura County | — | — |
| Wicked Wiring INC | Ross Alan Holloway | micah@micahrich.com | (805) 383 4070 | Electricians | Newbury Park · Ventura County | — | — |
| Wicks Roofing And Solar LLC - Ventura | Wicks Roofing And Solar LLC - Ventura | — | (805) 546-9056 | Other roofers | Ventura · Ventura County | — | — |
| Widders Painting | Widders Painting | — | (805) 708 6412 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Wilco Building Corporation | James Elden Jr Wilson | — | (805) 765 4188 | HVAC | Oxnard · Ventura County | — | — |
| Wildfire Warden INC | John Douglas Chabot | info@wildfirewarden.com | (805) 559 0071 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Wildwood Specialty Plumbing | Wildwood Specialty Plumbing | richard@wildwoodspecialtyplumbing.com | (805) 660 2838 | Other | Thousand Oaks · Ventura County | — | — |