| Oscar R Rodriguez | Oscar R Rodriguez | — | (805) 358 7880 | Other | Thousand Oaks · Ventura County | — | — |
| Oscar Sosa | Oscar Sosa | — | (805) 657 0286 | Other | Simi Valley · Ventura County | — | — |
| Oscar Zavala | Oscar Zavala | — | (805) 205 5082 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Oshan Trees INC | Gat Daniel | contact@oshantrees.com | (805) 320 7639 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Ost Trucks And Cranes INC | Leon Dennis Zermeno | — | (805) 643 9963 | Other | Ventura · Ventura County | — | — |
| Ota Landscaping | Ota Landscaping | — | (805) 358 9765 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Outdoor Creations | Outdoor Creations | — | (805) 208 1663 | Windows, patio, painters | Newbury Park · Ventura County | — | — |
| Outlaw Landscaping | Robert Patrick Devlin | — | (805) 645 0610 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Ov Tree Co LLC | Forrest Langlo Crane | — | (805) 705 7016 | Other | Ojai · Ventura County | — | — |
| Overall Engineering | Sagrero Ovidio Sanchez | — | (805) 231 0727 | Other | Oxnard · Ventura County | — | — |
| Overhead Door Co Of Ventura County | Evan William Watson | — | (805) 746 0780 | Other | Ventura · Ventura County | — | — |
| Overland Interiors Drywall Solutions | Overland Interiors Drywall Solutions | — | (805) 304 7296 | Other | Simi Valley · Ventura County | — | — |
| Oxnard Fire Protection INC | Martinez James | — | (805) 432 0434 | Other | Oxnard · Ventura County | — | — |
| Oxnard Glass Company | Bryon Craig Linville | — | (805) 495 0441 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| Oxton Building Co | Matthew Sean Curran Oxton | — | (805) 415 1444 | GC, remodel, ADU | Somis · Ventura County | — | — |
| Oz Construction | Oz Jacob | info@ozconstruction.com | (805) 490 7851 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| P & I Landscape INC | Irma Garcia Lomeli | — | (805) 524 2391 | Windows, patio, painters | Fillmore · Ventura County | — | — |
| P & L Plumbing INC | Peter Robert Iii Kivlen | — | (805) 432 1588 | Other | Simi Valley · Ventura County | — | — |
| P & Z Landscape | P & Z Landscape | — | (805) 236 2973 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| P B Electric | Bartos Peter | — | (805) 506 3955 | Electricians | Westlake Village · Ventura County | — | — |
| P C H Construction INC | Brian Jon Blythe | — | (310) 699 9761 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| P D B Construction | Peter Dale Barton | — | (805) 798 0692 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| P G & G Construction INC | Patrick Alan Glispey | — | (805) 258 3211 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| P R Cabinetry And Millwork | P R Cabinetry And Millwork | — | (805) 814 0392 | Other | Ventura · Ventura County | — | — |
| P S I | P S I | — | (818) 618 2333 | Other | Thousand Oaks · Ventura County | — | — |
| P S R Environmental Service INC | Paul Benito Robles | — | (805) 988 8284 | Other | Oxnard · Ventura County | — | — |
| P V & Associates INC DBA Servpro Of Camarillo/oxnard | Michael Ryan Nunes | — | (815) 484 5009 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| P W B Vulcan INC DBA Phoenix General Contracting | Philip Michael Reynolds | — | (805) 804 2636 | HVAC | Simi Valley · Ventura County | — | — |
| P W L Group INC | Julia Marie Weiss | — | (805) 404 3314 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| P9 Construction Company | Kyle Matthew Parkinson | info@p9construction.com | (805) 915 4731 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Pablo's Plumbing | Pablo's Plumbing | — | (805) 341 7804 | Other | Simi Valley · Ventura County | — | — |
| Pablo's Tree Service INC | Jose Pablo Alvarez | — | (805) 587 7653 | Tree | Simi Valley · Ventura County | — | — |
| Pacheco Painting | Pacheco Painting | impallari@gmail.com | (805) 990 0621 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| Pacheco's Custom Woodwork | Pacheco's Custom Woodwork | — | (805) 889 8574 | Other | Oxnard · Ventura County | — | — |
| Pacific Air Ventura | Pacific Air Ventura | — | (470) 548-2855 | HVAC | Ventura · Ventura County | — | — |
| Pacific Aire LLC | Irma Cosio Molesworth | — | (805) 427 7987 | HVAC | Oxnard · Ventura County | — | — |
| Pacific Blue Pools & Spas | Pacific Blue Pools & Spas | — | (805) 732 4793 | Pool | Moorpark · Ventura County | — | — |
| Pacific Builders | Pacific Builders | — | (916) 383-3168 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Pacific Coast Asphalt | Pacific Coast Asphalt | — | (805) 649 2512 | Other | Oak View · Ventura County | — | — |
| Pacific Coast Builder | Pacific Coast Builder | — | (805) 485 2005 | GC, remodel, ADU | Oxnard · Ventura County | — | — |