| Ulta Maintenance INC | Roman Lopez | — | (310) 210 2592 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Ultimate Finish INC | Humberto Reyes | — | (805) 404 0841 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Ultimate Painters | Ultimate Painters | — | (805) 579 8913 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Ulysses Vera | Ulysses Vera | — | (805) 415 4073 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Under Cover Patios INC | Aidan Seamus Austin | — | (805) 258 8330 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Underground Solutions LLC DBA Underground Communications | Javier Junior Esqueda | — | (818) 983 8416 | Other | Simi Valley · Ventura County | — | — |
| Uni - Design Construction INC | Ruben Jr Chavez | — | (805) 479 8269 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Unified Construction Services | Jesus Manuel Zamora | — | (805) 607 3329 | Other | Oxnard · Ventura County | — | — |
| Unified Plumbing INC | Reyes Misahel | — | (805) 830 9191 | Other | Ventura · Ventura County | — | — |
| Union Engineering Company INC | Rebecca Sue Elkins | — | (805) 644 3373 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Union Excavating INC | Robert Angus Fletcher | — | (805) 522 5043 | Other | Simi Valley · Ventura County | — | — |
| Unique Floor Covering & Removal INC | Guillermo Martinez | — | (805) 558 1558 | Other | Fillmore · Ventura County | — | — |
| Unique Kitchen And Bath Renovation | Unique Kitchen And Bath Renovation | — | (805) 421 3165 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Unique Woodworks | Unique Woodworks | — | (805) 551 7166 | Other | Santa Paula · Ventura County | — | — |
| United Construction | Flores Garcia Adolfo | akneisel@unitedconstruction.com | (805) 815 5054 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| United Construction And Design Company | Mark Christopher Boemmels | — | (805) 405 9672 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| United Electric | Jonathan William Jones | — | (805) 650 8658 | Electricians | Camarillo · Ventura County | — | — |
| United Mechanical Contractors | Jeremy Nicholas Yablan | — | (805) 558 4213 | HVAC | Simi Valley · Ventura County | — | — |
| United Plumbing Masters INC | Angel Danny Ruiz | unitedplumbingmasters@gmail.com | (805) 797 9899 | Other | Port Hueneme · Ventura County | — | — |
| United Remodeling Ca INC | Ron Schwartz | — | (805) 232 5817 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| United Window Tinting | United Window Tinting | — | (805) 244 6571 | Other | Thousand Oaks · Ventura County | — | — |
| Uniteds Landscaping Service | Yubany Alarcon | — | (805) 202 6947 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Universal Attic INC | Michael Jon Priebe | — | (661) 609 7000 | Other | Fillmore · Ventura County | — | — |
| Universal Landscapes Services | Juan Alfredo Hernandez | — | (805) 793 6125 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Unlimited Climate Control INC | Tomas Kelvin Membrila | — | (323) 273 4850 | HVAC | Simi Valley · Ventura County | — | — |
| Unlimited Engineering Contracting INC | Kevin Carter | — | (805) 587 7514 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Uppacott Legacy Design Build Manage INC | Chris Robert Barth | — | (805) 428 1399 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Urban Construction Enterprises | Lorenzo Ambriz Jimenez | — | (805) 469 4868 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Urban Gates | Matt A Roberts | astigma@astigmatic.com | (805) 221 3212 | Other | Camarillo · Ventura County | — | — |
| Urban Greening | Noreen Noriko Murano-Cabanting | — | (805) 535 4448 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Urban Paints INC | Rodriguez Anguiano Yovani | — | (818) 403 8288 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Uriel's Painting | Uriel's Painting | — | (805) 796 9175 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Urzua's Landscape | Urzua's Landscape | — | (805) 366 7492 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Us Garage Doors & Gates Group LLC | Amir Razi | — | (310) 432 3138 | Other | Thousand Oaks · Ventura County | — | — |
| Us Industrial General Engineering | Us Industrial General Engineering | — | (805) 248 1017 | Other | Ventura · Ventura County | — | — |
| Uso Roofing INC | Antonio Iii Espino | — | (805) 420 8574 | Other roofers | Ventura · Ventura County | — | — |
| Utopia Management | Utopia Management | ventura@utopiamanagement.com | — | Property managers | Ventura · Ventura County | — | — |
| Utopia Property Management | Ventura Ca | Utopia Property Management | Ventura Ca | ventura@utopiamanagement.com | (805) 395-9999 | Property managers | Ventura · Ventura County | — | — |
| V & V Landscaping INC | Francisco Rosario Higuera Higuera | — | (805) 275 6426 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| V C Turf | V C Turf | — | (833) 282 8873 | Other | Ventura · Ventura County | — | — |