| Commercial West General Contractors | Lyle Dwayne Mckenzie | — | (805) 275 6178 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Communications West | Communications West | — | (310) 393 2442 | Other | Newbury Park · Ventura County | — | — |
| Community Action Of Ventura County INC | Fanni Azueta | — | (805) 436 4011 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Community Glass & Mirror Corp | Daniel Lewis| Burlingham Dan Burlingham | — | (805) 526 1067 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Compere Construction | Peter Frederick Compere | — | (805) 318 5181 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Complete Connection Cabling Services INC | Nicholas Andrew Marshall | — | (805) 876 2227 | Other | Port Hueneme · Ventura County | — | — |
| Complete Screens | Complete Screens | info@completescreens.com | (818) 470 1444 | Other | Thousand Oaks · Ventura County | — | — |
| Composite INC | Chongsup Lee | support@composite.com | (310) 595 1280 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Comtech Construction | William Richard Jr Culp | — | (818) 723 6430 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Comtronics | John Thomas Hritz | help@comtronics.com | (818) 994 9007 | Other | Simi Valley · Ventura County | — | — |
| Con - Sol Enterprises | Craig Eugene Brown | — | (805) 648 3486 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| Concept Builders | Concept Builders | — | (530) 713 4129 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Concrete Artistry INC | Gilbert Perez | — | (805) 947 9603 | Other | Oxnard · Ventura County | — | — |
| Concrete Epoxy Injection Services | Thomas David Donovan | — | (805) 404 6807 | Other | Simi Valley · Ventura County | — | — |
| Concrete Solutions | Concrete Solutions | — | (805) 732 8494 | Other | Thousand Oaks · Ventura County | — | — |
| Condor Drywall | Condor Drywall | — | (805) 479 8697 | Other | Oxnard · Ventura County | — | — |
| Conejo Bros Plumbing | Teresa Maria Santos | info@conejobrosplumbing.com | (805) 603 1983 | Other | Thousand Oaks · Ventura County | — | — |
| Conejo Complete Landscape LLC | Kevin Michael Lydick | — | (805) 630 8377 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Conejo Concrete Pumping Service | Eric James Bradle | — | (805) 498 5936 | Other | Newbury Park · Ventura County | — | — |
| Conejo Hardwoods INC | Roth Skylar Johnson | — | (818) 889 0487 | Other | Westlake Village · Ventura County | — | — |
| Conejo HVAC Plumb Electric Roofs Pool Maint Garage Door | Ralph Ortiz | — | (805) 499 0448 | Other roofers | Newbury Park · Ventura County | — | — |
| Conejo Oaks Roofing | Kenneth James Henson | — | (805) 368 2957 | Other roofers | Thousand Oaks · Ventura County | — | — |
| Conejo Plumbing Solutions | Conejo Plumbing Solutions | — | (805) 796 5093 | Other | Camarillo · Ventura County | — | — |
| Conejo Restoration | Scott Lee Mineo | admin@conejorestoration.com | (805) 338 6653 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Conejo Services HVAC Plumbing And Electrical | Conejo Services HVAC Plumbing And Electrical | — | (805) 232-4988 | HVAC | Newbury Park · Ventura County | — | — |
| Conejo Tankless Water Heaters & Plumbing INC | Madigan Roy | — | (805) 492 7685 | Other | Thousand Oaks · Ventura County | — | — |
| Conejo Technical Services INC | Joseph Edward Kielas | — | (877) 266 3569 | Other | Newbury Park · Ventura County | — | — |
| Conejo Valley Concrete | Conejo Valley Concrete | info@conejovalleyconcrete.com | (424) 422 5547 | Other | Thousand Oaks · Ventura County | — | — |
| Conejo Valley Construction INC | Forrest Lee Gregge | office@conejovalleyconstruction.com | (805) 490 4040 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Conejo Valley Contracting LLC | Francesco Amodei Fichera | — | (818) 319 0532 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Conejo Valley Fencing INC | Karen Andreasyan | info@conejovalleyfencing.com | (805) 375 6222 | Other | Newbury Park · Ventura County | — | — |
| Conejo Valley Glass | Conejo Valley Glass | — | (805) 885 8630 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Conejo Valley Overhead Door | Conejo Valley Overhead Door | conejovalleyoverheaddoor@gmail.com | (805) 427 0158 | Other | Somis · Ventura County | — | — |
| Conejo Valley Plumbing | Conejo Valley Plumbing | — | (805) 732 3138 | Other | Thousand Oaks · Ventura County | — | — |
| Conejo Valley Roofing | Spencer Charles Fosnaugh | — | (805) 558 1420 | Other roofers | Newbury Park · Ventura County | — | — |
| Conejo Valley Signs | Conejo Valley Signs | info@sigsigns.com | (805) 987 8380 | Other | Camarillo · Ventura County | — | — |
| Conejo Valley Tree Service | Echtekleff Alexander | — | (805) 241 0404 | Tree | Thousand Oaks · Ventura County | — | — |
| Conejo Woodworks | Daniel Robert Schuyler | — | (805) 768 4604 | Other | Newbury Park · Ventura County | — | — |
| Conner Custom Creations | Conner Custom Creations | — | (805) 660 6486 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Connor Everett Christ | Connor Everett Christ | — | (661) 964 7453 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |