| Conquest Gbc Inc. | James Michael Korkunis | conquestgbc@mac.com | (805) 520 7803 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Consolidated Concrete Inc. | Gary Branson Hand | — | (805) 433 4802 | Other | Simi Valley · Ventura County | — | — |
| Constel Enterprises LLC DBA Ceildex Suspended Stretched Ceilings | Valeriia Afanasieva | — | (818) 223 7932 | Other | Simi Valley · Ventura County | — | — |
| Constructech INC | Patrick Alan Shaffer | — | (805) 527 1281 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Construction & Asset Management INC | Carlos Omar Lopez | — | (805) 857 5908 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Construction Babylon INC | Golpachin Michael Eshoo | michael@constructionbabylon.com | (805) 300 9109 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Construction By De Mill INC | Gerald Richard De Mill | — | (818) 535 7100 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Construction Unlimited Builders INC | Michael Anthony Petroccione | — | (805) 558 2284 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Construmex INC | Mario Alberto Lopez | — | (805) 857 9121 | GC, remodel, ADU | Fillmore · Ventura County | — | — |
| Contemporary Electrical Design INC | Brett Tyler Johnson | — | (805) 380 5247 | Electricians | Thousand Oaks · Ventura County | — | — |
| Contractor's Choice | Brian William Hudnell | — | (805) 988 1993 | Other | Camarillo · Ventura County | — | — |
| Contractors Land | Jose Munguia | — | (747) 242 0362 | Other roofers | Westlake Village · Ventura County | — | — |
| Control Point | Dana Lee Benson | contact@controlpoint.com | (818) 405 0289 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Controlled Elements Corp | Virgil Jeffrey Donaldson | — | (805) 628 3144 | HVAC | Ventura · Ventura County | — | — |
| Coogan Developments | Cameron Michael Coogan | — | (805) 806 8845 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Cook Development Company | Terry Jack Cook | info@cook-development.com | (805) 857 0962 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Cooksey Construction | Edward Jay Cooksey | — | (805) 320 6042 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Cool Dreams Heating And Air | Cool Dreams Heating And Air | — | (805) 328 9512 | HVAC | Simi Valley · Ventura County | — | — |
| Cool Hero Heating & Air LLC | Richard James Gibson | — | (559) 471 6933 | HVAC | Camarillo · Ventura County | — | — |
| Cool West Air Conditioning And Heating | Michael Allen Schirber | — | (805) 644 3101 | HVAC | Ventura · Ventura County | — | — |
| Coolwater Plumbing | Coolwater Plumbing | — | (818) 735 3580 | Other | Westlake Village · Ventura County | — | — |
| Cooper Electric | Daniel Jon Cooper | — | (805) 797 4207 | Electricians | Ventura · Ventura County | — | — |
| Copper Shine Plumbing | Copper Shine Plumbing | info@coppershineplumbing.com | (805) 914 9588 | Other | Simi Valley · Ventura County | — | — |
| Cor Builders | Rafael Ochoa Cortez | — | (805) 794 3986 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| Cor Plumbing | Cor Plumbing | service@corplumbing.com | (805) 947 8391 | Other | Santa Paula · Ventura County | — | — |
| Core Fiber Optics INC | John Nabil Labib | jlabib@corefiberoptics.com | (818) 535 9259 | Other | Westlake Village · Ventura County | — | — |
| Coretemp Mechanical Systems | Saul Mendoza | — | (805) 205 0319 | HVAC | Moorpark · Ventura County | — | — |
| Cornell Construction INC | William Eric Cornell | — | (805) 300 4803 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Cornerstone Construction | Martinez Bedolla Christopher | gwebb@cornerstone-construction.com | (832) 259-2520 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Cornerstone Construction Services INC | Mario Pena Cetto | — | (562) 642 4184 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Cornerstone Plumbing INC | Zecua Margarito Munoz | — | (805) 815 2648 | Other | Oxnard · Ventura County | — | — |
| Corona Landscape & Decorative Borders | Corona Landscape & Decorative Borders | — | (805) 983 7711 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Corona's Tree Service INC | Garcia-corona Jorge | — | (805) 340 6899 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Coronado Painting | Coronado Painting | — | (805) 775 7367 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Corral Construction | Anthony Jr Corral | info@corral-construction.com | (805) 794 4437 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Corse Electric | Andrew Joseph Corse | corseelectric94@gmail.com | (805) 901 0218 | Electricians | Ventura · Ventura County | — | — |
| Corson Roofing INC | Richard William Corson | — | (818) 718 8406 | Other roofers | Simi Valley · Ventura County | — | — |
| Cortez-link LLC | Victor Manuel Carrillo | — | (805) 342 3452 | Electricians | Oxnard · Ventura County | — | — |
| Cory Mallam Construction | Cory Anthony Mallam | — | (805) 499 4646 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Cory Risvold Painting | Cory Risvold Painting | — | (805) 377 9675 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |