| C P Mc Clary Construction INC | Christopher Paul Mc Clary | — | (714) 271 1055 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C R Coatings INC | Carlos Enrique Merino | — | (562) 902 2261 | Windows, patio, painters | La Habra · Orange County | — | — |
| C R Coatings Painting INC | Ricardo Martinez | — | (714) 791 4995 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| C R H | C R H | — | (714) 478 8151 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| C R M Co | Carlos Roberto Morales | — | (562) 712 1264 | GC, remodel, ADU | La Habra · Orange County | — | — |
| C R M Construction | Clay Randall Morgan | — | (951) 235 4182 | GC, remodel, ADU | La Habra · Orange County | — | — |
| C R Rodgers Electric | Christopher John Rodgers | crelectric69@yahoo.com | (562) 208 7453 | Electricians | Huntington Beach · Orange County | — | — |
| C R S Construction | Joseph Theo Chadarevian | — | (714) 707 9914 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| C R Shelton Construction INC | Charles Reed Shelton | — | (714) 315 1045 | GC, remodel, ADU | Anaheim Hills · Orange County | — | — |
| C R Young & Sons INC | Zoe Nichole Young | — | (714) 774 3044 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| C S B Quality Floors | C S B Quality Floors | — | (714) 800 3714 | Other | Santa Ana · Orange County | — | — |
| C S I Builders | C S I Builders | — | (949) 842 6773 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| C S I Construction Co | Timothy James Phelan | — | (949) 380 3900 | Electricians | Foothill Ranch · Orange County | — | — |
| C S I INC | Michael Michio Okuma | — | (949) 857 1001 | GC, remodel, ADU | Tustin · Orange County | — | — |
| C S M Waterworks INC | James Lawrence Gardener | — | (213) 748 7321 | Other | San Clemente · Orange County | — | — |
| C S T Construction | Juan Carlos Castillo | — | (949) 278 5001 | GC, remodel, ADU | Orange · Orange County | — | — |
| C Saw Electric INC | Clement Cang Saw | — | (714) 484 2735 | Electricians | Cypress · Orange County | — | — |
| C Scape INC | Roberto Cortez-Udave | — | (714) 448 7056 | Windows, patio, painters | Anaheim · Orange County | — | — |
| C Solutions INC | James Douglas Mott | — | (415) 279 7873 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| C T Design | C T Design | — | (949) 449 4188 | Other | San Juan Capistrano · Orange County | — | — |
| C T Electric Co | David Alexander Holmes | — | (714) 997 5822 | Electricians | Orange · Orange County | — | — |
| C T General And Painting Co | Edwin Jitae Kim | — | (714) 833 9490 | GC, remodel, ADU | La Palma · Orange County | — | — |
| C T I Construction | Alireza Ashabi | — | (949) 584 8966 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| C T M INC | Christine Troy Martin | — | (949) 574 4895 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C T Plumbing | C T Plumbing | — | (714) 420 2360 | Other | Anaheim · Orange County | — | — |
| C T T Heating And Air Conditioning | Chris Trunghai Tran | — | (714) 605 3996 | HVAC | Anaheim · Orange County | — | — |
| C W C Builders | C W C Builders | — | (714) 717 3789 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C W Engdahl General Contractor | C W Engdahl General Contractor | — | (949) 933 7371 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| C W Heating And Air Conditioning | Charles Walter Wells | — | (714) 514 3869 | HVAC | Anaheim · Orange County | — | — |
| C W S Pool Services | Craig Allen Winberg | — | (714) 231 3644 | Pool | Fullerton · Orange County | — | — |
| C W Schatz | C W Schatz | — | (714) 612 6859 | GC, remodel, ADU | Brea · Orange County | — | — |
| C W Slurry Seal INC | Chad Jeffrey Wheeler | — | (949) 482 1547 | Other | Newport Beach · Orange County | — | — |
| C Ware Construction INC | Stuart Conley Ware | — | (949) 495 6834 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| C Y D Works Electric | Andrew Yongki Kim | info@cydworkselectric.com | (714) 902 1047 | Electricians | Garden Grove · Orange County | — | — |
| C&a Tree Care Services INC | Adalberto Ramirez Cruz | — | (714) 994 9663 | Tree | Buena Park · Orange County | — | — |
| C&c Bro Landscaping | Jose Luis Cervantes Huerta | — | (714) 400 5025 | Windows, patio, painters | Orange · Orange County | — | — |
| C&c Power Company INC | Michael Taggart Watkins | — | (714) 225 2985 | Electricians | Huntington Beach · Orange County | — | — |
| C&k Electrical & Plumbing INC | Christopher Shawn Kirchwehm | — | (619) 252 5290 | Electricians | Fountain Valley · Orange County | — | — |
| C&m Contracting INC | Christopher James Koppi | — | (714) 394 7117 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| C&n Development INC | Calvin Chang | — | (626) 715 5503 | GC, remodel, ADU | Brea · Orange County | — | — |