| C F P Fire Protection INC | Ronald Thomas Harvey | — | (949) 727 3277 | Electricians | Irvine · Orange County | — | — |
| C G Construction & Consulting Serv | Gaboras Cornel | — | (714) 264 5870 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| C G Door And Frame | C G Door And Frame | — | (714) 654 7786 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| C G Landscape INC | Jeffrey Blythe Miller | — | (714) 535 5640 | Windows, patio, painters | Anaheim · Orange County | — | — |
| C G Patio Rooms & Covers INC | Christopher Gerard Gragnano | — | (714) 742 9255 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| C H A Properties INC DBA C H Anderson Construction | Craig Hales Anderson | — | (949) 606 4142 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| C H L Iii Construction Co | Charles Henry Iii Lampe | — | (949) 496 3170 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| C H M Construction INC | Carl Howard May | — | (951) 471 4991 | GC, remodel, ADU | Orange · Orange County | — | — |
| C H Stair Company | Craig Hayward Hubbard | — | (714) 624 5280 | Other | Fullerton · Orange County | — | — |
| C I Construction | Coroama Ionel | — | (714) 260 7541 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| C I Landscaping INC | Martinez Constantino Rita | — | (714) 507 9779 | Windows, patio, painters | Orange · Orange County | — | — |
| C I M Enterprises INC | Ismael Santiago Jr Mayans | — | (714) 692 1900 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| C I Oriental Painting INC | Christine Hyunmi Im | — | (310) 617 5566 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| C J D Demolition | Christopher Munoz | — | (714) 873 0674 | Other | Orange · Orange County | — | — |
| C J Electric | Christian Bogdan Micu | — | (714) 458 2619 | Electricians | Fullerton · Orange County | — | — |
| C J M General Electrical Company | Christopher John Mouser | — | (714) 620 6351 | Electricians | Santa Ana · Orange County | — | — |
| C J Plumbing | C J Plumbing | — | (949) 929 5517 | Other | Irvine · Orange County | — | — |
| C J U Construction | Chad James Urbanski | — | (619) 988 3235 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| C J W / M Z T A Joint Venture | Company Macro-Z-Technology | — | (714) 835 6820 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| C J W Construction INC | Daniel Ordaz Duarte | — | (714) 835 6820 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| C J W Joint Venture | Company Macro-Z-Technology | — | (714) 835 6820 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| C J Works INC | Yu-Chien Liao | — | (949) 280 3209 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| C Jones & Company | Christopher James Jones | — | (714) 668 1190 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C K Allen | C K Allen | — | (949) 548 7144 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C K C | C K C | — | (714) 316 9465 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| C K Construction | Corrie Dean Kates | — | (714) 434 9228 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| C K Electric | Clyde Kent Farmer | — | (949) 637 5434 | Electricians | Mission Viejo · Orange County | — | — |
| C K Pool Service | Craig Thomas Keating | — | (714) 309 2591 | Pool | Costa Mesa · Orange County | — | — |
| C L M Construction | Charles Lyle Mauvezin | enquiries@clmconstruction.com | (949) 212 0112 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| C L Taylor Construction INC | Cary Lee Taylor | — | (714) 323 1067 | GC, remodel, ADU | Westminster · Orange County | — | — |
| C M B Construction & Development | Charles Michael Brunell | — | (949) 254 6436 | GC, remodel, ADU | Ladera Ranch · Orange County | — | — |
| C M Construction | Christopher Patrick Murray | — | (562) 889 7151 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| C M Dailey Electric | Curt Mathew Dailey | — | (714) 397 2256 | Electricians | Huntington Beach · Orange County | — | — |
| C M M Engineering & Construction INC | Mitre Marcos | — | (858) 692 7896 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| C M Strucco INC | Stephen Victor Caulkins | — | (949) 498 7636 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| C M T Home Improvement | C M T Home Improvement | — | (949) 525 7297 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| C N H Construction | Hector Manuel Cervantes | — | (949) 304 3057 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| C N Mechanical | C N Mechanical | — | (714) 920 9647 | HVAC | Santa Ana · Orange County | — | — |
| C Nakamura | C Nakamura | — | (714) 522 4326 | Electricians | Rancho Santa Margarita · Orange County | — | — |
| C P Construction | Chuong Gia Pham | — | (714) 227 7090 | GC, remodel, ADU | Garden Grove · Orange County | — | — |