| Cjb Contractors INC | Barney Joe Ledbetter | — | (714) 549 1232 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Cjr Builders INC | Richard Thomas Sr Bartle | — | (714) 572 2600 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Ck Construction | Jin Oh Kim | vathanak451@gmail.com | (323) 380 8758 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Ckc Construction Services INC | Christopher John Kretz | — | (714) 316 9465 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Claim Guard Restoration | Orozco Victor Luna | accounting@claim-guardrestoration.com | (949) 573 4074 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Clark Builders | Clark Builders | — | (949) 361 7763 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Clark C Severson | Clark C Severson | — | (562) 493 3611 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Clark Development Group INC | Thomas Clark Stevens | — | (714) 921 4100 | GC, remodel, ADU | Orange · Orange County | — | — |
| Clark Electric | Eric Noland Clark | — | (714) 660 2036 | Electricians | Anaheim · Orange County | — | — |
| Clark Pest Control | Clark Pest Control | — | (949) 220-2276 | Pest, tile roofs | Anaheim · Orange County | — | — |
| Clark Wimer DBA The Honest Energy Company | Clark Anthony Wimer | — | (949) 877 8855 | Electricians | Costa Mesa · Orange County | — | — |
| Clarke Masonry | Dennis John Clarke | — | (714) 793 1515 | Other | Huntington Beach · Orange County | — | — |
| Class Act Builders INC | Arthur Milton Iii Dickerson | artdickerson@classactbuilders.com | (714) 775 7244 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Class One Cleanrooms | Norma Jeanne Varni | jeremy@classonecleanrooms.com | (949) 589 9008 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| Classic Air Mechanical | Classic Air Mechanical | — | (714) 326 9311 | HVAC | Orange · Orange County | — | — |
| Classic Cabinet Refinishing | Scott Stewart Winer | — | (714) 307 9350 | GC, remodel, ADU | Orange · Orange County | — | — |
| Classic Concepts Painting Company | Michael Whitney Stanwood | — | (949) 689 7201 | Windows, patio, painters | Orange · Orange County | — | — |
| Classic Construction Services | Zachariah Taylor Curtis | — | (714) 356 6986 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Classic Design Home Improvement | Classic Design Home Improvement | support@webador.com | (310) 345 2766 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Classic Drywall Interiors | Classic Drywall Interiors | — | (714) 769 5205 | Other | Orange · Orange County | — | — |
| Classic Erecting | Classic Erecting | — | (714) 330 3853 | Other | Silverado · Orange County | — | — |
| Classic Home Improvement Products INC | Ryan Patrick Lorge | — | (866) 567 0400 | Other | Anaheim · Orange County | — | — |
| Classic Paving Services INC | Jeffery Robert Owens | — | (714) 527 5000 | Other | Los Alamitos · Orange County | — | — |
| Classic Refrigeration Socal INC | David Metcalf Rogers | — | (714) 264 3550 | HVAC | Brea · Orange County | — | — |
| Classic Restoration & Construction | Ajay Mody | — | (949) 951 3360 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Claunch Co | Brent Allen Claunch | solutions@claunch.com | (714) 815 8802 | Electricians | Brea · Orange County | — | — |
| Clavo | Jake W Winkle | — | (949) 873 3125 | Other | Costa Mesa · Orange County | — | — |
| Clay S Miller | Clay S Miller | — | (714) 920 0067 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Clayton Builders | Clayton Builders | — | (949) 433 7278 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Clayton Builders G C | Clayton Builders G C | — | (714) 743 2098 | GC, remodel, ADU | Anaheim Hills · Orange County | — | — |
| Clayton Decillo Construction | Clayton Michael De Cillo | — | (808) 971 1116 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Clayton E Lindsey Electrical | Clayton Eugene Lindsey | — | (714) 809 5431 | Electricians | Huntington Beach · Orange County | — | — |
| Clayton Roofing INC | Daren Lowell Clayton | — | (714) 639 7190 | Other roofers | Orange · Orange County | — | — |
| Clbld Corp | Elizabeth Annie Lee | — | (949) 749 8888 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Cle-air Water Purification INC | Vera Jane Kreider | cleairwaterpurification@gmail.com | (714) 870 4115 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Clean Energy | James Robert Wright | — | (949) 437 1000 | Other | Newport Beach · Orange County | — | — |
| Clean Finish Electrical | Brian Jonathan Maldini | cleanfinishelectrical@gmail.com | (949) 357 6448 | Electricians | Lake Forest · Orange County | — | — |
| Clean Glass Installation | Daniel Justin Kauffman | — | (818) 492 4265 | Windows, patio, painters | Orange · Orange County | — | — |
| Clean Out Plumbing And Rooter | Marco Antonio Jr Jover | — | (562) 328 9448 | Other | La Habra · Orange County | — | — |
| Clean Plumbing | Clean Plumbing | — | (714) 402 7079 | Other | Huntington Beach · Orange County | — | — |