| Carranza Construction | Kristian Daniel Carranza Saavedra | — | (714) 660 8524 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Carrera Concrete INC | Julian Ignacio Carrera | — | (949) 992 3200 | Other | Orange · Orange County | — | — |
| Carreto Construction | Juan Manuel Sr Carreto | — | (714) 715 8295 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Carri Construction | Carol Anna Carri | — | (714) 998 1101 | GC, remodel, ADU | Orange · Orange County | — | — |
| Carriedo Construction Services INC | Luis Maurilio Carriedo Carrillo | — | (714) 460 3951 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Carrieri Construction | Joseph Anthony Carrieri | — | (858) 776 6692 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Carroll Building Solutions INC | Joseph John Carroll | info@carrollbuildingsolutions.com | (909) 568 9284 | GC, remodel, ADU | Brea · Orange County | — | — |
| Carson Philip Schwalbe | Carson Philip Schwalbe | — | (949) 680 6854 | Other | Ladera Ranch · Orange County | — | — |
| Carson Roofing And Inspection | Michael David Carson | — | (714) 635 7663 | Other roofers | Fullerton · Orange County | — | — |
| Cartage | Nabil Mohamed Akremi Harbaoui | — | (714) 213 3310 | Other | Fullerton · Orange County | — | — |
| Carter Construction LLC DBA Jc Construction | Joseph Peter Carter | — | (714) 477 4009 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Carter Electric & Son INC | Scott Thomas Carter | — | (949) 422 3567 | Electricians | San Clemente · Orange County | — | — |
| Carter General Construction INC | Edward Earl Carter | — | (949) 254 4358 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Carter Industrial Automation INC | William Prentice Carter | — | (562) 596 9988 | Electricians | Los Alamitos · Orange County | — | — |
| Carter Security Systems | Carter Security Systems | — | (801) 520 7117 | Alarm and generators | Westminster · Orange County | — | — |
| Carver Young Woodworking | Carver Donald Young | — | (949) 700 4119 | Other | Costa Mesa · Orange County | — | — |
| Carvertree INC | Markus Edward Carver | — | (714) 545 5300 | Other | Newport Beach · Orange County | — | — |
| Cas Communications INC | Carl Anthony Staine | — | (562) 805 6678 | Other | Fullerton · Orange County | — | — |
| Casa Building Corp | Clayton John Fisher | interested@domainmarket.com | (760) 969 0153 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Casa Painting | Garcia Salvador Angulo | — | (949) 646 8401 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Casa Revival Construction INC | James Dean Hall | — | (714) 864 1632 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Casabian Construction LLC | Charles Eric Brown | charlie@casabianconstruction.com | (503) 434 0426 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Casanova Renovation | Monica Christine Yoquigua | — | (877) 220 5890 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Casaria Technology INC | Peter Horrack | — | (949) 350 0214 | Electricians | San Clemente · Orange County | — | — |
| Casco Contractors LLC | Cheryl Ann Osborn | — | (949) 679 6880 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Case | Todd William Bertels | — | (714) 849 5342 | Electricians | Huntington Beach · Orange County | — | — |
| Case & Sons Construction INC | Marcia Kaye Case | — | (714) 993 2206 | Electricians | Yorba Linda · Orange County | — | — |
| Case Development Company INC | Robert Richard Case | — | (714) 996 9960 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Casey Vitek | Casey Vitek | — | (310) 654 2090 | Other | Cypress · Orange County | — | — |
| Casillas Pool And Spa INC | Rafael Casillas | — | (562) 843 4517 | Pool | La Habra · Orange County | — | — |
| Casper Construction | Casper Andrew | — | (714) 353 9927 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Casper's Builders | Casper Alexander Pena | — | (714) 909 7145 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Caspers Demolition | Caspers Demolition | — | (714) 863 5474 | Other | Anaheim · Orange County | — | — |
| Caspian Air | Caspian Air | — | (949) 344 6467 | HVAC | Irvine · Orange County | — | — |
| Caspian Windows And Glass Doors | Caspian Windows And Glass Doors | — | (949) 410 9333 | Windows, patio, painters | Irvine · Orange County | — | — |
| Cassara Masonry INC | Nicholas Michael Cassara | — | (714) 904 5787 | Other | Huntington Beach · Orange County | — | — |
| Cassel Electric | Robert Lawrence Cassel | — | (714) 292 7306 | Electricians | Santa Ana · Orange County | — | — |
| Cassidy's Construction Company | Cassidy Ward Summers | — | (714) 276 5158 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Cast Coast Construction | Valencia Alonso Benito | — | (714) 390 7709 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Cast Holder Construction | Cast Al Holder | castholderconstruction@gmail.com | (949) 235 7424 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |