| Connor Loftus | Connor Loftus | — | (714) 507 5650 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Connor's Landscape | Michael Mcinally Loftus | — | (714) 865 2611 | Windows, patio, painters | Orange · Orange County | — | — |
| Conqst Building INC | Thomas Brian Fee | — | (949) 689 6359 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Conquest Air INC | Aaron Anthony Caban | — | (714) 412 9591 | HVAC | Anaheim · Orange County | — | — |
| Conrad Construction INC | David Anthony Sepulveda | — | (714) 457 8046 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Conscious Environments INC | Joshua Scott Duncan | — | (714) 882 4750 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Consolidated Contracting Services INC | Joseph Manuel Troya | — | (949) 498 7500 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Constantine Network Services | Constantine Illarion Sturza | — | (619) 300 2754 | Other | Newport Beach · Orange County | — | — |
| Constantino Aguirre | Constantino Aguirre | — | (949) 573 7340 | Windows, patio, painters | Dana Point · Orange County | — | — |
| Consterior Construction | Jang Wonhee | — | (949) 540 3939 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Construct 1 One Corp | Lauren Lynn Hundley | — | (714) 259 5400 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Construct United LLC | Kole Alexander Carr | — | (714) 833 8432 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Constructamerica | Matthew Kelly Crockett | — | (714) 738 7144 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Construction | Christopher Adrian Garcia | — | (619) 244 9655 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Construction 4 Less | Shalom Guli | — | (818) 987 5817 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Construction And Electric Jesus INC | Fermin| Jaimes Fermin Jaimes-garcia | — | (949) 371 1412 | Electricians | Lake Forest · Orange County | — | — |
| Construction Clean Up | Elizor Daboush | — | (562) 290 9393 | Other | Costa Mesa · Orange County | — | — |
| Construction Concepts INC | Mark Andrew Jepsen | info@constructionconcepts.com | (951) 239 7571 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Construction Concepts Unlimited | John Manuel Arredondo | — | (714) 401 1246 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Construction Development Management INC | Andrade Noe | — | (714) 966 2015 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Construction Group Of America Corp | Shen James | — | (949) 701 7778 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Construction Industry Associates INC | Marwan Khader Alrifai | — | (714) 878 5337 | Other | Fountain Valley · Orange County | — | — |
| Construction Management And Consulting Cm&c | Frank Eugene Blefari | — | (949) 357 3561 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Construction Planning & Management | Amir Mohammadali Birjandi | — | (949) 378 3007 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| Construction Quest | Dishoian Vartan | — | (714) 292 4648 | GC, remodel, ADU | Orange · Orange County | — | — |
| Construction Repair | Wallace Charles Pankratz | — | (714) 974 2228 | GC, remodel, ADU | Orange · Orange County | — | — |
| Construction Service West | Jacob James Herold | — | (714) 788 6642 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Construction Services Unlimited INC | Brian David Robertson | — | (714) 767 3269 | GC, remodel, ADU | Foothill Ranch · Orange County | — | — |
| Construction Solution Service INC | Anthony Dominic Cantelmo | — | (714) 323 7604 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Construction Solutions | Sepes Jan | — | (714) 493 9611 | GC, remodel, ADU | Orange · Orange County | — | — |
| Construction Solutions & Remodeling | Marvin Anibal Alvarado | — | (714) 420 6482 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Construction Solutions Usa LLC | Jan Sepes | — | (714) 493 9611 | GC, remodel, ADU | Orange · Orange County | — | — |
| Construction Tech | Ronald Eugene Sortor | — | (909) 816 1587 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Construction Works | Fred Joseph Reichert | — | (949) 290 6462 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Constructionx | William Thor Martinsen | — | (772) 485 4821 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Consulting Technology Network INC | Rony Alexander Rivera | — | (714) 863 1129 | Electricians | Anaheim · Orange County | — | — |
| Consumer Services Roofing | Luis Humberto Cardenas | — | (714) 734 6917 | Other roofers | Tustin · Orange County | — | — |
| Contact Electric | Ludusan Benny | — | (714) 341 1578 | Electricians | Anaheim · Orange County | — | — |
| Contech Construction INC | Yeo Jin Yoon | — | (714) 462 7734 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Contech Services INC | Michael Ian Snow | — | (714) 557 6425 | GC, remodel, ADU | Santa Ana · Orange County | — | — |