| Cade Construction Services | Ronald Ian Cade | — | (714) 720 3404 | GC, remodel, ADU | Rancho Mission Viejo · Orange County | — | — |
| Caesar Alexander Stone Tile Co | Cesar Eduardo Hernandez | — | (949) 943 4252 | Other | Santa Ana · Orange County | — | — |
| Caesar's Appliance Service INC | Andrew R Cabello | — | (949) 616 4270 | HVAC | Laguna Niguel · Orange County | — | — |
| Cafe Concepts INC | Robert James Ii Walsh | — | (949) 273 8360 | Other | Rancho Santa Margarita · Orange County | — | — |
| Cafri Flooring INC | Valdovinos Joel Abarca | — | (714) 476 3207 | Other | Buena Park · Orange County | — | — |
| Cain Outdoor Construction | Kevin Michael Cain | — | (714) 757 7581 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Cairney & Sons Construction Corporation | James Lee Cairney | — | (714) 974 4418 | GC, remodel, ADU | Orange · Orange County | — | — |
| Cairney Construction Corporation | James Lee Cairney | — | (714) 390 4258 | GC, remodel, ADU | Orange · Orange County | — | — |
| Caisteal Builders INC | Bailey Ross Mc Cune | info@caistealbuilders.com | (714) 630 9922 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Caisteal Homes INC | Bailey Ross Mc Cune | — | (714) 630 9922 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Caivo's Plumbing | Caivo's Plumbing | — | (714) 290 5953 | Other | Tustin · Orange County | — | — |
| Cal - Best Construction Co INC | Justin Paul Peister | — | (714) 630 1180 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Cal - Pro Contractor's INC | Alyssa Marie Brooks | info@calprocontractors.com | (714) 602 4900 | Electricians | Irvine · Orange County | — | — |
| Cal - Tex Building & Design | Christopher Edward Guidry | — | (949) 795 8798 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Cal - West Fire Protection Specialist | Gonzalo Pena | — | (714) 497 7227 | Other | Santa Ana · Orange County | — | — |
| Cal / Pac Paintings & Coatings Acquisition INC | Nickolas Peter Markovich | — | (714) 628 1514 | Windows, patio, painters | Orange · Orange County | — | — |
| Cal Adu Builders INC | Damon Quoc Tran | — | (714) 418 1818 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Cal Art Turf-anil Bandaranaike | Cal Art Turf-anil Bandaranaike | — | (949) 563 1444 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Cal Bath & Kitchen | Daniel Guy Liechty | — | (949) 263 0779 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Cal Bath Renovations | Scott Barry Davis | — | (949) 263 0779 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Cal Building Systems INC | John Bryant Calvin | admin@calbuildingsystems.com | (714) 993 9650 | Electricians | Yorba Linda · Orange County | — | — |
| Cal Custom Interiors INC | Brieana Barrera | — | (562) 430 9200 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Cal Earth Contracting INC | Robin Poss Hartnett | — | (714) 447 3478 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Cal HVAC Services | Seyed Ali Hashemi | — | (949) 338 8698 | HVAC | Irvine · Orange County | — | — |
| Cal Landscaping & Maintenance | Carissa Anne Amesquita | — | (714) 376 9659 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Cal Native Construction INC | John Soonchul Song | — | (714) 393 9567 | GC, remodel, ADU | Brea · Orange County | — | — |
| Cal One INC | Alfonso Leon | — | (818) 267 4762 | Other | Anaheim · Orange County | — | — |
| Cal Pac Sheet Metal INC | Peggy Ann Carroll | — | (714) 979 2733 | Other | Santa Ana · Orange County | — | — |
| Cal Pacific Electric | Brett Ansel Johnson | calpacific@gmail.com | (714) 998 4881 | Electricians | Orange · Orange County | — | — |
| Cal Power & Lighting | Cal Power & Lighting | — | (949) 392 2711 | Electricians | San Juan Capistrano · Orange County | — | — |
| Cal Prestige Plumbing INC | Romero Pablo Martinez | — | (714) 862 6907 | Other | Garden Grove · Orange County | — | — |
| Cal Pride Plumbing LLC | Scott Tsuneaki Feeley | — | (949) 375 3457 | Other | Lake Forest · Orange County | — | — |
| Cal Pro Construction INC | Maximo Albert Telarroja | — | (949) 328 9590 | Other roofers | Laguna Hills · Orange County | — | — |
| Cal Pro Painting & Decor Corporation | Ramirez-hernandez Nabor | — | (714) 906 4175 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Cal Pro Plumbing INC | Francisco Estrada-Pulido | — | (714) 986 4084 | Other | Anaheim · Orange County | — | — |
| Cal Profe Electrical Co | David Zong-Min Chi | — | (626) 915 1268 | Electricians | Yorba Linda · Orange County | — | — |
| Cal Select Builders INC | Eldon Eugene Johnson | — | (714) 694 0203 | GC, remodel, ADU | Orange · Orange County | — | — |
| Cal South Engineering | Cal South Engineering | — | (949) 533 3639 | Other | Lake Forest · Orange County | — | — |
| Cal Sparkle Pool INC | John Alan Hughes | — | (949) 472 0166 | Pool | Orange · Orange County | — | — |
| Cal Spec Builders | Thomas Cole | — | (714) 901 5071 | GC, remodel, ADU | Seal Beach · Orange County | — | — |