| Clean Rooms West LLC | Timothy J Sr Allison | — | (714) 258 7700 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Clean Slate | Ricardo Alvarez | — | (714) 215 4158 | Other | Anaheim · Orange County | — | — |
| Clean Usa Water Plumbing INC | Carlos Fernando Alveal Borquez | — | (800) 887 4179 | Other | Stanton · Orange County | — | — |
| Clean-out Kings | Clean-out Kings | — | (866) 265 4647 | Other | Anaheim · Orange County | — | — |
| Cleanforce Concrete Corp | Salvador Bautista | — | (213) 379 3557 | Other | Anaheim · Orange County | — | — |
| Clear Blue Environmental | Michael Thomas Conching | — | (562) 431 4300 | Other | Anaheim · Orange County | — | — |
| Clear Flow Heating & Air INC | Peter Jr Gonzalez | — | (213) 274 3918 | HVAC | Irvine · Orange County | — | — |
| Clear Sky Landscape INC | Garcia Michael Boyzo | — | (714) 317 8377 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Clear Sky Windows | Clear Sky Windows | — | (714) 204-6702 | Windows, patio, painters | San Bernardino · Orange County | — | — |
| Clear Solutions Pool And Spa Services | Jeff Robert Sieb | — | (949) 285 5412 | Pool | Capistrano Beach · Orange County | — | — |
| Clear View Folding Doors INC | Edgar Gonzalez | info@clearviewfoldingdoors.com | (949) 326-6289 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Clearline Plumbing Solutions | Clearline Plumbing Solutions | — | (714) 960 1474 | Other | Huntington Beach · Orange County | — | — |
| Clearview Mobile Screening | Clearview Mobile Screening | — | (949) 690 9911 | Other | Costa Mesa · Orange County | — | — |
| Clearwater Pool And Spa Service | Joey Luie Anaya | — | (949) 874 7145 | Pool | Laguna Niguel · Orange County | — | — |
| Clemens Enterprises INC | Scott Christopher Clemens | — | (949) 606 6361 | Other | Laguna Beach · Orange County | — | — |
| Clemons Construction | Austin Beau Clemons | — | (949) 910 4062 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Clennair A/c & Heating | Clennair A/c & Heating | — | (949) 770 0371 | HVAC | Huntington Beach · Orange County | — | — |
| Clerel Construction INC | Cassiano Quadros Da Rosa | info@clerelconstruction.com | (949) 281 1007 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Cleveland Marble L P | Elias Naim Ghattas | — | (714) 998 3280 | Other roofers | Orange · Orange County | — | — |
| Clevely Construction | Christopher Robert Clevely | — | (714) 323 8788 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Clever Concrete Construction INC | Juan Rigoberto Lopez | — | (949) 616 0689 | Other | Lake Forest · Orange County | — | — |
| Clewett Backflow | Clewett Backflow | — | (714) 932 3601 | Other | Cypress · Orange County | — | — |
| Clg General Construction INC | Claudio Luis Garces-Tello | — | (714) 737 6078 | GC, remodel, ADU | Orange · Orange County | — | — |
| Cliff Koustik | Cliff Koustik | — | (714) 240 4568 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Cliff Russell's Tree Service | Clifford George Russell | — | (949) 240 8126 | Tree | San Juan Capistrano · Orange County | — | — |
| Clifford & Cruz INC | Suzi Annette Clifford | — | (949) 622 5500 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Climate Air Masters INC | Darlene Estrada Castaneda | — | (714) 533 0402 | HVAC | Anaheim · Orange County | — | — |
| Climate Craft | Climate Craft | — | (562) 740 5585 | HVAC | Costa Mesa · Orange County | — | — |
| Climate Creations | Climate Creations | — | (714) 697 9168 | HVAC | Santa Ana · Orange County | — | — |
| Climate Heroes | Pedro Manuel Perez | — | (714) 552 5677 | HVAC | Santa Ana · Orange County | — | — |
| Climate Pro Mechanical INC | Kenneth Wayne Robinson | — | (800) 841 1021 | HVAC | Los Alamitos · Orange County | — | — |
| Climatrol Refrigeration & HVAC INC | Edgar Antonio Zeledon | — | (949) 680 9441 | HVAC | Santa Ana · Orange County | — | — |
| Climax Ccu Professional Cleaning | Kenneth Josue Ramirez | — | (714) 215 4742 | Other | Newport Beach · Orange County | — | — |
| Clint James Landscaping | Clint James Landscaping | — | (480) 694 4096 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Clinton Lockwood | Clinton Lockwood | — | (562) 634 9659 | Other | Garden Grove · Orange County | — | — |
| Clockwork Construction INC | Andrew Scott Feinour | — | (866) 806 4445 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Closed Circuit Tv Masters INC | Robert Ryan Duran | — | (657) 247 4847 | Electricians | Santa Ana · Orange County | — | — |
| Clover Landscape INC | Carlos Avalos | — | (714) 397 4632 | Windows, patio, painters | Orange · Orange County | — | — |
| Cluff Industries | Cluff Industries | certifier949@gmail.com | (949) 289 5244 | HVAC | San Juan Capistrano · Orange County | — | — |
| Clyde Morgan Carpentry & Construction | Clyde Alan Morgan | — | (714) 839 3455 | GC, remodel, ADU | Garden Grove · Orange County | — | — |