| Carter's Construction Co | Martin Scott Carter | — | (760) 594 2118 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Cartwright Contracting INC | Jacob William Cartwright | info@cartwrightcontracting.com | (619) 726 6757 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Cartwright Termite & Pest Control INC | Michael Robert Cartwright | — | (619) 442 9613 | Other roofers | El Cajon · San Diego County | — | — |
| Carve Carpentry | Donald Clifton Armstrong | — | (760) 230 7008 | Other | Oceanside · San Diego County | — | — |
| Carvel Services L L C | Carlos Antonio Jr Velarde | — | (857) 300 3719 | Other | Chula Vista · San Diego County | — | — |
| Carver Stone & Tile | Carver Stone & Tile | — | (760) 975 8858 | Other | Vista · San Diego County | — | — |
| Cary Gross Tile INC | Cary Wilton Gross | — | (858) 336 3560 | Other | San Diego · San Diego County | — | — |
| Casa Builders INC | Fernando Gonzalez | aqremodeling2@gmail.com | (619) 618 1052 | Electricians | Alpine · San Diego County | — | — |
| Casa Care | Jonathan Ray Davison | info@casacare.com | (619) 200 8287 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Casa Construction | Cesar Raul Aguilera | — | (619) 947 1470 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Casa De Ebano Cabinetry | Casa De Ebano Cabinetry | — | (760) 884 6441 | Other | Valley Center · San Diego County | — | — |
| Casa Madera Construction | Daniel Joel Betancourt | — | (310) 728 0803 | GC, remodel, ADU | Ramona · San Diego County | — | — |
| Casablanca Heating & Air Conditioning INC | Cass William Anderson | — | (619) 227 4080 | HVAC | San Diego · San Diego County | — | — |
| Casablancas Flooring | Casablancas Flooring | — | (619) 869 0584 | Other | Chula Vista · San Diego County | — | — |
| Casady Electric INC | Scott Michael Casady | contact@claycoelectric.org | (619) 470 6987 | Electricians | Bonita · San Diego County | — | — |
| Casanova Concrete & Equipment | Felipe Casanova | — | (619) 397 8929 | Other | Lemon Grove · San Diego County | — | — |
| Casas Moviles San Diego INC | Paul Matthew Perez | — | (619) 616 1704 | Other | Bonita · San Diego County | — | — |
| Casas Roof Removal | Carlos Alberto Casas | — | (619) 382-9738 | Other roofers | Chula Vista · San Diego County | — | — |
| Casas Tree Service INC | Casas - Hernandez Jose | — | (760) 726 8402 | Tree | Vista · San Diego County | — | — |
| Casbri Development INC | David Allen Lother | — | (760) 579 1900 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Cascade Electrical Contracting Corp DBA Safeway Electric | Matthew Robert Harding | info@safewayelectric.com | (760) 871 2400 | Electricians | Escondido · San Diego County | — | — |
| Cascade Pool's & Spa's | Cascade Pool's & Spa's | — | (619) 665 7665 | Pool | San Diego · San Diego County | — | — |
| Cascata Construction | William Wayne Curtis | — | (858) 900 8072 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Case Construction INC | William Vincent Zilinek | — | (760) 519 7788 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Casey Development INC | Robert Emmett Jr Casey | — | (619) 787 2070 | GC, remodel, ADU | Jamul · San Diego County | — | — |
| Casey Electrical | Scott Hamilton Casey | — | (760) 420 6921 | Electricians | Carlsbad · San Diego County | — | — |
| Casey's Electric INC | Casey Lee Landwehr | — | (760) 943 1430 | Electricians | Encinitas · San Diego County | — | — |
| Casgan INC | David Gregory Martin | — | (800) 577 2551 | Other | San Diego · San Diego County | — | — |
| Casias Construction INC | Virgil Robert Jr Casias | — | (858) 204 8470 | GC, remodel, ADU | Lakeside · San Diego County | — | — |
| Casillas Fences And Gates | Casillas Fences And Gates | — | (760) 415 1593 | Other | Pauma Valley · San Diego County | — | — |
| Casitas Contracting Corporation | Limon Aaron | casitasremodeling@gmail.com | (760) 855 2665 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| Casma Electric | Martinez Fernando | — | (619) 254 2737 | Electricians | San Diego · San Diego County | — | — |
| Casper Company | Brian Christopher Porter | support@casper.com | (619) 589 6001 | Other | Spring Valley · San Diego County | — | — |
| Casper Development Resources INC | Vincent Neal Casper | — | (619) 741 1080 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Caspian Air HVAC INC | Ganshin Aleksei | aleksei@caspianairhvac.com | (760) 821 7517 | HVAC | El Cajon · San Diego County | — | — |
| Caspian Glory INC | Amir Fallahi | filler@godaddy.com | (858) 284 6835 | HVAC | San Diego · San Diego County | — | — |
| Caspian Mechanical INC | Manshadi Farzad Dehghan | steved@precision-ac.com | (619) 694 9188 | HVAC | Santee · San Diego County | — | — |
| Cass Arrieta | Dolores Delia Alvarez | info@cassarrieta.com | (619) 590 0929 | Other | El Cajon · San Diego County | — | — |
| Cass Plumbing & Heating | Larry Dwayne Wyer | steved@precision-ac.com | (619) 223 1486 | HVAC | San Diego · San Diego County | — | — |
| Cass Plumbing Solutions | Cass Plumbing Solutions | info@cassplumbingsolutions.com | (619) 940 8946 | Other | San Diego · San Diego County | — | — |