| Cooper Enterprises INC Dba:integrity Drywall | Douglas Michael Cooper | — | (619) 631 4895 | Other | El Cajon · San Diego County | — | — |
| Cooper General Contracting | Bryan Ray Cooper | — | (619) 823 7446 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Cooper Mechanical INC | Charles Scott Ii Cooper | contact@coopermi.com | (858) 752 4540 | HVAC | San Diego · San Diego County | — | — |
| Cooper's Plumbing & Heating | Cooper's Plumbing & Heating | coopersplumbingandheating@outlook.com | (619) 463 6770 | HVAC | Bonita · San Diego County | — | — |
| Copley D M C Corporation | Kay Ellen Krueger | — | (619) 980 9205 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Copoiesis Construction | Soheil T Sefat | — | (949) 293 6001 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Copper And Brass Plumbing | Copper And Brass Plumbing | — | (760) 402 3697 | Other | Warner Springs · San Diego County | — | — |
| Copper Canyon Plumbing And Leak Detection | Daniel James Simoes | — | (619) 820 0559 | Other | San Diego · San Diego County | — | — |
| Copper Construction Contracting | Zephon Robert Dinges | — | (619) 519 3432 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Copper Electric INC | Steven Cecil Coulter | copperel@telus.net | (619) 562 5600 | Electricians | Santee · San Diego County | — | — |
| Copper Ridge Construction | Cristina Adriana Giurea | guy@infinitydesignbuild.com | (858) 361 6703 | GC, remodel, ADU | Poway · San Diego County | — | — |
| Copperline Electric | Jaime Junior Ramirez | — | (619) 548 4757 | Electricians | Lakeside · San Diego County | — | — |
| Cor Security INC | Ty Keith Mullen | info@corsecurity.com | (760) 434 5853 | Alarm and generators | San Marcos · San Diego County | — | — |
| Coral Builders INC | Andrew Adam Frost | — | (858) 245 6305 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Coral Painting | Coral Painting | — | (760) 420 7083 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Coral Pools | Coral Pools | — | (760) 717 7471 | Pool | Oceanside · San Diego County | — | — |
| Corbara Building Group Corporation | Marco Antonio Marroquin | — | (619) 308 6990 | GC, remodel, ADU | National City · San Diego County | — | — |
| Corbella Landscape Management INC | Albert Daniel Corbella | — | (619) 306 0366 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Corbisez Custom Homes | Justin La Rue Corbisez | hello@corbisezcustomhomes.com | (619) 633 9798 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Cordada Construction INC | Fray Francisco Cordada-avila | — | (760) 717 3747 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Cordero Design And Build INC | Rebecca Novoa Cordero | — | (619) 906 9188 | Other | La Mesa · San Diego County | — | — |
| Cordial Cabinets Partnership | Michael Jeffrey Scott | — | (619) 483 7076 | Other | El Cajon · San Diego County | — | — |
| Cordial Floor Specialist | Cordial Floor Specialist | — | (619) 857 2225 | Other | Spring Valley · San Diego County | — | — |
| Cordova Construction | Cordova Erik | cordovaconstruction@gmail.com | (760) 519 1769 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Cordova Construction | Cordova Arthur | cordovaconstruction@gmail.com | (619) 777 3946 | GC, remodel, ADU | San Ysidro · San Diego County | — | — |
| Cordova Construction & Restoration | Patricia Cordova | guy@infinitydesignbuild.com | (619) 857 8171 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Core Construct INC | Zechariah Hoseah Palmer | — | (619) 786 6235 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Core Consulting Group INC | David Alan Ball | interested@domainmarket.com | (858) 863 5700 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Core Contracting INC | James Matthew Moore | — | (760) 683 8308 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Core Electric | Craig Sean Enos | — | (619) 750 3010 | Electricians | La Mesa · San Diego County | — | — |
| Core Plumbing | Don Wayne Schoenberger | — | (858) 538 6025 | Other | San Diego · San Diego County | — | — |
| Core/conan LLC | Pelin Karakas | — | (530) 883 8250 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Coreli Remodeling | Jose Ramon Corona Vazquez | — | (619) 416 6291 | GC, remodel, ADU | National City · San Diego County | — | — |
| Coreline Construction LLC | Joshua Ryan Clouston | — | (541) 728 1370 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Corevolt Power INC | Mohammed Ghassan Fahem | — | (619) 315 4221 | Electricians | El Cajon · San Diego County | — | — |
| Corey Fisher Construction LLC | Corey Adam Fisher | coreyfisherconstruction@gmail.com | (408) 623 8650 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Corke Construction INC | Laurence Charles Corke | — | (858) 756 3393 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Corleys Design/build | Susan Rae Corley | — | (619) 607 7599 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Cornelius Electric | Cornelius Zachary | office@corneliuselectric.com | (760) 420 4866 | Electricians | Carlsbad · San Diego County | — | — |
| Cornell Construction Co | William Cornell Reeves | — | (619) 266 0450 | GC, remodel, ADU | San Diego · San Diego County | — | — |