| Colgan Electric | Christopher Gene Colgan | — | (760) 828 3666 | Electricians | Bonsall · San Diego County | — | — |
| Colin Cates Woodcraft | Colin Cates Woodcraft | — | (760) 473 9678 | Other | Fallbrook · San Diego County | — | — |
| Colin's Emergency Roofers | Colin's Emergency Roofers | — | (858) 923-4199 | Other roofers | San Diego · San Diego County | — | — |
| Collier Electric INC | Dave John Collier | admin@airodigital.com | (619) 972 9470 | Electricians | San Diego · San Diego County | — | — |
| Collier Landscaping | Collier Landscaping | — | (510) 725 2753 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Collier Roofing | Jack Wayne Collier | buildzoomsupport@blockrenovation.com | (760) 715 9850 | Other roofers | Escondido · San Diego County | — | — |
| Collins Builder | Collins Builder | — | (619) 366 6999 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Collins Pacific Plumbing INC | Troy Dean Collins | — | (858) 755 4000 | HVAC | San Diego · San Diego County | — | — |
| Collins Plumbing INC | Robin Louise Schaefer | — | (619) 469 0800 | Other | El Cajon · San Diego County | — | — |
| Collom Construction | Michael Steven Collom | — | (619) 660 8282 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Colombo Tile | David Arthur Colombo | — | (619) 813 2740 | Other | La Mesa · San Diego County | — | — |
| Colonial Painting | Colonial Painting | — | (760) 522 0814 | Windows, patio, painters | Vista · San Diego County | — | — |
| Color Me Custom Painting | Color Me Custom Painting | — | (619) 931 4616 | Windows, patio, painters | La Mesa · San Diego County | — | — |
| Color Your World Painting | Color Your World Painting | — | (619) 972 4618 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Colorado Drywall | Colorado Drywall | — | (619) 565 6412 | Other | Chula Vista · San Diego County | — | — |
| Colorcraft Painting And Wallcovering INC | Juan Antonio Duenas | — | (619) 721 4459 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Colori Decorative Arts | Colori Decorative Arts | — | (925) 209 3675 | Windows, patio, painters | Vista · San Diego County | — | — |
| Colorpro Sd INC | Martinez Jorge Flores | — | (619) 954 8432 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Colorscapes Landcare Service INC | Robert Fredrick Yeager | — | (760) 728 1727 | Windows, patio, painters | Fallbrook · San Diego County | — | — |
| Colosseum Marble & Granite INC | Vito Pete Fortunato | — | (619) 286 2120 | Other | San Diego · San Diego County | — | — |
| Colrich California Construction INC | Robert Eric Mitchell | — | (858) 490 2300 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Colson Plumbing LLC | Shan Robert Colson | connect@colsonplumbing.com | (619) 857 9090 | Other | Rancho Santa Fe · San Diego County | — | — |
| Colt Services INC DBA Stanley Steemer San Diego | Steven Ralph Thompson | — | (858) 271 9988 | Other | San Diego · San Diego County | — | — |
| Colton-rain Construction INC | Jonathan Adiv Meyer | — | (760) 815 6553 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Coltrane Fire Protection INC | Pepper Coltrane Williams | — | (619) 596 0737 | Other | Santee · San Diego County | — | — |
| Columbine Landscape INC | Mark Jeffrey Sterk | — | (760) 747 3600 | Windows, patio, painters | Vista · San Diego County | — | — |
| Columbus Tile & Stone | Columbus Tile & Stone | — | (760) 492 5230 | Other | Oceanside · San Diego County | — | — |
| Colvin & Sons | Christopher James Colvin | — | (760) 500 0579 | Windows, patio, painters | Julian · San Diego County | — | — |
| Colwell Equipment | William Perry Colwell | — | (760) 789 7274 | Other | Ramona · San Diego County | — | — |
| Com-pro Floors | Com-pro Floors | — | (858) 449 6885 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Combs Construction Services INC | Patrick Allen Combs | — | (760) 453 9538 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Comfort Air Conditioning And Heating | Nikolay Alekseyevich Melentyev | info@comfortacandheating.com | (858) 519 8003 | HVAC | San Diego · San Diego County | — | — |
| Comfort Bros Heating And Air | Cody Alexander Miller | — | (619) 215-1487 | HVAC | El Cajon · San Diego County | — | — |
| Comfort City Mechanical INC | Alvaro Orozco | — | (888) 542 6262 | HVAC | San Diego · San Diego County | — | — |
| Comfort Craft Heating And Air Conditioning | Andrew Joseph Moore | — | (619) 654 9366 | HVAC | Lakeside · San Diego County | — | — |
| Comfort Maverick Heating And Air-conditioning | Travis Sullivan Hanna | mn@tritonair.net | (760) 224 1405 | HVAC | Oceanside · San Diego County | — | — |
| Comfort Mechanical INC | Sean Michael Caviness | buildzoomsupport@blockrenovation.com | (619) 449 3886 | HVAC | Santee · San Diego County | — | — |
| Comm Tek | Comm Tek | — | (619) 954 1310 | Other | San Ysidro · San Diego County | — | — |
| Command Construction INC | Alisa Marie Mcinnis | — | (760) 712 2970 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Commercial & Industrial Roofing Co INC | Lindsay Lee Merziotis | joehirani@gmail.com | (619) 465 3737 | Other roofers | Spring Valley · San Diego County | — | — |