| Commercial Aquatics INC | Mark Adam Yarbrough | — | (858) 566 6280 | Pool | San Diego · San Diego County | — | — |
| Commercial Bath Refinishing | Thomas Dievendorf Dewell | — | (858) 554 0505 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Commercial Builders INC | Robert Neil Kay | — | (619) 564 7555 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Commercial Cleaning Of San Diego INC | Joseph Edward Jr Dufresne | info@commercialcleaningsd.com | (858) 224 0088 | Other | San Diego · San Diego County | — | — |
| Commercial Connect Television INC | Timothy Reid Evans | — | (858) 836 1059 | Other | San Diego · San Diego County | — | — |
| Commercial Contracting Specialists INC | Jeffrey Brian Manchester | — | (760) 720 2829 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Commercial Flooring Pro | Danny Guzman | — | (619) 650 8036 | Other | Chula Vista · San Diego County | — | — |
| Commercial Improvement Services INC | Valen Damitrius Jones | service@commercial-improvements.com | (760) 670 1242 | Electricians | San Diego · San Diego County | — | — |
| Commercial Lock & Safe | Edward Omar Leighton | — | (858) 566 6065 | Other | San Diego · San Diego County | — | — |
| Commercial Plumbing & Building INC | Pedro Espinoza Cendejas | — | (408) 449 0680 | Electricians | San Diego · San Diego County | — | — |
| Commercial Plumbing Services | Lawrence Timothy Geersema | — | (858) 245 0240 | Other | San Diego · San Diego County | — | — |
| Commercial Pool Solutions | Commercial Pool Solutions | — | (760) 594 4444 | Pool | San Diego · San Diego County | — | — |
| Commercial Restroom Accessories INC | Terry Michael Banach | — | (619) 659 1205 | Other | Alpine · San Diego County | — | — |
| Commercial Technology Management INC | Jonathan Wright Russell | — | (858) 220 5450 | Other | San Diego · San Diego County | — | — |
| Common Sense Flooring | Common Sense Flooring | — | (760) 717 2818 | Other | Oceanside · San Diego County | — | — |
| Common Sense Solutions INC DBA Cool-roof Systems | Lyle Eugene Orth | — | (760) 747 5970 | Other roofers | San Marcos · San Diego County | — | — |
| Communication Wiring Specialists INC | Vasanth Nanjundes Waran | — | (858) 278 4545 | HVAC | San Diego · San Diego County | — | — |
| Communications World Of San Diego - North INC | Jack Lawrence Jones | — | (858) 549 5000 | Other | San Diego · San Diego County | — | — |
| Community Construction Concepts INC | Fernando Basilio Calimbahin | — | (858) 357 5214 | Electricians | San Diego · San Diego County | — | — |
| Community Development Company | Llanes Osmay | — | (619) 698 4023 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Community Pool Services INC | Thomas Alan Sweeney | communitypools@san.rr.com | (858) 527 0142 | Pool | San Diego · San Diego County | — | — |
| Company Tile 81 Tile & Stone | Dionicio-rangel Martin | — | (619) 665 1303 | Other | Spring Valley · San Diego County | — | — |
| Compass Construction | John Dean Barnes | — | (760) 497 4951 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Compass Drywall | Compass Drywall | — | (619) 573 8023 | Other | San Diego · San Diego County | — | — |
| Compass Remodeling INC | Lionso Contreras | — | (760) 717 7615 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Compass West | Robert Leonard Gramann | — | (760) 481 7477 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Competition Plumbing & Rooter Service | Dennis Cordell Barnett | — | (619) 820 6137 | Other | San Diego · San Diego County | — | — |
| Competitive Concrete Pumping | Competitive Concrete Pumping | — | (619) 885 4353 | Other | El Cajon · San Diego County | — | — |
| Competitive Contracting INC | Carlos Oscar Marron | — | (619) 366 9485 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Competitive Lighting Maintenance Incorporated | Robert B Leider | shawn@hcmsandiego.com | (760) 726 3022 | Electricians | Vista · San Diego County | — | — |
| Competitive Plumbing & Drains INC | Ray Edson Jr Kruger | — | (619) 312 2734 | Other | Lakeside · San Diego County | — | — |
| Competitive Pools LLC | David John Franklin | info@competitive-pools.com | (619) 300 0440 | Windows, patio, painters | Jamul · San Diego County | — | — |
| Complete Blind Service | Alan Kenneth Moore | — | (858) 679 0507 | Other | Poway · San Diego County | — | — |
| Complete Builders INC | Frank Anthony Megura | — | (619) 295 3123 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Complete Commercial Maintenance INC | Eric Raymond Kay | — | (858) 836 2232 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Complete Construction Contractor (c3) Services | Steven Leonard Moffatt | — | (909) 772 5505 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Complete Mep | Carlos Antonio Casares | — | (619) 419 9718 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Complete Mold Remediation And Restoration INC | David George Mikolajczyk | 4davegm@gmail.com | (760) 207 8060 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Complete Outdoor Living LLC | Eric Steven Sr Bennett | — | (619) 492 5883 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Complete Painting Services INC | Carlos Ignacio Medina Quintero | — | (619) 674 7887 | Windows, patio, painters | San Diego · San Diego County | — | — |