| Cooleys Heating & Air | Joshua Clark Harvey | — | (951) 303 7350 | HVAC | Murrieta · Riverside County | — | — |
| Cooling Solutions | Cooling Solutions | — | (951) 581 0791 | HVAC | Hemet · Riverside County | — | — |
| Cooney Electric INC | Thomas Peter Cooney | — | (909) 208 1319 | Electricians | Temecula · Riverside County | — | — |
| Cooper - Jones HVAC | Cooper - Jones HVAC | — | (442) 256 3085 | HVAC | La Quinta · Riverside County | — | — |
| Cooper Coatings INC | Marshall Frederic Cooper | marshall@coopercoatings.com | (760) 422 4366 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Cooper Engineering Incorporated | Howard Louis Jr Cooper | — | (951) 736 6135 | Other | Corona · Riverside County | — | — |
| Cooper Family Garage Doors LLC | Craig Michael Cooper | — | (714) 553 7547 | Other | Riverside · Riverside County | — | — |
| Cooper's AC & Heating | Cooper's AC & Heating | — | (951) 634 2176 | HVAC | Hemet · Riverside County | — | — |
| Copper Ridge Development | Copper Ridge Development | — | (949) 636 6206 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Cor Tech Construction | Andres Felipe Gimenez | — | (951) 660 5856 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Cora Constructors INC | Dennis Eugene Stockton | — | (760) 674 3201 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Corado Painting | Corado Painting | — | (760) 219 6884 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Coral Reef Plumbing INC | Rangel Macias Jesus | — | (951) 316 2565 | Other | Jurupa Valley · Riverside County | — | — |
| Corbin De Lapp | Corbin De Lapp | — | (951) 522 4498 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Corcoran Construction | Thomas James Iv Corcoran | — | (951) 643 0440 | HVAC | Murrieta · Riverside County | — | — |
| Corcoran Construction | Thomas James Iv Corcoran | — | (951) 304 9658 | HVAC | Murrieta · Riverside County | — | — |
| Corcoran Construction & Remodeling | Brian Alan Corcoran | — | (760) 445 9335 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Cord United Construction | Salas Manuel | — | (951) 425 1084 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| Cordero's Tile & Concrete | Cordero's Tile & Concrete | — | (909) 241 0070 | Other | San Jacinto · Riverside County | — | — |
| Cordoba Construction Corp | Pla David | — | (951) 204 0149 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Cordova General Contractor INC | Gutierrez Rogelio Cordova | — | (760) 899 3036 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Cordova's H V A C | Cordova's H V A C | — | (760) 904 7874 | HVAC | Coachella · Riverside County | — | — |
| Core & Main LP | Arch Steven Jr Bruntlett | — | (909) 574 8662 | Other | Corona · Riverside County | — | — |
| Core Acoustics | Core Acoustics | — | (909) 528 3081 | Other | Beaumont · Riverside County | — | — |
| Core Building Services | Jesus Adolfo Sanchez | — | (760) 578 0435 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Core Landcare INC | Juan Erasmo Jr Rodriguez | — | (760) 625 1300 | Windows, patio, painters | Indio · Riverside County | — | — |
| Core Logistics And Construction INC | Gary Bruce Tilden | — | (951) 688 7840 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Core Resource Services LLC | Christopher Michael Hernandez | marketing@crownpointsolutions.com | (951) 277 8261 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Core Sanding And Grinding INC | Jesse Arthur Suarez | — | (909) 908 7424 | Other | Corona · Riverside County | — | — |
| Core Tree Care LLC | Michael Carl Wasgatt | info@coretreecare.com | (951) 471 8333 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Coreslab Structures ( L.a.) INC | Jonathan Soren Clausen | — | (951) 943 9119 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Coretech Mechanical INC | Kenneth Shawn Flores | — | (951) 595 3500 | Other | Murrieta · Riverside County | — | — |
| Corey Jerome Fisher | Corey Jerome Fisher | — | (323) 921 3545 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Corey Mc Keown | Corey Mc Keown | — | (760) 534 5822 | GC, remodel, ADU | Cathedral City · Riverside County | — | — |
| Corey Walker | Corey Walker | — | (888) 745 3628 | Other | Riverside · Riverside County | — | — |
| Cornelio Jimenez | Cornelio Jimenez | — | (951) 233 7325 | Other | Riverside · Riverside County | — | — |
| Cornelius Foster | Cornelius Foster | — | (562) 340 3369 | Windows, patio, painters | Corona · Riverside County | — | — |
| Cornell Building & Design INC | Thomas Herman Cornell | — | (951) 303 6075 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Cornell Building INC | Thomas Herman Ii Cornell | — | (951) 252 3643 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Cornerstone Capital Development Services INC | Albert Lalane Cruse | — | (951) 990 9794 | GC, remodel, ADU | Corona · Riverside County | — | — |