| Custom Service Builder | Philip Andrew Walek | — | (714) 362 7487 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Custom Surfaces INC | Victor Wade Young | — | (951) 769 2344 | Other | Beaumont · Riverside County | — | — |
| Custom Tech Rocks | Custom Tech Rocks | — | (951) 712 9119 | Pool | San Jacinto · Riverside County | — | — |
| Custom Tile And Marble Works | Custom Tile And Marble Works | — | (951) 244 4532 | Other | Canyon Lake · Riverside County | — | — |
| Custom Wall Design | Custom Wall Design | — | (760) 774 8195 | Other | Palm Desert · Riverside County | — | — |
| Custom Window Coverings INC | Brian Richard Harvey | — | (951) 296 0895 | Other | Temecula · Riverside County | — | — |
| Custom Wood Concepts LLC | Marco Paul Hernandez Avalos | — | (760) 275 9289 | Other | Palm Springs · Riverside County | — | — |
| Custom Wood Works INC | Duran Gabriel | — | (760) 391 8222 | Other | Indio · Riverside County | — | — |
| Custom Works Welding | Custom Works Welding | — | (951) 500 0749 | Other | Riverside · Riverside County | — | — |
| Customwood Cabinets INC | Steven Henry Sobczyk | — | (760) 773 3833 | Other | Palm Desert · Riverside County | — | — |
| Cutting Edge Excavation INC | Doug James Herman | — | (951) 653 9880 | Other | Riverside · Riverside County | — | — |
| Cutting Edge Garage Doors | Cutting Edge Garage Doors | — | (951) 415 5065 | Other | Norco · Riverside County | — | — |
| Cutting Edge Glazing | Cutting Edge Glazing | — | (909) 965 3025 | Windows, patio, painters | Cherry Valley · Riverside County | — | — |
| Cutting Edge Restoration & Flood | Cutting Edge Restoration & Flood | — | (951) 973 4433 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Cutting Edge Tile | Eric Dominic Fort | interested@domainmarket.com | (951) 461 0968 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Cutting Edge Tile & Stone | Cutting Edge Tile & Stone | — | (951) 422 8421 | Other | Menifee · Riverside County | — | — |
| Cv Blinds And Shades INC | Paul Edward Panko | — | (760) 883 0704 | Other | Rancho Mirage · Riverside County | — | — |
| Cv Electric | Joel Omar Fong | — | (760) 296 9297 | Electricians | La Quinta · Riverside County | — | — |
| Cv Floors | Linda Pearl Pallini | — | (760) 345 0324 | Other | Rancho Mirage · Riverside County | — | — |
| Cv Garage Doors INC | Richard Wayne Allen | — | (760) 898 7050 | Other | Palm Springs · Riverside County | — | — |
| Cv Landscape Solutions | Cv Landscape Solutions | — | (760) 610 3882 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Cv Pipeline Co | William Clinton Harris | — | (760) 610 5563 | Other | Palm Desert · Riverside County | — | — |
| Cvb Plumbing INC | Marvin J Van Bruggen | — | (951) 285 7103 | Other | Murrieta · Riverside County | — | — |
| Cvgc | Christopher Richard Thom Vogt | — | (760) 861 8773 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Cw Hardscape | Cristhian Heredia | — | (909) 961 4062 | Windows, patio, painters | Nuevo · Riverside County | — | — |
| Cw Plumbing & Design INC | Craig Alan Wheeler | — | (951) 894 7703 | Other | Murrieta · Riverside County | — | — |
| Cwc | Charles Howard Watson | — | (951) 805 6470 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Cy Omura | Cy Omura | — | (714) 328 1506 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Cyberhome Builder Corp | Bo Wu | — | (909) 665 6288 | GC, remodel, ADU | Calimesa · Riverside County | — | — |
| Cyclone Plumbing INC | Michael William Casey | — | (714) 887 6918 | Other | Lake Elsinore · Riverside County | — | — |
| Cyle Johnson Electric INC | Jayne Alene Johnson | — | (760) 922 8139 | Electricians | Blythe · Riverside County | — | — |
| Cynthia Rivas | Cynthia Rivas | — | (951) 287 5287 | Other | Sun City · Riverside County | — | — |
| Cyr Concrete Contractors INC | Dominic Lee Cyr | — | (951) 926 1702 | Other | Homeland · Riverside County | — | — |
| D & A Shade And Awning Company | Jonathan Joseph Weisel | — | (760) 770 9974 | Other | Cathedral City · Riverside County | — | — |
| D & B Fire Protection INC | Caridad Candelaria Machado | — | (951) 737 9965 | Other | Corona · Riverside County | — | — |
| D & D Builders | Daniel David Sierras | — | (951) 255 3235 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| D & D Carpet INC | Steven Anthony Willis | — | (760) 202 6800 | Other | Cathedral City · Riverside County | — | — |
| D & D Construction Cleanup | Yadira S Centeno | — | (951) 545 4615 | Other | Riverside · Riverside County | — | — |
| D & D Custom Pools INC | David Michael Fleming | — | (760) 200 7126 | Pool | Thousand Palms · Riverside County | — | — |
| D & D Development | Damon Louis Digregorio | — | (714) 349 2766 | GC, remodel, ADU | Norco · Riverside County | — | — |