| California Palm Tree Company | Matthew Davis Melkesian | — | (760) 650 0050 | GC, remodel, ADU | Thermal · Riverside County | — | — |
| California Plumbing Commercial & Residential | California Plumbing Commercial & Residential | — | (951) 687 2066 | Other | Riverside · Riverside County | — | — |
| California Plumbing Services | Ronald Anthony Myers | — | (951) 686 7822 | Other | Riverside · Riverside County | — | — |
| California Pool Masters | California Pool Masters | — | (760) 275 9779 | Pool | Palm Desert · Riverside County | — | — |
| California Pools Of Riverside | California Pools Of Riverside | — | (951) 480-7333 | Pool | Murrieta · Riverside County | — | — |
| California Power And Communication | California Power And Communication | — | (760) 586 2952 | Electricians | Temecula · Riverside County | — | — |
| California Pro Flooring | California Pro Flooring | — | (951) 234 6004 | Other | Murrieta · Riverside County | — | — |
| California Reinforcing | Emily Merideth Webster | — | (951) 446 5555 | Other | Menifee · Riverside County | — | — |
| California Rocks | California Rocks | — | (951) 283 9513 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| California Roof Experts | California Roof Experts | — | (424) 535 6828 | Other roofers | Riverside · Riverside County | — | — |
| California Showcase Construction INC | Brian David Jones | — | (951) 682 0208 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| California Shower Pan | California Shower Pan | — | (949) 973 3175 | Other | Lake Elsinore · Riverside County | — | — |
| California Siding Company | Adam Lee Stutzman | — | (951) 552 5632 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| California Technology Builders | California Technology Builders | — | (760) 238 6854 | GC, remodel, ADU | Indio · Riverside County | — | — |
| California Turf Company | Michael Joseph Clark | — | (877) 951 8873 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| California W B Cleaners | California W B Cleaners | — | (714) 981 8060 | Other | San Jacinto · Riverside County | — | — |
| California Wide Electric Services INC | Israel Lopez | — | (844) 225 9433 | Electricians | Moreno Valley · Riverside County | — | — |
| California Window & Door | Timothy Leroy Ellenz | — | (760) 773 1053 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| California Window & Door INC | Timothy Leroy Ellenz | — | (760) 773 1053 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| California Wood Floors Services | Orlando Cam Phan | — | (909) 729 7861 | Other | Eastvale · Riverside County | — | — |
| California's Best Docks | Mychal James Saragoza | — | (951) 429 4190 | Other | Riverside · Riverside County | — | — |
| California's Best Drywall INC | Isela Veronica Ruiz | — | (424) 236 5263 | Other | Norco · Riverside County | — | — |
| California's Finest Painting INC | Peter Jon Garcia | — | (951) 742 5941 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| California's Skyline Painting | California's Skyline Painting | — | (915) 297 7924 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Calimesa Tech Services | Robert Warren Conrad | — | (909) 266 9694 | Electricians | Calimesa · Riverside County | — | — |
| Calisco Electric INC | Jose Gustavo Silva | — | (714) 492 5112 | Electricians | Riverside · Riverside County | — | — |
| Calistar Garage Door | Alberto I Rodriguez | — | (951) 239 5643 | Other | Murrieta · Riverside County | — | — |
| Call That Man | David Allen Zeitz | — | (951) 231 0691 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Callaghan Concrete Construction INC | Jeffery Michael Callaghan | — | (760) 346 1252 | Other | Palm Desert · Riverside County | — | — |
| Calloway Electrical Service | Kenneth Byron Calloway | — | (951) 208 1537 | Electricians | Moreno Valley · Riverside County | — | — |
| Calrq Construction INC | Ruben Quiroga | — | (626) 456 4120 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Calscape Landscaping INC | Joshua Holt Allec | — | (951) 672 3123 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Calvillo Construction Corp | Luciano Calvillo | — | (909) 983 1755 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Caly Home Improvement | Zhou Zeping | — | (626) 616 0028 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Camachos Gardening INC | Torres Ernesto Camacho | — | (760) 777 3937 | Windows, patio, painters | Thermal · Riverside County | — | — |
| Camarillo Drilling INC | Juan Miguel Camarillo Munoz | — | (951) 378 0729 | Other | Nuevo · Riverside County | — | — |
| Cameron Troy | Cameron Troy | — | (760) 831 6901 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| Camery Water Well & Pump Service | Devin Scott Camery | — | (951) 450 1236 | Other | Eastvale · Riverside County | — | — |
| Cammall Electric | James John Cammall | — | (951) 757 4810 | Electricians | Hemet · Riverside County | — | — |
| Camp Constructors INC | William David Lloyd Camp | — | (951) 514 5086 | GC, remodel, ADU | Temecula · Riverside County | — | — |