| California Building Maintenance | Jeffrey Allen Brown | — | (951) 204 6309 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| California Coast Construction | Robert Atwood Morris | — | (951) 313 9103 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| California Commercial Electric INC | Michael David Williams | david@californiacommercialelectric.com | (619) 368 5458 | Electricians | Murrieta · Riverside County | — | — |
| California Construction & Roofing INC | Steven Lee Jared | — | (951) 352 0809 | Other roofers | Riverside · Riverside County | — | — |
| California Construction Consultant | David Lawrence Golka | — | (951) 535 0069 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| California Construction Engineering | Rodriguez Rodolfo | — | (818) 314 3060 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| California Contractor Services | Daryl Lee Frazier | — | (760) 674 6070 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| California Contractors Group | Anthony John Douglass | — | (951) 207 5210 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| California Cool Breeze | California Cool Breeze | — | (855) 552 7339 | HVAC | Riverside · Riverside County | — | — |
| California Coolin | California Coolin | — | (951) 249 3297 | HVAC | Murrieta · Riverside County | — | — |
| California Countertops | Francisco Javier Zapata | — | (562) 233 7478 | Other | Riverside · Riverside County | — | — |
| California Crafted Construction | Brittney Ashley Page | — | (760) 522 1885 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| California Custom Electric | Richard William Eggett | — | (714) 713 9741 | Electricians | Corona · Riverside County | — | — |
| California Custom Landscapes | California Custom Landscapes | — | (951) 677 1559 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| California Custom Painting & Design | California Custom Painting & Design | — | (951) 259 4708 | Windows, patio, painters | Hemet · Riverside County | — | — |
| California Door Specialists | California Door Specialists | — | (909) 773 2642 | GC, remodel, ADU | Norco · Riverside County | — | — |
| California Dream Rooms | California Dream Rooms | — | (909) 717 5764 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| California Dust Free Blasting | David John Castaldo | — | (951) 333 1465 | Other | Beaumont · Riverside County | — | — |
| California Easy Renovations INC | Brenda Costantini | — | (760) 641 4414 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| California Efficiency Construction | Enrique Oscar Rollandi-martinasso | — | (323) 440 6229 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| California Efficiency Construction INC | Avila Teodoro Martinez | — | (323) 749 1293 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| California Electric | Alejandro Duenas | hello@california-electric.com | (909) 557 0535 | Electricians | Moreno Valley · Riverside County | — | — |
| California Electric Service Group INC | Christopher Eric Schnell | — | (951) 775 1405 | Electricians | Canyon Lake · Riverside County | — | — |
| California Empire Ac/heating Service | Muro-torres Eric | — | (951) 384 9256 | HVAC | Moreno Valley · Riverside County | — | — |
| California Express Heating And Air LLC | Jose Luis Castro | — | (951) 283 5992 | HVAC | Corona · Riverside County | — | — |
| California Gardens INC | David Isrrael Navarro | — | (760) 989 5155 | Windows, patio, painters | Coachella · Riverside County | — | — |
| California Green Irrigation | California Green Irrigation | — | (951) 347 3820 | Windows, patio, painters | Corona · Riverside County | — | — |
| California Grizzly Heating And Air LLC | Francisco Javier Jr Rivas | — | (442) 515 0530 | HVAC | Murrieta · Riverside County | — | — |
| California Home Center INC | James Irvine Taylor | — | (951) 889 7577 | Electricians | Temecula · Riverside County | — | — |
| California Home Improvement | California Home Improvement | — | (951) 463 3199 | GC, remodel, ADU | Corona · Riverside County | — | — |
| California Homes Painting | California Homes Painting | — | (714) 309 4163 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| California Industrial | Shiraz Ghulamali Ghelani | — | (951) 361 0040 | HVAC | Mira Loma · Riverside County | — | — |
| California Industrial Mechanical & Air INC | Rahim Mansoor Ghelani | — | (951) 681 2100 | HVAC | Mira Loma · Riverside County | — | — |
| California Industrial Refrigeration Machines INC | Rahim Mansoor Ghelani | — | (951) 361 0040 | HVAC | Mira Loma · Riverside County | — | — |
| California Landscape Studios INC | Justin Randall Fox | — | (949) 371 4346 | Windows, patio, painters | Corona · Riverside County | — | — |
| California Lifestyle Screens LLC | Sam Michael Cantu | — | (760) 660 8274 | Other | Riverside · Riverside County | — | — |
| California Mobile Screens INC | Raul Jr Perez | — | (760) 391 8678 | Other | Coachella · Riverside County | — | — |
| California On-site Welding | David Lee Cutsinger | — | (909) 208 2179 | Other | Canyon Lake · Riverside County | — | — |
| California Pacific Drilling | Elliott Dean Vande Poppe | — | (909) 795 7500 | Other | Calimesa · Riverside County | — | — |
| California Paintworks INC | Daniel Earl Alvarez | — | (951) 447 6457 | Windows, patio, painters | Menifee · Riverside County | — | — |