| City Painting Co | Kyong Sook Kang | — | (909) 641 3203 | Windows, patio, painters | Rancho Cucamonga · San Bernardino County | — | — |
| Citywide Heating & Cooling LLC | Rodney Ray Koger | — | (323) 751 3753 | HVAC | Fontana · San Bernardino County | — | — |
| Cj Construction Services | Cristian Oregel | — | (907) 701 4522 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Cjs Engineering INC | Christopher Chad Everett | — | (714) 323 5816 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Ck Builders And Consultants INC | Carlos Ulysses Sahagun | — | (909) 614 9918 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Cl Syntech | Cl Syntech | — | (424) 232 6481 | Other | Chino Hills · San Bernardino County | — | — |
| Clara Veronica Alatorre | Clara Veronica Alatorre | — | (909) 732 8852 | Windows, patio, painters | Ontario · San Bernardino County | — | — |
| Claremont Electrical Contractors INC | Hector Vladimir Menjivar | — | (909) 368 9854 | Electricians | Hesperia · San Bernardino County | — | — |
| Clarity Construction | Steven James Jr Robinson | chris@clarity-construction.com | (760) 885 3738 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Clark Electric INC | Laython Lynn Loop | — | (909) 730 0624 | Electricians | San Bernardino · San Bernardino County | — | — |
| Clark Roofing Company | Jason Lee Clark | — | (909) 335 6300 | Other roofers | Redlands · San Bernardino County | — | — |
| Clark Roofing Solutions | Jason Lee Clark | — | (909) 266 4246 | Other roofers | Yucaipa · San Bernardino County | — | — |
| Classic & Richest Tile | Classic & Richest Tile | — | (909) 401 9955 | Other | Fontana · San Bernardino County | — | — |
| Classic Creations Construction | Rene Carlos Drachenberg | rene@classiccreationsconstruction.com | (323) 516 2987 | GC, remodel, ADU | Loma Linda · San Bernardino County | — | — |
| Classic Draperies | Classic Draperies | — | (909) 912-9218 | Other | Alta Loma · San Bernardino County | — | — |
| Classic Heating & Air Conditioning | Classic Heating & Air Conditioning | — | (909) 794 9550 | HVAC | Redlands · San Bernardino County | — | — |
| Classic Kitchens Etc INC DBA John I Adams Construction | Jane Adams | — | (909) 208 4358 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Classic Landscape INC | William Joseph Kolar | — | (909) 825 5100 | Windows, patio, painters | Colton · San Bernardino County | — | — |
| Classic Neon & Sign Services | Martinez Frank | — | (626) 536 4891 | Other | Phelan · San Bernardino County | — | — |
| Classic Restoration & Construction | Ashish Bipin Tolia | — | (909) 931 5280 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Classic Roof TileProtected | Classic Roof Tile | info@classicrooftile.com | (951) 471-2444 | Tile roofers | Colton · San Bernardino County | — | — |
| Classic Tile & Stone | Classic Tile & Stone | interested@domainmarket.com | (760) 881 8117 | Other | Victorville · San Bernardino County | — | — |
| Classic Ultrasonic Blinds Cleaners | Classic Ultrasonic Blinds Cleaners | — | (800) 838 1499 | Other | Upland · San Bernardino County | — | — |
| Clay Gibert Trenching | Clay Gibert Trenching | — | (760) 413 6267 | Other | Yucca Valley · San Bernardino County | — | — |
| Clay Tipton Mitchell | Clay Tipton Mitchell | — | (909) 754 0088 | Electricians | Redlands · San Bernardino County | — | — |
| Clean Power Construction | Victor Hugo Rodriguez Robles | — | (949) 599 4348 | Electricians | Ontario · San Bernardino County | — | — |
| Clean Star Electric | David Anthony Kristy | — | (760) 900 7752 | Electricians | Pinon Hills · San Bernardino County | — | — |
| Clean Up & Removal | Travis John Howard | — | (760) 713 5051 | Other | Phelan · San Bernardino County | — | — |
| Clean-power2n | Stanley Xing Zhang | customerservice@cleanpower2n.com | (909) 757 6948 | Electricians | Chino Hills · San Bernardino County | — | — |
| Clear Cloud Solutions INC | Michael Todd Wright | — | (877) 660 2232 | Electricians | Upland · San Bernardino County | — | — |
| Clear Coast Construction | Christopher Brian Hapner | — | (909) 732 3794 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Clear Construction | Hong Su Kil | info@clearconstruction.com | (909) 270 9902 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Clear Water Plumbing Services | Andrew Michael Coulson | — | (909) 990 1299 | Other | Redlands · San Bernardino County | — | — |
| Clearview Pools INC | Roberto Perez | jerrysanchez77@icloud.com | (626) 375-5612 | Pool | Ontario · San Bernardino County | — | — |
| Clements Landscape | Clements Landscape | — | (909) 481 9177 | Windows, patio, painters | Alta Loma · San Bernardino County | — | — |
| Clemmer Services INC | Arturo Garcia | — | (760) 256 7058 | HVAC | Barstow · San Bernardino County | — | — |
| Cleverest Landscape INC | Antonio Agustin Gaspar | info@cleverestlandscape.com | (951) 464 6964 | Windows, patio, painters | Hesperia · San Bernardino County | — | — |
| Clifford Craig Eagan | Clifford Craig Eagan | — | (909) 910 6038 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Clifford S Hancock/fire Protection Services | Clifford Shawn Hancock | — | (760) 590 4141 | Other | Phelan · San Bernardino County | — | — |
| Cline Cooperative Carpentry | Cline Cooperative Carpentry | — | (559) 310 2171 | Other | Joshua Tree · San Bernardino County | — | — |