| Complete Care Heat AC & Plumbing | Brian Edward Weaver | — | (951) 377 6333 | HVAC | Norco · Riverside County | — | — |
| Complete Concept Builders | Marcos Izarraras | — | (909) 450 6234 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Complete Home Systems INC | Kent David Biswanger | — | (760) 568 2015 | Other | Palm Desert · Riverside County | — | — |
| Complete Plastering INC | Ragan Jon Pyles | — | (951) 383 8009 | Other | Temecula · Riverside County | — | — |
| Complete Pool Management INC | James George Crosby | — | (951) 775 9595 | Pool | Temecula · Riverside County | — | — |
| Complete Renovations INC | Modesto Alvarado Solis | — | (951) 415 3485 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Complete Thermal Control | Jody Kristan Wallace | service@ctc.llc | (951) 905 5932 | HVAC | Menifee · Riverside County | — | — |
| Complete View Construction Corp | David John Thornton | — | (909) 841 5306 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Completely Dependable Plumbing | Completely Dependable Plumbing | — | (951) 837 1942 | Other | Murrieta · Riverside County | — | — |
| Complus - Nova Creations Construction | Jack Pengyu Zhao | — | (626) 320 2692 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Compressor Air Conditioning & Heating INC | Gutierrez David Leal | — | (760) 610 3118 | HVAC | Mecca · Riverside County | — | — |
| Computer Alert Systems INC | Ryan Scott Thatcher | — | (951) 676 6880 | Electricians | Temecula · Riverside County | — | — |
| Computer Consultants INC | Dustin Ryan Mc Cullum | — | (760) 568 2355 | Other | Palm Desert · Riverside County | — | — |
| Comtron Systems | Montgomery Gordon Sorensen | — | (760) 808 0638 | Electricians | Indian Wells · Riverside County | — | — |
| Comwest Construction | Shawn| Shad Shahriar Shahbazi Shad | — | (951) 954 3600 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Concepcion Ortega | Concepcion Ortega | — | (760) 238 6343 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Concepts Electrical Contractor | Martinez David | — | (619) 607 2472 | Electricians | San Jacinto · Riverside County | — | — |
| Concepts School And Office Furnishings | Concepts School And Office Furnishings | — | (951) 296 1430 | Other | Temecula · Riverside County | — | — |
| Concord Utility Construction Services | Levi Nick Capaci | — | (951) 491 9788 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Concrete And Irrigation Concepts INC DBA Concrete Concepts | Steven Patrick Munoz | — | (951) 490 6685 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Concrete By Design | Thomas John Cusumano | — | (760) 779 4320 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Concrete Reviver | Concrete Reviver | — | (951) 816 2595 | Other | Wildomar · Riverside County | — | — |
| Concretescapes INC | Luis Fernando Rodriguez | — | (760) 343 6098 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Cones Construction | Robert Frank Cones | — | (951) 219 8501 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Congiardo Plumbing | Congiardo Plumbing | — | (951) 733 4371 | Other | Corona · Riverside County | — | — |
| Conklin Construction | Matthew Frances Conklin | — | (951) 347 7613 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Connected Landscape Construction | Luigi Anthony Lara Llamas | — | (951) 595 0341 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Connorp81 INC | Ryan Penhall | — | (951) 525 3281 | Other | Riverside · Riverside County | — | — |
| Conor Kanoski | Conor Kanoski | — | (760) 686 3912 | Windows, patio, painters | La Quinta · Riverside County | — | — |
| Conquering Clutter Closets & Cabinetry | Robert James Rybarski | — | (951) 304 7283 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Conrad's General Hauling | Conrad's General Hauling | — | (951) 367 8556 | Other | Riverside · Riverside County | — | — |
| Conrad's Painting | Conrad's Painting | — | (760) 533 4862 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Conre INC DBA Certainty Professional Painting | Lawrence Thomas Nelson | — | (760) 660 1010 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Consecrete INC | Jonathan Cain Bravo Adame | — | (760) 705 5137 | Other | Wildomar · Riverside County | — | — |
| Conserv Construction INC | Steve Robert Campbell | — | (951) 813 2110 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Conserve Landcare LLC | Colin Israel Bemus | — | (760) 343 1433 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Constant Comfort Heating & Cooling INC | Ryan Christopher Skog | — | (951) 370 0486 | HVAC | Menifee · Riverside County | — | — |
| Constantin Construction | Balan Constantin | — | (951) 236 1011 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Constantino General Contractor INC | Constantino Norberto Barrales | — | (909) 240 9960 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Construct & Maintain Corp | Greg Alan Miller | — | (949) 305 8888 | Electricians | Temecula · Riverside County | — | — |