| Chris Doll Flooring | Chris Doll Flooring | — | (805) 929 7600 | Other | Nipomo · San Luis Obispo County | — | — |
| Chris Harrod Construction | Christopher Michael Harrod | — | (805) 712 4440 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Chris Sunderland Engineering Company | Christopher Thomas Sunderland | — | (805) 709 0202 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Chris Thieme General Contractor | Chris Thieme General Contractor | — | (805) 286 1400 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Christopher O'brien Design & Construction | Christopher Jon O'brien | — | (805) 550 6150 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Chuck Elisarraras Excavation | Chuck Elisarraras Excavation | — | (805) 235 0901 | Other | Atascadero · San Luis Obispo County | — | — |
| Cienaga Services INC | Alarcon Gabriel | — | (805) 481 5310 | HVAC | Pismo Beach · San Luis Obispo County | — | — |
| Cinderella Carpet One And Prosource | Cheryl Anne Talbott | — | (805) 781 2657 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Cipi Construction | Hernandez Cipriano | — | (805) 234 4573 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Cj Matson Construction INC | Christopher James Matson | — | (805) 403 0729 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Cjt Electrical INC | Clifford Jon Taylor | — | (559) 284 4043 | Electricians | Templeton · San Luis Obispo County | — | — |
| Clad General Engineering INC | Billy Gene Jr Kilmer | — | (805) 991 7983 | Other | Grover Beach · San Luis Obispo County | — | — |
| Clark Electric | Patrick Mc Nellis Clark | — | (805) 969 1700 | Electricians | Santa Margarita · San Luis Obispo County | — | — |
| Classic Blinds And Drapery | Brandon Michael Lyons | — | (805) 462 0117 | Other | Atascadero · San Luis Obispo County | — | — |
| Classic Construction & Fabricating | Brett Newell Mitchell | — | (805) 801 6775 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Classic Services | Toby Lee Mitchell | — | (805) 202 8737 | Electricians | Nipomo · San Luis Obispo County | — | — |
| Clayton & Son | Clayton & Son | — | (805) 405 5755 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Clean Lines Cabinetry INC | Benito Iii Escobedo | — | (805) 704 2340 | Other | Atascadero · San Luis Obispo County | — | — |
| Clean Works Construction | Albert Eugene Brooking | — | (805) 464 9311 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Clearview | Clearview | — | (805) 229-1909 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Cliff Goodman Flooring Contractor | Cliff Goodman Flooring Contractor | — | (805) 610 2471 | Other | Paso Robles · San Luis Obispo County | — | — |
| Clinard Construction | Joel Brown Clinard | — | (805) 440 6655 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Clinite Electric | Michael Robert Clinite | — | (805) 459 6733 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Clint Osborne Grading And Paving | Clint Osborne Grading And Paving | — | (805) 434 2966 | Other | Templeton · San Luis Obispo County | — | — |
| Clint Simons Companies INC DBA Premiere Constructors | Clinton Brud Simons | — | (805) 434 5535 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Clipper Creek Charging Station | Clipper Creek Charging Station | — | (877) 694-4194 | EV chargers | San Luis Obispo · San Luis Obispo County | — | — |
| Cloacina LLC | Michael Hayes Ellison | info@cloacina.com | (888) 483 8469 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Close Carpentry | Close Carpentry | — | (805) 459 1394 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Coast Circuit Solutions | Coast Circuit Solutions | — | (805) 888 7153 | Electricians | Pismo Beach · San Luis Obispo County | — | — |
| Coast Construction INC | Richard Lex Blythe | connect@coastconstruction.ca | (805) 934 2500 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Coast Drilling INC | Gerben Brouwer | — | (805) 904 6622 | Other | Grover Beach · San Luis Obispo County | — | — |
| Coast Elevator | Coast Elevator | — | (805) 830 2669 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Coast Fence | Coast Fence | — | (805) 459 4480 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Coast Heating & Air | Coast Heating & Air | — | (805) 748 5182 | HVAC | Los Osos · San Luis Obispo County | — | — |
| Coast Mechanical | Coast Mechanical | — | (805) 296 0037 | Other | Atascadero · San Luis Obispo County | — | — |
| Coast Monument Signs | Coast Monument Signs | — | (805) 710 2298 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Coast Painting INC | Valerie Marie Wrage | coastpainting@gmail.com | (805) 904 9356 | Windows, patio, painters | Pismo Beach · San Luis Obispo County | — | — |
| Coast Plumbing INC | Paul Wahne Miller | — | (805) 550 6324 | Other | Grover Beach · San Luis Obispo County | — | — |
| Coast Range Builders LLC | Andrew Michael Salter | — | (805) 634 8000 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Coast Roofing INC | Robert Jeffery Brewer | — | (805) 773 1422 | Other roofers | Grover Beach · San Luis Obispo County | — | — |