| Columbia Builders Of California INC | Thomas Frederick Ehlers | — | (805) 975 3306 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Comet Realty | Comet Realty | — | (805) 546-9925 | Property managers | San Luis Obispo · San Luis Obispo County | — | — |
| Comfort Living | Comfort Living | — | (805) 391 0863 | HVAC | Atascadero · San Luis Obispo County | — | — |
| Community Action Partnership Of San Luis Obispo County INC | James Matthew Mc Namara | — | (805) 541 4122 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Compass Property Group INC | Steven Scott Price | — | (805) 474 7010 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Conant Construction | Monique Rachelle Conant | — | (949) 689 0137 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Concast Studios | Concast Studios | — | (805) 471 0710 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Concrete Concepts | Concrete Concepts | — | (805) 441 0979 | Other | Paso Robles · San Luis Obispo County | — | — |
| Concrete Scapes | Concrete Scapes | — | (808) 936 9220 | Other | Los Osos · San Luis Obispo County | — | — |
| Conklin Kirby Construction | Kirby Gildred Conklin | — | (805) 441 9226 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Conscious Construction | Ethan Towne Richardson | — | (805) 769 7566 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Consolidated Electrical Distributors | Consolidated Electrical Distributors | — | (805) 543-4700 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| Construction INC DBA Estero Glass | Ross Owen Selkirk | — | (805) 748 3163 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Construction Services Unlimited | Bill Gene Jr Barker | — | (805) 440 1078 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Construction Techs | Jerry Louis Ii Perez | — | (805) 234 5304 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Contexto Landscapes | Enrique Guzman | — | (760) 680 1885 | Windows, patio, painters | Grover Beach · San Luis Obispo County | — | — |
| Contractor's Glass Co | Paul Anthony Sverchek | — | (805) 543 0871 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Contractor's Maintenance Service | Contractor's Maintenance Service | — | (805) 543-4558 | Restoration | San Luis Obispo · San Luis Obispo County | — | — |
| Cook's Custom Woodcraft | Cook's Custom Woodcraft | — | (805) 975 2088 | Other | Atascadero · San Luis Obispo County | — | — |
| Cooper Electric Company | Christopher William Cooper | — | (858) 652 9309 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| Copher Tile & Stone INC | Adam Blake Copher | — | (805) 286 7460 | Other | Atascadero · San Luis Obispo County | — | — |
| Copper Summit Electric INC | Martin Jay Jr Humerickhouse | — | (805) 503 2746 | Electricians | Templeton · San Luis Obispo County | — | — |
| Corbet Construction INC | Christopher David Corbet | — | (805) 927 3818 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Corby B Lloyd | Corby B Lloyd | — | (805) 909 8243 | Windows, patio, painters | Cambria · San Luis Obispo County | — | — |
| Cornerstone Construction | Richard Scott Brooks | gwebb@cornerstone-construction.com | (832) 259-2520 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Cory Last Molloy | Cory Last Molloy | — | (805) 801 7376 | Other | Atascadero · San Luis Obispo County | — | — |
| Costera Landscape | Costera Landscape | — | (805) 268 4167 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Cota Companies LLC DBA Modern Perspective Plumbing | Edwardo Jr Cota | — | (805) 801 1917 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Cota's Painting | Cota's Painting | — | (805) 714 5864 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Coulton's Construction Company | Eric Scott Coulton | — | (805) 310 6916 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Country Dreams Const Co | Chatham Ken | — | (805) 423 1662 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Covelop INC | Patrick David Arnold | — | (805) 781 3133 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Covenant Construction Of Ca INC | Luke Joseph Bishop | — | (831) 524 1175 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Cp Landscapes INC | Cory De Wayne Paul | — | (805) 772 1396 | Windows, patio, painters | Morro Bay · San Luis Obispo County | — | — |
| Crafco Services | Donald Noil Crafton | — | (805) 710 2324 | HVAC | Grover Beach · San Luis Obispo County | — | — |
| Craftline Construction | Scott Christopher Warren | info@craftlineconstruction.com | (224) 402-2545 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Craig Hill Plumbing | Craig Hill Plumbing | — | (805) 234 5768 | Other | Grover Beach · San Luis Obispo County | — | — |
| Craig Swanson Construction | Craig Herschel Swanson | — | (909) 754 9363 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Craig Webb | Craig Webb | — | (805) 295 0204 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Craker Construction | Douglas Scott Craker | — | (805) 975 5239 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |