| Coast Strong Exteriors | Adam Jeffrey Troia | info@coaststrongexteriors.com | (805) 904 7229 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Coastal Air HVAC Solutions LLC | Donald David Jr Witters | coastalairhvacsolutions@gmail.com | (949) 942 2070 | HVAC | Los Osos · San Luis Obispo County | — | — |
| Coastal Aquascapes LLC | Kainoa Lewis Matsumoto | — | (808) 652 6289 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Coastal Breeze Electric | Derek Augusto Kenney | — | (805) 748 0416 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| Coastal Builder | Coastal Builder | — | (805) 459 2110 | GC, remodel, ADU | Shell Beach · San Luis Obispo County | — | — |
| Coastal California Construction Company | Paul Brent Bischoff | — | (805) 473 5777 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Coastal Colors Painting | Coastal Colors Painting | — | (805) 668 7036 | Windows, patio, painters | Arroyo Grande · San Luis Obispo County | — | — |
| Coastal Community Builders INC | Gary Howard Grossman | — | (805) 556 3060 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Coastal Construction & Engineering INC | Corey John Sarros | thecoastalconstruction@gmail.com | (805) 458 1458 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Coastal Demo INC | Ryan Scott Gallagher | — | (805) 473 9451 | Other | Pismo Beach · San Luis Obispo County | — | — |
| Coastal Enterprises INC DBA Anderson Construction | Nicholas Jennings Anderson | — | (858) 395 9874 | GC, remodel, ADU | Santa Margarita · San Luis Obispo County | — | — |
| Coastal Finish Construction | Joshua Mc Ammond White | — | (805) 835 2130 | Other | Atascadero · San Luis Obispo County | — | — |
| Coastal Flooring | Coastal Flooring | — | (850) 533-5745 | Other | Los Osos · San Luis Obispo County | — | — |
| Coastal Handyman Services | Michael Kevin Rooney | — | (805) 704 9717 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Coastal Ironworks | Coastal Ironworks | — | (805) 528 7691 | Other | Los Osos · San Luis Obispo County | — | — |
| Coastal Janitoral | Frank Huffman Sanchez | — | (805) 541 4886 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Coastal Plumbing | Coastal Plumbing | — | (805) 610 1078 | Other | Atascadero · San Luis Obispo County | — | — |
| Coastal Tree Experts INC | Sean C Ellis | — | (805) 772 7970 | Tree | Morro Bay · San Luis Obispo County | — | — |
| Coastal Valley Spas | Coastal Valley Spas | coastalvalleyspas@gmail.com | (805) 260-0728 | Pool | San Luis Obispo · San Luis Obispo County | — | — |
| Coastal Valley Tech LLC | Jason Lee Richards | info@coastalvalleytech.com | (805) 821 1256 | Other | Pismo Beach · San Luis Obispo County | — | — |
| Coastal Venture Builders LLC | Robert Glenville Dowling | — | (650) 248 0941 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Coastal View Construction Services INC | Joseph Frank Landry | — | (805) 528 1353 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Coastline Builders | Coastline Builders | — | (805) 550 0290 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Coastline Construction & Remodeling | Alex Carroll Wilkerson | — | (805) 550 1919 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Coastline Grading INC | Cisco John Greco | coastlinegrading@gmail.com | (805) 927 3394 | Other | Cayucos · San Luis Obispo County | — | — |
| Coastline Pool Pros | Coastline Pool Pros | — | (805) 239 8230 | Pool | Paso Robles · San Luis Obispo County | — | — |
| Coastline Utility Service Incorporated | Stephen Manuel Ii Silva | — | (805) 234 4620 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Cobalt Construction Company | Ronald Wayne Perkins | — | (805) 235 1266 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Cobalt INC | Ronald Wayne Perkins | — | (805) 235 1266 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Cobb Construction | Gregory Lynn Cobb | — | (805) 458 8720 | GC, remodel, ADU | Oceano · San Luis Obispo County | — | — |
| Cobb's Tree Care INC | Calvin Lloyd Cobb | — | (805) 489 3249 | Tree | Arroyo Grande · San Luis Obispo County | — | — |
| Cody Electric | Michael Dennis Watson | — | (805) 320 2777 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Cody Runyon Remodeling LLC | Cody Orion Lesawy Runyon | — | (707) 345 6922 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Cody's Carpets | Cody's Carpets | — | (805) 458 1313 | Other | Nipomo · San Luis Obispo County | — | — |
| Coffelt Construction & Transport INC | James Steven Coffelt | — | (831) 212 4998 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Coffman And Hanson | William John Coffman | — | (805) 489 5428 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Collier Electric | John Kemp Collier | — | (805) 431 1407 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Collins & Son Cabinetmakers | Collins & Son Cabinetmakers | — | (805) 710 3694 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Collins Enterprises INC | Reggie Daniel Collins | — | (805) 440 4466 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Colortrends Painting | Colortrends Painting | — | (805) 689 3757 | Windows, patio, painters | Pismo Beach · San Luis Obispo County | — | — |