| Applied Water Systems | Neal James Raab | — | (805) 434 1200 | Other | Templeton · San Luis Obispo County | — | — |
| Aquamen Plumbing | Aquamen Plumbing | — | (805) 591-8090 | Other | Paso Robles · San Luis Obispo County | — | — |
| Aquastar Pools & Spas | Aquastar Pools & Spas | — | (805) 781-0144 | Pool | San Luis Obispo · San Luis Obispo County | — | — |
| Ar-electric | Aaron Ray Francis | — | (805) 835 1534 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Aram Aghababian Construction | Aghababian Aram | — | (805) 459 1993 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Arbor First | Arbor First | arborfirst@sbcglobal.net | (805) 772 5400 | Tree | Morro Bay · San Luis Obispo County | — | — |
| Arbor Leveling | Marvin Earl Bradford | — | (805) 489 4184 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Arcadian Gardens | Arcadian Gardens | — | (805) 237 0672 | Windows, patio, painters | Creston · San Luis Obispo County | — | — |
| Archer Construction | James Don Archer | — | (928) 202 6589 | GC, remodel, ADU | Oceano · San Luis Obispo County | — | — |
| Archie's Aloha Pest Management | Archie's Aloha Pest Management | — | (805) 792-2444 | Pest, tile roofs | San Luis Obispo · San Luis Obispo County | — | — |
| Architectural Veneer Systems | Steffen Stewart Weeks | — | (805) 801 5213 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Armandos Elite Concrete Construction | Villalobos Armando | — | (805) 610 6804 | Other | Paso Robles · San Luis Obispo County | — | — |
| Armenta Construction | Michael Joseph Armenta | — | (805) 550 5194 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Armet's Landscape INC | Richard Friend Armet | — | (805) 460 9161 | Windows, patio, painters | Templeton · San Luis Obispo County | — | — |
| Armstrong Concrete INC | Jon Roger Scholl | — | (805) 549 8584 | Other | Paso Robles · San Luis Obispo County | — | — |
| Arnold Builders INC | Nicholas Francis Arnold | — | (805) 505 8162 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Aron Canby Welding | Aron Canby Welding | — | (805) 459 3557 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Aronsen Construction | Nicholas Paul Aronsen | — | (805) 748 1126 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Arroyo Grande General Contractor | Vidal Gamaliel Lopez Mejia | — | (805) 471 6733 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Arroyo Grande Glass & Mirror | Stacy Jean Johnson | — | (805) 489 6900 | Windows, patio, painters | Arroyo Grande · San Luis Obispo County | — | — |
| Arroyo Water Well Supply | Kenneth Garret Hunstad | — | (805) 489 2258 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Arthur Construction | Justin Lee Arthur | — | (805) 305 3730 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Arthur J Plummer | Arthur J Plummer | — | (805) 234 2659 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Arthurbuilt Construction INC | Chester Allen Jr Arthur | — | (818) 852 5473 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Artifex Industries INC | Cristino Jose Sandoval | — | (805) 547 9800 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Artisan Builders LLC | Todd Michael Mckinley | — | (805) 900 5178 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Artisan Windows And Doors | Artisan Windows And Doors | — | (805) 852-7001 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Artistryworks Custom Masonry | Artistryworks Custom Masonry | — | (805) 458 1849 | Other | Morro Bay · San Luis Obispo County | — | — |
| Artscape Landscaping | Artscape Landscaping | — | (805) 710 2923 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Ashbaugh Construction | Corey Steven Ashbaugh | — | (805) 215 8480 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Asm Electric | Andrew Scott Mc Mahon | info@asm-electric.com | (805) 980 8977 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| Aspire Colors Painting Company | Rafael Corral Diaz | — | (805) 458 5326 | Windows, patio, painters | Pismo Beach · San Luis Obispo County | — | — |
| Asquith Construction | David Allen Asquith | — | (805) 801 2026 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Associated Development Services Corporation | Richard Donald Jr Low | — | (805) 927 8138 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Associated Pacific Constructors INC | Paul Edward Gillen | — | (805) 772 7472 | Other | Morro Bay · San Luis Obispo County | — | — |
| Associated Traffic Safety INC | Tracy Lorraine Johnston | candace@associatedtrafficsafety.com | (805) 250 8200 | Other | Atascadero · San Luis Obispo County | — | — |
| Astute Building Co | Travis Mcallister Pinedo | — | (805) 434 8975 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Atascadero Door Company | Edgar Martin Gonzalez Tostado | — | (805) 406 2066 | Other | Atascadero · San Luis Obispo County | — | — |
| Atascadero Fence | Atascadero Fence | — | (805) 423 7049 | Other | Atascadero · San Luis Obispo County | — | — |
| Atascadero Glass LLC | Glass Holdings Atascadero | service@atascaderoglass.com | (805) 466 2644 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |