| #1 Central Coast Landscape INC | Miguel Angel Solis Vargas | — | (805) 717 0739 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| 101 Cast Stone | 101 Cast Stone | sales@caststone.com | (805) 610 9278 | Other | Atascadero · San Luis Obispo County | — | — |
| 101 Excavating LLC | James Mark Scobie | — | (805) 610 5161 | Other | Templeton · San Luis Obispo County | — | — |
| 101 Plumbing | 101 Plumbing | — | (805) 835 9807 | Other | Paso Robles · San Luis Obispo County | — | — |
| 17 Mile Construction Services INC | Mauricio Perez-Santos | — | (831) 620 2301 | GC, remodel, ADU | Creston · San Luis Obispo County | — | — |
| 1776 Roofing Solutions LLC | Benjamin Paul Bickford | — | (805) 887 3639 | Other roofers | Atascadero · San Luis Obispo County | — | — |
| 341E A Schmitz General Engineering | 341E A Schmitz General Engineering | — | (805) 459 4266 | Other | Paso Robles · San Luis Obispo County | — | — |
| 3C Controls | Christopher D Lewis | — | (805) 540 3363 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| 3E Construction LLC | Scott Gregory Sepulveda | — | (805) 610 9031 | Other | Paso Robles · San Luis Obispo County | — | — |
| 3rd Gen Pump & Well | 3rd Gen Pump & Well | — | (805) 904 8808 | Other | Pismo Beach · San Luis Obispo County | — | — |
| 3W Construction INC | Raymond Paul Hasch | wweeiihhuuaanngg@gmail.com | (805) 468 9926 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| 4gs Plumbing | Brad Zachary Gilkey | — | (805) 835 3024 | Other | Paso Robles · San Luis Obispo County | — | — |
| 4th Generation Tree | Morgan Clay Scovell | — | (805) 462 2020 | Tree | Templeton · San Luis Obispo County | — | — |
| 4th Generation Tree | Morgan Clay Scovell | — | (805) 462 2020 | Windows, patio, painters | Templeton · San Luis Obispo County | — | — |
| 5 Cities Builders INC | Joel Bradley Smith | — | (805) 809 3444 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| 5 Star Electrical Services INC | Bruce John Singh | clayton@starelectricalservices.com | (805) 215 4503 | Electricians | Los Osos · San Luis Obispo County | — | — |
| 615 Grove Street INC DBA Rush Creek Construction | Mark Andrew Anderson | — | (805) 440 0720 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| 805 Electric LLC | Brian Garth Erickson | — | (805) 710 3974 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| 805 Floor Covering | 805 Floor Covering | — | (805) 591 0794 | Other | Paso Robles · San Luis Obispo County | — | — |
| 805 Kustom Tile | 805 Kustom Tile | — | (805) 268 3303 | Other | Nipomo · San Luis Obispo County | — | — |
| 805 Pure Water | 805 Pure Water | info@purewater.com | (805) 321 7873 | Other | Atascadero · San Luis Obispo County | — | — |
| 805 Remodel And Construction | Kyle Thomas Isabel | — | (805) 952 2602 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| 805 Rooter | 805 Rooter | — | (805) 287 0619 | Other | Nipomo · San Luis Obispo County | — | — |
| 805 West Landscape INC | Brandon Cordell West | — | (805) 296 3665 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| A & M Roofing | Michael Arthur Bonilla | — | (805) 461 3400 | Other roofers | Atascadero · San Luis Obispo County | — | — |
| A - 2 - Z Handyman And Construction Service | Randy Wayne Pharr | — | (805) 610 8992 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| A - American Sliding Door | A - American Sliding Door | — | (805) 772 7287 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| A - List Pressure Washing LLC | Cole Anthony Schoenthal | — | (805) 975 5877 | Other | Templeton · San Luis Obispo County | — | — |
| A - Town Glass & Window | Carreon Manuel | — | (805) 674 4309 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| A - Town Media | A - Town Media | — | (805) 423 1523 | Other | Atascadero · San Luis Obispo County | — | — |
| A Better Way | A Better Way | — | (805) 543 4405 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| A C Contractors INC | Adolfo Ramirez Cabello | — | (805) 239 7330 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| A D Robinson Plastering | A D Robinson Plastering | — | (805) 489 7193 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| A Fresh Breeze - Mobile Window And Door Screen Repair D- | A Fresh Breeze - Mobile Window And Door Screen Repair D- | — | (805) 439-1461 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| A Garza Construction | Alberto Rolando Garza | — | (805) 550 1248 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| A H Hernandez Construction | Manuel Andres Hernandez | — | (805) 459 8893 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| A J Construction | Andrew Aaron Jennings | — | (805) 234 5626 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| A J Construction Company | Donald Scott Trecartin | — | (805) 540 1344 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| A J Peters Construction | Anthony James Peters | — | (805) 459 8064 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| A James Electric Services LLC | Ajay Heath James | — | (805) 712 8640 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |