| Santos Custom Painting | Santos Custom Painting | — | (310) 784 0966 | Windows, patio, painters | Oceano · San Luis Obispo County | — | — |
| Sargent's Plumbing And Heating INC | Steven James Chenowith | — | (805) 202 6276 | HVAC | Oceano · San Luis Obispo County | — | — |
| Scenic Coast Landscape | Beverly Ann Holt | — | (805) 927 1644 | Windows, patio, painters | Cambria · San Luis Obispo County | — | — |
| Schaefer Custom Homes | Erich Wayne Schaefer | — | (805) 235 0545 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Schalwitz Construction Company | Richard Henry Schalwitz | — | (805) 528 0958 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Schasteen Grading & Paving | Schasteen Grading & Paving | — | (805) 610 5357 | Other | Paso Robles · San Luis Obispo County | — | — |
| Schmidt Construction | Andrew Charles Schmidt | — | (805) 538 8285 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Schmitz Plumbing INC | Louis Henry Schmitz | — | (805) 710 3266 | Other | San Miguel · San Luis Obispo County | — | — |
| Schultz Roofing Specialists | Jesse Daniel Schultz | — | (805) 703 3447 | Other roofers | San Luis Obispo · San Luis Obispo County | — | — |
| Schultz Tree Expert | Schultz Tree Expert | — | (805) 464 9109 | Tree | Atascadero · San Luis Obispo County | — | — |
| Schwind Electric INC | James Michael Schwind | — | (805) 459 6154 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Scileppi Contracting Company | Benjamin Frank Scileppi | — | (541) 890 0826 | Other | Cayucos · San Luis Obispo County | — | — |
| Scoggins Site Development & Engineering | Scoggins Site Development & Engineering | — | (805) 835 9486 | Other | Paso Robles · San Luis Obispo County | — | — |
| Scott Brandon Lathing | Scott Brandon Lathing | — | (805) 441 8332 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Scott Construction | Jeffrey Douglas Scott | general@scott-construction.com | (805) 235 5232 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Scott D Beavers INC DBA Harvey Plumbing Co,hpc | Scott Daniel Beavers | — | (805) 466 4300 | Other | Paso Robles · San Luis Obispo County | — | — |
| Scott Huerta Construction | Scott Martin Huerta | — | (805) 471 3792 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Scott Kinyon Plumbing | Scott Kinyon Plumbing | — | (805) 234 5126 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Scott Meznarich | Scott Meznarich | — | (805) 674 7836 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Scott's Welding & Fabrication | Scott's Welding & Fabrication | — | (805) 440 0018 | Other | Los Osos · San Luis Obispo County | — | — |
| Scovell Tree Surgery | Scovell Tree Surgery | — | (805) 466-0252 | Tree | Atascadero · San Luis Obispo County | — | — |
| Seabright Construction & Plumbing | Michael Leonard Amenta | — | (805) 474 8181 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Seamair General Engineering | Patrick Gregory Phelan | — | (805) 439 4362 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Sean David Patrick | Sean David Patrick | — | (805) 305 1447 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Sean Gilbert Construction | Sean Patrick Gilbert | — | (805) 295 1060 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Sean Lapointe Welding | Sean Lapointe Welding | — | (805) 441 4758 | Other | Paso Robles · San Luis Obispo County | — | — |
| Sears Heating And Air Conditioning | Sears Heating And Air Conditioning | — | (858) 868-3561 | HVAC | San Luis Obispo · San Luis Obispo County | — | — |
| Seawell Construction | Jeremy Eamon Seawell | jeremy@seawellconstruction.com | (805) 710-8454 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Sebo Construction | Scott Sebo | — | (805) 610 4067 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Second Nature Landscapes | Second Nature Landscapes | — | (805) 801 4390 | Windows, patio, painters | Arroyo Grande · San Luis Obispo County | — | — |
| Seico | Matei Vasile | — | (805) 704 3876 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| Seifert Services Corp | Bryan Eugene Seifert | — | (805) 610 1435 | Other | Paso Robles · San Luis Obispo County | — | — |
| Select Craft Construction | Angel Jr Garcia | — | (805) 635 4508 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Selective Security Systems INC | Glenn Randolph Hansen | mondo@selectivesecuritysystems.com | (805) 929 8468 | Electricians | Nipomo · San Luis Obispo County | — | — |
| Selna Construction INC | Timothy John Selna | — | (805) 704 6620 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Selzer Mechanical | Anton John Neuman Selzer | — | (805) 896 7169 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Semmes & Co Builders INC | Paul Fletcher Rose | — | (805) 466 6737 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Sentinel Security Solutions INC | Justin Bradley Sherbon | — | (805) 773 6100 | Electricians | Pismo Beach · San Luis Obispo County | — | — |
| Sequoia Pacific Landscape Co | Kevin Jerome O'donnell | — | (805) 459 3149 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Serda Construction | Serda Steven | — | (805) 235 2757 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |