| Springtime Landscaping | Jonathan Howard Auxter | — | (805) 886 9210 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Sprinkler King INC | David Dwayne| Wesolowski Dave Wesolowski | sprinklerkingatascadero@gmail.com | (805) 466 4990 | Other | Atascadero · San Luis Obispo County | — | — |
| Sprinkler Pros | James Thomas Lanier | — | (805) 878 5449 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Sprouse Communications INC | Jesse Merio Sprouse | — | (805) 369 2940 | Other | Paso Robles · San Luis Obispo County | — | — |
| St Denis Electric INC | Jeffrey Scott St Denis | — | (805) 440 5555 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| St Francis Landscape INC | Mosqueda Daniel Ojeda | — | (805) 544 8700 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Staben Engineering INC | Roger Alan Staben | — | (805) 320 6321 | Other | Paso Robles · San Luis Obispo County | — | — |
| Stallion Construction | Michael James Kirby | info@stallion-construction.com | (805) 748 1249 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Stalwork INC | Benjamin James Kulick | mail@stalwork.com | (805) 542 0033 | HVAC | San Luis Obispo · San Luis Obispo County | — | — |
| Stark Construction | Andrew Ryan Stark | proteam@mopro.com | (805) 259 7843 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Starphyre Digital Security Services | Starphyre Digital Security Services | — | (805) 664-8273 | Alarm and generators | San Luis Obispo · San Luis Obispo County | — | — |
| Starwood Construction & Development | Larry Alfred Chipman | — | (805) 471 4748 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Stephen Arnold Moore General Contractor | Stephen Arnold Moore General Contractor | — | (408) 515 7253 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Stephen James Painting INC | Stephen James Stachura | — | (805) 423 7553 | Windows, patio, painters | Grover Beach · San Luis Obispo County | — | — |
| Stephen M Silva Ii Incorporated DBA Dasilva Underground | Stephen Manuel Ii Silva | — | (805) 234 4620 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Stephen Nino | Stephen Nino | — | (805) 423 6950 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Stephen Reams Electric | Stephen Edward Reams | — | (805) 550 2575 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| Stephen T Lain | Stephen T Lain | — | (808) 345 3239 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Stephenson Landscape Maintenance | Stephenson Landscape Maintenance | — | (805) 748 9846 | Windows, patio, painters | Arroyo Grande · San Luis Obispo County | — | — |
| Sterling Enterprises | Michael John Brink | interested@domainmarket.com | (805) 540 4455 | GC, remodel, ADU | Avila Beach · San Luis Obispo County | — | — |
| Sterling Higgins Construction INC | Sterling Tanberg Higgins | — | (805) 305 2616 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Steve B Chauvet Cons Services | Steven Bradford Chauvet | — | (805) 215 8937 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Steve Borges Builders | Steve Borges Builders | — | (805) 748 1062 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Steve Bullard Construction | Steven Carroll Bullard | — | (805) 471 0682 | Other | Atascadero · San Luis Obispo County | — | — |
| Steve C Boneso Construction INC DBA Boneso Plumbing And | Steve Craig Boneso | — | (805) 227 4450 | HVAC | Santa Margarita · San Luis Obispo County | — | — |
| Steve Cook Electric INC | Robert Thomas Marcano | — | (805) 550 0070 | Electricians | Atascadero · San Luis Obispo County | — | — |
| Steve Duncan Construction | Steven Gary Duncan | — | (805) 674 4365 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Steve Mark Mc Gill | Steve Mark Mc Gill | — | (805) 550 5655 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| Steve Pahler Construction | Steven Joseph Pahler | — | (805) 423 0561 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Steve Rees Construction | Steven Richard Rees | — | (805) 674 5820 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Steve Sebring Painting | Steve Sebring Painting | — | (805) 458 6168 | Windows, patio, painters | Cayucos · San Luis Obispo County | — | — |
| Steven Allen Sanders | Steven Allen Sanders | — | (805) 440 8813 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Steven J Hajduk Construction | Steven John Hajduk | — | (805) 674 0633 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Steven W Haugen Construction | Steven Wayne Haugen | — | (805) 704 0815 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Steveson Construction | Derek Rae Steveson | — | (805) 904 4927 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Steward Construction Company | Glenn Anthony Steward | — | (805) 431 0402 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Stewart Built Construction | Alex Francis Stewart | — | (435) 640 1450 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Stewart Concrete Sawing | Stewart Concrete Sawing | — | (805) 835 7398 | Other | Paso Robles · San Luis Obispo County | — | — |
| Stinger Construction & Electric Services | Curt Jeffrey Smario | — | (805) 270 4826 | Electricians | Pismo Beach · San Luis Obispo County | — | — |
| Stobbs Construction | William James Stobbs | — | (805) 709 1734 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |