| S D Silva Construction INC | Sandy Dan Silva | — | (805) 550 6650 | Other | San Miguel · San Luis Obispo County | — | — |
| S E H Constr | S E H Constr | — | (805) 801 2431 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| S L O Coatings | S L O Coatings | — | (805) 610 0411 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| S L O Saw | S L O Saw | — | (805) 471 9628 | Other | Paso Robles · San Luis Obispo County | — | — |
| S M G Builders | S M G Builders | — | (805) 471 4064 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| S R G Construction | Sid Ray Garcia | — | (805) 471 0587 | Other | Grover Beach · San Luis Obispo County | — | — |
| S T Electric | Steven Robert Thatcher | — | (805) 541 1690 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| S Vierra Gen Engineering Construction | Stanley Gerard Vierra | — | (805) 610 2387 | Other | Templeton · San Luis Obispo County | — | — |
| Sabol Construction INC | Glen Stephen Sabol | — | (916) 812 0003 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Sabovich And Sons Engineering INC | James Melvin Sabovich | — | (805) 459 2020 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Sage Ecological Landscapes | Todd Matthew Davidson | — | (805) 574 0777 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Salamacha Construction | Jeremy Noel Salamacha | — | (805) 722 2290 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Saldana Custom Painting | Sabino Saldana-Perez | — | (805) 712 1980 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Salem Cabinetry INC | Grznar Jan | jan.salemcompany@gmail.com | (805) 544 2758 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Salomon's Roofing INC | Salinas Martinez Salomon | salomonsroofing@gmail.com | (805) 975 9159 | Other roofers | Templeton · San Luis Obispo County | — | — |
| Sam Bravo - Perfect Handyman | Sam Bravo - Perfect Handyman | — | (805) 461 9407 | Other | Atascadero · San Luis Obispo County | — | — |
| Sam Sawdey Excavating | Sam Sawdey Excavating | — | (805) 610 4275 | Other | Paso Robles · San Luis Obispo County | — | — |
| Sam's Tree 805 INC | Samuel Anthony Ramirez | — | (714) 309-8927 | Tree | Creston · San Luis Obispo County | — | — |
| San Diego Independent Construction INC | Steven Joseph Sherritt | — | (858) 344 4866 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| San Luis Bay Framing | San Luis Bay Framing | — | (805) 709 6859 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| San Luis Butane Distributors | Roberto A Hernandez | — | (805) 239 0616 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| San Luis Customs INC | Gary Wayne Finegan | info@sanluiscustoms.com | (805) 541 4938 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Electric | Timothy Clark Garrison | — | (805) 835 5062 | Electricians | Atascadero · San Luis Obispo County | — | — |
| San Luis Environmental | San Luis Environmental | — | (805) 473-0955 | Restoration | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Glass & Window INC | Timothy Kent Gardner | — | (805) 543 3446 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Junk Removal | San Luis Junk Removal | — | (805) 440 0530 | Other | Atascadero · San Luis Obispo County | — | — |
| San Luis Obispo County Farm Supply Company | Joshua Charles Ianneo | — | (805) 540 6181 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Obispo County Plumbing | San Luis Obispo County Plumbing | — | (805) 441 5903 | HVAC | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Obispo Heating And Air Conditioning INC | Austin Jordan Streamland | — | (805) 423 5119 | HVAC | San Miguel · San Luis Obispo County | — | — |
| San Luis Obispo Painting Company | Joseph Porfirio Rodriguez | — | (805) 541 9946 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Obispo Roofing | San Luis Obispo Roofing | — | (805) 441-8981 | Other roofers | Paso Robles · San Luis Obispo County | — | — |
| San Luis Obispo Tree Service | San Luis Obispo Tree Service | — | (805) 329-3046 | Tree | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Property Management | San Luis Property Management | info@sanluisproperty.net | (805) 541-1822 | Property managers | San Luis Obispo · San Luis Obispo County | — | — |
| San Luis Systems | San Luis Systems | — | (805) 544 2809 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| San Miguel Carpet Repair | San Miguel Carpet Repair | — | (805) 237 1159 | Other | Paso Robles · San Luis Obispo County | — | — |
| San Miguel Heating And Air | San Miguel Heating And Air | — | (805) 712 4890 | HVAC | San Miguel · San Luis Obispo County | — | — |
| Sandes Studio INC | Jose Soria Sanchez | — | (209) 631 7746 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Sanny Painting | Sanny Painting | — | (805) 305 8107 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Santa Maria Acoustical Co INC | Chad Allan Cossey | — | (805) 474 4031 | Other | Grover Beach · San Luis Obispo County | — | — |
| Santiago's Landscaping Services INC | Matias Antolin Santiago | — | (805) 286 5704 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |