| Salf Flores Drywall LLC | Flores Medina Salomon | — | (707) 396 8153 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Salgado Painting | Salgado Painting | — | (415) 806 4668 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Salic Scaffolding | Milton Everildo Salic Y Salic | — | (510) 210 7022 | Other | Richmond · Contra Costa County | — | — |
| Salinas Flooring | Salinas Flooring | — | (510) 837 5786 | Other | Richmond · Contra Costa County | — | — |
| Salinas V Landscaping INC | Velazquez Franco Salinas | contact@salinasvlandscaping.com | (510) 860 8016 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Sallee Construction | Bradford Scott Sallee | — | (925) 381 5915 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Salluce Electric | Frank John Salluce | — | (925) 628 0651 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Saluni Construction | Saluni Kalolaine | — | (925) 252 6747 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Salvador Alberto Mejia | Salvador Alberto Mejia | — | (925) 768 4490 | GC, remodel, ADU | Hercules · Contra Costa County | — | — |
| Salvato Fabrications LLC DBA Salvato Fabrication & Welding | Matteo Michele Salvato | — | (510) 316 6248 | Other | Richmond · Contra Costa County | — | — |
| Salvia Eco Landscapes | Salvia Eco Landscapes | — | (510) 277 4809 | Windows, patio, painters | El Cerrito · Contra Costa County | — | — |
| Sam Afu | Sam Afu | — | (925) 366 5531 | Other | Concord · Contra Costa County | — | — |
| Sam Best Electric | Samuel Kung Best | — | (925) 858 1985 | Electricians | El Cerrito · Contra Costa County | — | — |
| Sam Garcia Contractor | Sam Garcia Contractor | — | (510) 326 6610 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Sam Vaughan | Sam Vaughan | info@deadduckpress.com | (510) 860 3085 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Sam's Plumbing | Sam's Plumbing | — | (925) 200 5896 | Other | Antioch · Contra Costa County | — | — |
| Sameday Solutions | Mark Alan Stacy | — | (650) 862 1721 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Samuel Vargas Garden & Landscaping Service INC | Samuel Vargas | — | (925) 584 9285 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Samurai Paver Systems | Samurai Paver Systems | waynehurt@hotmail.com | (925) 984 3745 | Other | San Ramon · Contra Costa County | — | — |
| San 49 Painting Company | Alfred Ramirez Pinto | sanpaintingllc@hotmail.com | (609) 706-5901 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| San Francisco Commercial Builders INC | Gregory Burton Ballardo | — | (415) 552 4220 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| San Francisco Remodel | San Francisco Remodel | info@sfrbuilders.com | (510) 367 4934 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| San Miguel Construction | Cobian Mario | — | (925) 383 3771 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| San Ramon Concrete | San Ramon Concrete | jpanetta50@sbcglobal.net | (925) 743 9023 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| San Ramon Drywall | San Ramon Drywall | — | (925) 960 3566 | Other | San Ramon · Contra Costa County | — | — |
| Sanborn's Professional Painting | Sanborn's Professional Painting | — | (925) 338 6198 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Sanchez Builders | Sanchez Builders | — | (925) 348 0993 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Sanchez Construction | Jesus Rios Sanchez | — | (510) 734 1684 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Sanchez Drywall | Sanchez Drywall | — | (925) 328 7434 | Other | Oakley · Contra Costa County | — | — |
| Sanchez Painting | Sanchez Painting | interested@domainmarket.com | (925) 765 8459 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Sanders Contracting INC Metal Stud Framing & Drywall | Kevin Sanders Garcia | — | (925) 308 7305 | Other | Byron · Contra Costa County | — | — |
| Sandi Design & Build | Adnan Marwan Younis | — | (858) 549 9615 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Sandia Landscape Services | Frank Albert Gonzales | — | (510) 774 2768 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Sandmann Construction And Finishing | Richard W Sandmann | — | (925) 250 7007 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Sandoval Plumbing | Sandoval Plumbing | — | (925) 250 2302 | Other | Oakley · Contra Costa County | — | — |
| Sands Construction Company INC | Michael David Sands | — | (925) 263 2421 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Sandstone Engineering INC | Martin Castillo | — | (510) 334 7932 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Sandstone Environmental Engineering INC | Castillo Martin | — | (510) 334 7932 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Sanford Roofing | Hector Rosario Lopez | — | (858) 829 7328 | Other roofers | Moraga · Contra Costa County | — | — |
| Sanh Truong | Sanh Truong | — | (925) 200 0476 | Windows, patio, painters | Antioch · Contra Costa County | — | — |