| San Francisco Terrazzo INC | Randy Scott Gyrion | — | (415) 710 3031 | Other | Hayward · Alameda County | — | — |
| San Leandro Door Company | Paul Eugene Jr Dayton | — | (510) 351 1111 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Sanchez Ironwork | Sanchez Ironwork | — | (510) 632 7329 | Other | San Leandro · Alameda County | — | — |
| Sanchez Painting | Sanchez Painting | interested@domainmarket.com | (510) 565 2342 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Sanchez Prime Ventures | Sanchez Prime Ventures | — | (510) 219 4768 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Sandate Construction Group INC | Jose Manuel Sandate | — | (559) 776 7019 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Sandquist Construction INC | Rickard Sigvard Sandquist | — | (510) 604 1250 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Sang Hoang | Sang Hoang | — | (510) 909 1717 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Sang Phan | Sang Phan | — | (510) 487 4112 | Windows, patio, painters | Union City · Alameda County | — | — |
| Sansei Gardens INC | Irene Trinidad Briggs | info@sanseigardens.com | (925) 226 8760 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Santabay LLC | Radoslav Raklev | — | (301) 501 0182 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Santac Capital INC DBA Santac Construction | Mack Kong San | — | (510) 703 9830 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Santi Remodeling | Santi Remodeling | — | (510) 755 9536 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Sapphire Plumbing | Sapphire Plumbing | — | (510) 427 7009 | Other | Hayward · Alameda County | — | — |
| Sarah Langford | Sarah Langford | — | (510) 559 0048 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Sarah Young Tiling | Sarah Young Tiling | sarah@sarahyoungtiling.com | (510) 450 0250 | Other | Oakland · Alameda County | — | — |
| Saramba Construction | Surafel Tesema Seyoum | — | (510) 561 7941 | Electricians | Berkeley · Alameda County | — | — |
| Sarco Construction | Anthony Louis Sarapochillo | — | (510) 452 9191 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Sattler Electrical Service | Sidney Arnold Sattler | — | (510) 714 4050 | Electricians | Oakland · Alameda County | — | — |
| Saunders Tree Service INC | Octavio William Saunders | — | (925) 200 9057 | Tree | Hayward · Alameda County | — | — |
| Savior Plumbing INC | Tamara Lynn Cortez | — | (925) 461 8549 | Other | Pleasanton · Alameda County | — | — |
| Sayage Refrigeration Co | Shihadeh Hanna Sayage | — | (650) 814 5759 | HVAC | Castro Valley · Alameda County | — | — |
| Sazos Construction INC | Luis Armando Aguirre Sazo | — | (510) 472 7776 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Sbc Builder LLC | Sam Bai Chu | — | (510) 847 6868 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Sbca Plumbing INC | Charles Randall Jr Altizer | — | (650) 458 1188 | Other | Livermore · Alameda County | — | — |
| Sc Electric | Steven Earl Cook | — | (707) 477 7178 | Electricians | Livermore · Alameda County | — | — |
| Sc Flooring INC | Sergio Salvador Cruz Pimentel | — | (408) 561 9129 | Other | Hayward · Alameda County | — | — |
| Sc Summerwood INC | Scott James Cameron | — | (925) 260 4165 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Scaenae | Bridgette D'ann Smith | — | (858) 353 5220 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Scafuri Construction | Anthony Vincent Scafuri | — | (925) 250 1335 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Scally Electric INC | Scally Ciaran | — | (510) 652 6406 | Electricians | Oakland · Alameda County | — | — |
| Schafer Construction | Rudi Alan Schafer | — | (510) 568 7200 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Scheffer Ely Construction | Scheffer Alexander Ely | — | (415) 515 2206 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Schellenberg Construction | Gary Richard Schellenberg | — | (510) 520 2668 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Schneider Electric Buildings Americas INC | Luis Carlos Soto | — | (877) 342 5173 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Schultze Tile | Schultze Tile | — | (510) 697 5627 | Other | Fremont · Alameda County | — | — |
| Schwab Builders INC | Mark Joseph Schwab | contact@schwabbuilders.com | (510) 396 8710 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Schwartz Custom Woodwork | Schwartz Custom Woodwork | — | (714) 393 6519 | Other | Livermore · Alameda County | — | — |
| Schwartzbart Plumbing | Schwartzbart Rodriguez Rouset | — | (415) 539 6293 | Other | Emeryville · Alameda County | — | — |
| Sci Environmental LLC | Joseph George Rehrmann | — | (510) 574 0570 | Other | Hayward · Alameda County | — | — |