| Souto Brothers Landscaping & Concrete Construction INC | David Gonsalves Souto | — | (510) 581 4172 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Sovana Construction | Aman Pohyar | — | (510) 563 7006 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Sp Construction | Sunil Arvind Patel | devis@sp-construction.com | (408) 202 9125 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Space Age Satellite | Space Age Satellite | — | (510) 773 3322 | Other | Livermore · Alameda County | — | — |
| Space Demolition INC | Gonzalez Raul Robles | — | (510) 377 9782 | Other | Alameda · Alameda County | — | — |
| Spacetone Acoustics INC | Robert Adin Jr Libby | — | (925) 484 3633 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Spark Building Group | Kevin Enrique Sanchez | — | (310) 980 3626 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Sparkle Services INC | Viral Mahesh Patel | info@sparkleservices.com | (510) 376 8800 | Pool | Fremont · Alameda County | — | — |
| Sparkpro Electric | Yeyfer Edgardo Mendez Bolaj | — | (510) 680 6985 | Electricians | Oakland · Alameda County | — | — |
| Sparky Land Electric | Michael Lee Blodgett | — | (510) 532 8930 | Electricians | Oakland · Alameda County | — | — |
| Sparling Construction | Scott Karl Sparling | — | (510) 898 1600 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Special Marble & Granite | Special Marble & Granite | — | (510) 600 7350 | Other | Hayward · Alameda County | — | — |
| Specialized Heating & Air Conditioning | Specialized Heating & Air Conditioning | — | (510) 886 5853 | HVAC | Castro Valley · Alameda County | — | — |
| Specialty Construction Management | Roxanne Fay Smith | info@specialtyconstructionmanagement.com | (888) 717 2170 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Specialty Hardwood Floors | Specialty Hardwood Floors | — | (510) 387 3155 | Other | Alameda · Alameda County | — | — |
| Specialty Inspections Roofing INC | Mark Joseph Kearns | — | (925) 249 9611 | Other roofers | Pleasanton · Alameda County | — | — |
| Specialty Termite INC | Mark Joseph Kearns | — | (925) 249 9611 | Other roofers | Pleasanton · Alameda County | — | — |
| Specons Construction INC | Juan Alberto Sazo Arias | — | (925) 788 2947 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Speedy Restoration INC | Ortega Rafael | — | (877) 577 3399 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Speedy Stone Tile INC | Abarca Arguello Felix | — | (510) 290 9986 | Other | San Leandro · Alameda County | — | — |
| Splash Of Class Painting And Construction | George Anthony Jr Pacheco | — | (510) 582 0298 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Split Systems Mechanical INC | Pavel Novikau | — | (925) 895 7711 | HVAC | Pleasanton · Alameda County | — | — |
| Sposeto Engineering INC | Vinh Cong Truong | — | (925) 443 4200 | Other | Livermore · Alameda County | — | — |
| Spot Free Duct Cleaning INC | Anson Chong Chau | — | (510) 200 7233 | HVAC | San Leandro · Alameda County | — | — |
| Spr Landscaping INC | Quiroz Agustin Arciga | agustin.arciga@sprlandscaping.com | (510) 209 8466 | Windows, patio, painters | Newark · Alameda County | — | — |
| Spray Foam Customs INC | Ricardo Zuniga Franco | — | (510) 690 4582 | Other | San Lorenzo · Alameda County | — | — |
| Spur X Ranch Improvements INC | Russell Jerrod Piazza | — | (925) 525 0252 | Other | Livermore · Alameda County | — | — |
| Srgr Martinez Construction INC | Guillermo Armando Martinez | — | (650) 483 3940 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Srs Roofing & Solar INC | Steven Glen Ridout | — | (510) 600 2299 | Other roofers | San Leandro · Alameda County | — | — |
| Ss Builder Tech INC | Raja Ramesh Kurapati | info@ssbuildertech.com | (925) 918 2587 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Sshc A Consortium Comprised Of Siemens Mobility INC And Swh A | Mobility INC Siemens | — | (510) 748 1870 | Electricians | Alameda · Alameda County | — | — |
| St Francis Electric INC | Guy Allen Smith | — | (510) 639 0639 | Electricians | San Leandro · Alameda County | — | — |
| St Francis Electric LLC | Robert Lawrence Spinardi | — | (510) 639 0639 | Electricians | San Leandro · Alameda County | — | — |
| Stacy And Witbeck INC | Anthony Dean Wedemeyer | info@stacywitbeck.com | (510) 748 1870 | Electricians | Alameda · Alameda County | — | — |
| Stacy And Witbeck/ghilotti Bros A Joint Venture | And Witbeck INC Stacy | — | (510) 748 1870 | Other | Alameda · Alameda County | — | — |
| Stacy And Witbeck/herzog A Joint Venture | And Witbeck INC Stacy | — | (510) 748 1870 | Other | Alameda · Alameda County | — | — |
| Stacy Witbeck / Mcguire And Hester A Joint Venture | Guire And Hester Mc | — | (510) 748 1870 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Stacy Witbeck/innovative Construction Solutions A Joint Venture | And Witbeck INC Stacy | — | (510) 748 1870 | Other | Alameda · Alameda County | — | — |
| Stacy-modern Transit Constructors A Joint Venture | And Witbeck INC Stacy | — | (510) 748 1870 | Electricians | Alameda · Alameda County | — | — |
| Stafford Partners Limited | Barry Eugene Pilger | — | (510) 251 1948 | GC, remodel, ADU | Berkeley · Alameda County | — | — |