| Slava's Painting | Slava's Painting | — | (510) 774 3014 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Slb Construction INC | Steven Louis Busch | — | (510) 728 0744 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Slightly Straight Stud Construction | Robert Joseph Jacobs | — | (707) 360 7785 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Slip Busters | Slip Busters | — | (510) 333 3587 | Other | Oakland · Alameda County | — | — |
| Slipac General Contractor | Slipac General Contractor | — | (510) 381 6111 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Small Jobs | Small Jobs | — | (925) 449 9115 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Smart Builders | Smart Builders | — | (510) 304 7752 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Smart Demolition And Excavation INC | Juan Alejandro Galvan | — | (415) 858 3241 | Other | Union City · Alameda County | — | — |
| Smart Electric | Millad Mohammad | — | (510) 990 4677 | Electricians | Fremont · Alameda County | — | — |
| Smart Energy Upgrade Co | Randall Jay Kelly | — | (925) 519 2902 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Smart Pool Service Group INC | Brian Joseph Sexson | — | (925) 292 8916 | Pool | Livermore · Alameda County | — | — |
| Smartscaping | Johnny Ramos Da Silva | — | (510) 684 7053 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Smartvision Technologies LLC | Massoud Ramin Rastkar | jaipur@smartvisiontechnologies.com | (510) 302 8624 | Other | Dublin · Alameda County | — | — |
| Smith & Sons Electric INC | Corinne Helene Thompson | — | (510) 676 4719 | Electricians | Newark · Alameda County | — | — |
| Smith & Whiteley Refrigeration | Smith & Whiteley Refrigeration | — | (650) 280 8180 | HVAC | Hayward · Alameda County | — | — |
| Smith - Hyder INC | Christopher John Hyder | — | (510) 697 8669 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Smith Denison Construction Co | Douglas Kimble Burkhart | — | (925) 606 4433 | Electricians | Livermore · Alameda County | — | — |
| Smithbuilt INC | Kevin Campbell Smith | smithbuilt@gmail.com | (415) 793 9279 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Smj General Construction INC | Mynor Anibal Cruz Pablo | — | (209) 430 8562 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Smp Construction & Maintenance LLC | Mark Anthony Phelps | — | (925) 961 9012 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Smpiw INC DBA San Mateo Precision Iron Work | Wayne Eric Wright | — | (650) 771 6529 | Other | Oakland · Alameda County | — | — |
| Smullin Billt | Smullin Billt | — | (415) 335 2077 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Snyder Home And Commercial Improvements | Snyder Home And Commercial Improvements | — | (510) 207 9088 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| So Unique Painting And Decorating | Mark Anthony Newton | — | (925) 225 1021 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Socrates Construction Services | Socrates Resurin Furagganan | — | (510) 714 2397 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Soft Concrete Designs INC | Victor Manuel Amador | — | (510) 395 3032 | Other | Alameda · Alameda County | — | — |
| Sohnworks | Michael Dong Sohn | — | (510) 847 9298 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Solari And Sons | Solari And Sons | — | (510) 376 4107 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Solarsesame INC | Singh Manandeep | — | (650) 777 8645 | Other roofers | Hayward · Alameda County | — | — |
| Solcom Communications INC | Joseph Anthony Mc Menamin | — | (510) 940 2490 | Other | Hayward · Alameda County | — | — |
| Solid Coat Painting | Solid Coat Painting | contact@sansoxygen.com | (408) 204 5305 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Solid Concrete INC | David Arden Wasser | admin@solidconcretetexas.com | (707) 374 6062 | Other | Berkeley · Alameda County | — | — |
| Solid Core Builder | Solid Core Builder | — | (510) 755 4822 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Solid Ground | Villanueva Vargas Henry | jim@solidground.com | (510) 301 7035 | Other | Oakland · Alameda County | — | — |
| Solid Painting INC | Ernesto Jr Ramirez | — | (510) 460 5253 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Solid Structures Construction INC | Dennis Roberto Morales | — | (341) 465 0489 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Solidrock Development Group INC | Melissa Elena Mcelvane | — | (510) 531 3680 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Solinsky Construction | Benjamin Sprague Solinsky | — | (510) 331 7311 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Solis Builder | Solis Builder | info@indiantypefoundry.com | (510) 372 3039 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Soliz General Construction & Painting INC | Cifuentes Factor Soliz | — | (510) 575 7218 | GC, remodel, ADU | Oakland · Alameda County | — | — |