| Stephens Mechanical Corporation | Paul Robert Iii Stephens | office@stephensmechanical.com | (925) 301 7572 | Other | Walnut Creek · Contra Costa County | — | — |
| Stephens Mechanical Of The Southwest LLC | Paul Robert Iii Stephens | — | (562) 381 0109 | Other | Walnut Creek · Contra Costa County | — | — |
| Sterling Builders And Real Estate Services | Robert Adrian Mes | — | (925) 299 9643 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Sterry's Construction | Jason Douglas Sterry | — | (925) 348 0087 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Steve L Marquoit Masonry | Steve L Marquoit Masonry | — | (925) 831 0873 | Other | Danville · Contra Costa County | — | — |
| Steve Lloyd Tafoya | Steve Lloyd Tafoya | — | (415) 385 2221 | Other | Antioch · Contra Costa County | — | — |
| Steve Reaves Designs | Steve Reaves Designs | — | (510) 853 1195 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Steve Roberts Painting INC | Steven Michael Roberts | — | (925) 705 0230 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Steve Scott Plumbing | Steve Scott Plumbing | — | (925) 550 9313 | Other | Antioch · Contra Costa County | — | — |
| Steve's Landscape | Steve's Landscape | — | (916) 475 7814 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Steve's Paintworks | Steve's Paintworks | — | (925) 262 3851 | Windows, patio, painters | Moraga · Contra Costa County | — | — |
| Steven B Bates | Steven B Bates | — | (510) 376 6533 | GC, remodel, ADU | Kensington · Contra Costa County | — | — |
| Steven Carzoli General Contractor | Steven Carzoli General Contractor | — | (925) 766 8069 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Steven Labadessa Construction And Design | Labadessa Steven | — | (510) 708 6477 | GC, remodel, ADU | Crockett · Contra Costa County | — | — |
| Steven Peterson Painting INC | Steven Vincent Peterson | — | (408) 903 9145 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| Stevens - Hemingway - Stevens Construction | Thomas Kendric Stevens | — | (925) 228 2816 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Stevens Landscape Design & Development | Stevens Landscape Design & Development | — | (925) 359 5120 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| Stevenson Construction | Kurt Naughton Stevenson | — | (925) 917 0828 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Stevenson Mechanical INC | John Alan Di Matteo | — | (925) 625 9423 | HVAC | Oakley · Contra Costa County | — | — |
| Stewart Heating & Air INC | William Wesley Stewart | — | (925) 427 5522 | HVAC | Pittsburg · Contra Costa County | — | — |
| Stewart Heating And Air Conditioning | Stewart Heating And Air Conditioning | — | (925) 203-9141 | HVAC | Contra Costa County · Contra Costa County | — | — |
| Stewart's Tree Service INC | Patrick Bryan Stewart | — | (925) 252 0442 | Tree | Antioch · Contra Costa County | — | — |
| Stier Engineering | Stier Engineering | — | (951) 805 2440 | Other | Antioch · Contra Costa County | — | — |
| Stillwater General Building Contractors INC | Kevin Sanders Garcia | — | (925) 495 4797 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| Stoddard Plumbing | Stoddard Plumbing | — | (925) 825 5559 | Other | Concord · Contra Costa County | — | — |
| Stoker's Custom Painting | Stoker's Custom Painting | — | (831) 750 4552 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Stokley Properties | Stokley Properties | — | (925) 658-1415 | Property managers | Pleasant Hill · Contra Costa County | — | — |
| Stone & Tile Impressions INC | Oscar George| Soltero George Oscar Soltero | — | (925) 570 7158 | Other | Walnut Creek · Contra Costa County | — | — |
| Stone Built | Stone Built | — | (925) 565 1796 | Other | Concord · Contra Costa County | — | — |
| Stone Tech | Rodriguez Gonzalez Bricio | — | (510) 517 0807 | Other | Richmond · Contra Costa County | — | — |
| Stone Tree | Stone Tree | — | (925) 798 2094 | Tree | Concord · Contra Costa County | — | — |
| Stone Valley Electric LLC | Shahab Taghavi | — | (925) 532 2383 | Electricians | Alamo · Contra Costa County | — | — |
| Stone Valley Marble & Granite | Stone Valley Marble & Granite | — | (925) 262 7144 | Other | Pleasant Hill · Contra Costa County | — | — |
| Storesund Construction INC | Rune Storesund | — | (510) 526 5849 | GC, remodel, ADU | Kensington · Contra Costa County | — | — |
| Storm Plumbing | Brimley Abimael Chun | — | (415) 235 0767 | Other | San Pablo · Contra Costa County | — | — |
| Storm Water Inspection & Maintenance Services LLC | Ricci Joseph Campos | — | (925) 516 8966 | Other | Discovery Bay · Contra Costa County | — | — |
| Stornetta Construction | Lance Patrick Stornetta | — | (707) 580 7307 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Stowers Real Estate | Stowers Real Estate | — | (925) 393-0331 | Property managers | Danville · Contra Costa County | — | — |
| Straight Flush Plumbing & Rooter LLC | Anthony Lee Morin | — | (407) 451 5271 | Other | Pleasant Hill · Contra Costa County | — | — |
| Straight Line Imports INC | Vincent Brian Ingram | — | (925) 335 9801 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |