| Solis Electric INC | Walter Francisco Solis Perez | — | (415) 424 8012 | Electricians | Pinole · Contra Costa County | — | — |
| Solis Masonry INC | Solis Fernando Solis | — | (925) 285 5301 | Other | Bay Point · Contra Costa County | — | — |
| Solo Building Incorporated | Gruenewald Peter | — | (510) 681 6976 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Solomon's Plumbing | Jacob Brian Solomon | — | (415) 298 1611 | Other | Rodeo · Contra Costa County | — | — |
| Some Assembly Required Premanufactured Installations | Some Assembly Required Premanufactured Installations | — | (925) 285 6259 | Other | Concord · Contra Costa County | — | — |
| Sonnikson And Stordahl Construction | Paul Joseph Sonnikson | — | (925) 229 4028 | Other | Martinez · Contra Costa County | — | — |
| Sonny Painting | Sonny Painting | — | (925) 683 9625 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| Sonora Construction | Alvarez Israel | — | (925) 445 5211 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Soria Construction INC | Soria Juan | — | (925) 550 8159 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Sota Construction INC | Talebian Soroush | — | (415) 490 7181 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Sotelo's Garden Tree Service | Gilberto Martinez Sotelo | — | (510) 316 5420 | Tree | San Pablo · Contra Costa County | — | — |
| Soteres Painting | Soteres Painting | — | (510) 557 9101 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Soto Construction | Carlos Martin Soto | — | (925) 812 1783 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Soto H V A C | Soto H V A C | — | (925) 497 7426 | HVAC | Concord · Contra Costa County | — | — |
| Soto's Flooring INC | Alejandro B Soto | — | (925) 732 2375 | Other | Pittsburg · Contra Costa County | — | — |
| Soto's Luxe Flooring INC | Luis Angel Soto Gonzalez | — | (925) 948 6926 | Other | Concord · Contra Costa County | — | — |
| Sousa Co | Alex R Sousa | — | (510) 478 5113 | Other | Pittsburg · Contra Costa County | — | — |
| Southpaw Prefabrications INC | Chuck Clark | — | (916) 801 5327 | Other | Clayton · Contra Costa County | — | — |
| Souza & Sons Interlocking Pavers | Lucas Tarso Alves Da Silva | — | (510) 640 3805 | Other | Rodeo · Contra Costa County | — | — |
| Sp Concrete & Landscaping | Sp Concrete & Landscaping | — | (714) 618 0449 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Spafford Construction | Christopher Calvin Spafford | — | (415) 690 5373 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Sparacino Design And Construction | David Frank Sparacino | — | (925) 917 1006 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Sparkle Pool & Spa Service | Amir Saleh Khashabi | — | (925) 260 5025 | Pool | Walnut Creek · Contra Costa County | — | — |
| Spartan Electrical Construction Company | Anthony John Souza | — | (925) 330 5955 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Spaulding Concrete LLC | Jason Roy Spaulding | info@spauldingconcrete.com | (925) 348 6125 | Other | Walnut Creek · Contra Costa County | — | — |
| Spc Remodeling | Spc Remodeling | — | (925) 787 6661 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Speargrass Environmental Graphics Sign | Maria Lusiana Wirjopranoto | — | (510) 215 5888 | Other | Richmond · Contra Costa County | — | — |
| Specialized Graphics INC | Michael Charles Gratton | emizer@specialized-graphics.com | (925) 680 0265 | Other | Concord · Contra Costa County | — | — |
| Spectacular Painting INC | John Omar Suer | — | (925) 787 4315 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Spectra Coatings INC | Jesus Muela | spectrapowdercoating@gmail.com | (817) 750-2235 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Spectrum Painting And Faux | William C Stevens | — | (925) 798 3709 | Windows, patio, painters | Pacheco · Contra Costa County | — | — |
| Spectrum Pool And Landscape INC | Jose Luis Gonzalez Reyes | — | (925) 939 2905 | Windows, patio, painters | Alamo · Contra Costa County | — | — |
| Speedy Painting & Decoration Corp | Flores Fernando Gomez | — | (510) 500 7895 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Speedy Restoration Inc. | Speedy Restoration Inc. | — | (510) 593-5440 | Restoration | Pleasanton · Contra Costa County | — | — |
| Spencon Construction INC | Steven Victor Stahl | estimating@spenconconstruction.com | (925) 984 2581 | Other | Danville · Contra Costa County | — | — |
| Spoon's Plumbing | Spoon's Plumbing | — | (415) 756 7868 | Other | Antioch · Contra Costa County | — | — |
| Sports Construction Consultant | Philip Edward Park | — | (925) 766 5334 | Other | Alamo · Contra Costa County | — | — |
| Spring Valley General Construction LLC | Jose Roberto Olguin | — | (925) 765 5875 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Spruce Construction INC | Evan Knowlton Hendry | — | (925) 490 9325 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Sprucepoint Builders LLC | Cecilia Jeannine Kerran | — | (650) 823 5719 | GC, remodel, ADU | Danville · Contra Costa County | — | — |