| Sky Roofing Unlimited INC | Jose Guadalupe Rocha Juache | — | (209) 922 8620 | Other roofers | Stockton · San Joaquin County | — | — |
| Skylar Gunnarson Professional Painting | Skylar Gunnarson Professional Painting | — | (209) 665 8035 | Windows, patio, painters | Escalon · San Joaquin County | — | — |
| Skyline Electric | Stefon Dion Gold | interested@domainmarket.com | (209) 261 8588 | Electricians | Lathrop · San Joaquin County | — | — |
| Skyline Tree Corp | Joel Ontario Valencia Avila | interested@domainmarket.com | (925) 949 9037 | Tree | Tracy · San Joaquin County | — | — |
| Skyz The Limit Creationz Cabinetry | Skyz The Limit Creationz Cabinetry | — | (209) 635 0749 | Other | Manteca · San Joaquin County | — | — |
| Smallie Development INC | Don David Smallie | — | (209) 298 7740 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Smart Way Plumbing | Salguero Cesar Amilcar Ventura | — | (650) 716 3158 | Other | Manteca · San Joaquin County | — | — |
| Sme/thc Joint Venture | Corporation The Herrick | — | (209) 956 4751 | Other | Stockton · San Joaquin County | — | — |
| Smith Coatings | Fred Francis Jr Smith | frediv@smithcoatings.com | (209) 368 3718 | Other roofers | Lodi · San Joaquin County | — | — |
| Smoov Energy & Electric INC | Richard Reginald Jr Hines | eben@eyebytes.com | (510) 575 6008 | Electricians | Stockton · San Joaquin County | — | — |
| Sn Heating And AC | Muhammad Shahzad Rafiq | — | (209) 684 6628 | HVAC | Stockton · San Joaquin County | — | — |
| Snider Construction | Theodore Eugene Snider | — | (209) 481 7153 | GC, remodel, ADU | Lockeford · San Joaquin County | — | — |
| Soha Builders | Soha Builders | — | (209) 607 2129 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Sol Landscape | Sol Landscape | — | (408) 627 3293 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Solano Septic Maintenance | Solano Septic Maintenance | — | (707) 398 6030 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Solantixor SolantixorroofingProtected | Solantixor Solantixorroofing | — | (828) 816-8885 | Tile roofers | Vista · San Joaquin County | — | — |
| Solo Concrete LLC | Jose Leon Lucatero | — | (209) 494 3374 | Other | Ripon · San Joaquin County | — | — |
| Solorio Heating & Air Conditioning | Solorio Heating & Air Conditioning | — | (209) 479 8602 | HVAC | Stockton · San Joaquin County | — | — |
| Solorzano Underground Construction | Josue Sr Solorzano | — | (209) 608 9706 | Other | Manteca · San Joaquin County | — | — |
| Soltero Garage Doors | Soltero Garage Doors | solterodoor@outlook.com | (209) 400 4344 | Other | Lodi · San Joaquin County | — | — |
| Solution Epoxy & Coating | Solution Epoxy & Coating | — | (209) 362 5095 | Other | Tracy · San Joaquin County | — | — |
| Song Construction | Song Kyung Ju | — | (408) 702 7052 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Sonic Interiors INC | James Patrick Hallen | jhallen@sonicinteriors.com | (209) 456 0761 | Other | Tracy · San Joaquin County | — | — |
| Soracco INC | Richard Anthony Jr Soracco | domains@topdomainer.com | (209) 267 4030 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Sos HVAC LLC | Mark Joseph Sandoval | — | (916) 380 8834 | HVAC | Stockton · San Joaquin County | — | — |
| Sosco Paving INC | Sostenes R Cortes | info@soscopaving.com | (510) 677 9806 | Other | Tracy · San Joaquin County | — | — |
| Soto Framing Group | Carlos Soto-Miranda | — | (209) 570 6012 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Soto's Landscape INC | Renderos Mario Soto | — | (650) 770 3444 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Sousa Built Construction LLC | Brad Kent Sousa | — | (209) 406 7010 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| South County Electric & Lighting | Stephen Joseph Rafala | — | (209) 835 5553 | Electricians | Tracy · San Joaquin County | — | — |
| South Pacific Tile & Marble | South Pacific Tile & Marble | — | (209) 303 1931 | Other | Stockton · San Joaquin County | — | — |
| Souza And Viviani Plumbing Co INC | John Phillip Monacelli | — | (209) 719 9811 | Other | Manteca · San Joaquin County | — | — |
| Souza's Heating And Air | Mark Anthony Souza | — | (209) 566 8448 | HVAC | Ripon · San Joaquin County | — | — |
| Spanos Ruhl Construction LLC | Michael Henry Neudeck | — | (209) 815 1646 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Sparky Antonio Electric | Solis Antonio Olazaba | sparkyantonio@gmail.com | (209) 808 6842 | Electricians | Lodi · San Joaquin County | — | — |
| Spartan Scaffold | Spartan Scaffold | — | (408) 709 6582 | Other | Manteca · San Joaquin County | — | — |
| Spearbrave Painting | Spearbrave Painting | — | (209) 329 1769 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| Special T Electric INC | Don Stanley Turner | — | (209) 229 6934 | Electricians | Lathrop · San Joaquin County | — | — |
| Specialty Wood Products INC | Jeffrey Allen Simpson | — | (209) 333 8720 | Other | Lodi · San Joaquin County | — | — |
| Spectrum Restoration | Spectrum Restoration | — | (209) 367 1886 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |