| Ryan Harper | Ryan Harper | rjharper@syr.edu | (209) 649 5534 | Other | San Andreas · Calaveras County | — | — |
| Ryan's Plumbing | Delvin Lee Mast | — | (209) 993 8244 | Other | San Andreas · Calaveras County | — | — |
| S & S Electric INC | Andrew Scott Cummings | bgehr@sselectric.com | (650) 630 4801 | Electricians | Valley Springs · Calaveras County | — | — |
| S A Bullock Construction Co | Steven Alan Bullock | — | (209) 639 7252 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| S C Payne Construction | Stephen Craig Payne | — | (209) 770 0924 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| S J Myers Construction | Steven Joseph Myers | — | (209) 728 8197 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| S J Smith Construction | Stephen John Smith | — | (408) 410 2105 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Sampson Painting | Sampson Painting | — | (209) 768 5344 | Windows, patio, painters | Arnold · Calaveras County | — | — |
| San Filippo Construction | Maximilian T San Filippo | — | (650) 339 0577 | GC, remodel, ADU | Rail Road Flat · Calaveras County | — | — |
| San Lorenzo Tile | San Lorenzo Tile | — | (510) 278 2522 | Other | Valley Springs · Calaveras County | — | — |
| Sanchez Quality Performance HVAC INC | Hector Mauricio Sanchez | — | (209) 584 4419 | HVAC | Valley Springs · Calaveras County | — | — |
| Sarott Construction Company | Scott Anthony Griffiths | — | (925) 381 9714 | Other | Altaville · Calaveras County | — | — |
| Saul Plumbing INC | Robert Daniel Saul | — | (209) 795 2740 | Other | Avery · Calaveras County | — | — |
| Schar Custom Homes And Remodeling | Schar Custom Homes And Remodeling | — | (925) 324 0004 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Schenkerberg Construction | Jesse Warren Schenkerberg | — | (209) 329 3725 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Scibelli Wood Works | Scibelli Wood Works | — | (209) 785 3247 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Scott Galla | Scott Galla | — | (209) 728 1644 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| Scott Greer Stucco | Scott Greer Stucco | — | (209) 286 1433 | Other | Mokelumne Hill · Calaveras County | — | — |
| Scott Jones Construction | Scott Thomas Jones | — | (209) 606 6406 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Scott Mc Bride Painting | Scott Mc Bride Painting | — | (209) 754 3576 | Windows, patio, painters | West Point · Calaveras County | — | — |
| Scott Redenbaugh Construction | Scott Robert Redenbaugh | — | (209) 595 5699 | GC, remodel, ADU | Mountain Ranch · Calaveras County | — | — |
| Seamless Fire Protection LLC | Kenneth Wayne Mc Graw | — | (408) 544 0589 | Other | Copperopolis · Calaveras County | — | — |
| Sellick Construction | Ronald Charles Sellick | — | (209) 768 0236 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Sequoia Electric INC | William Thomas Christian | — | (831) 278 1850 | Electricians | Avery · Calaveras County | — | — |
| Servpro Of Amador/calaveras Counties | Servpro Of Amador/calaveras Counties | — | (209) 425-0873 | Restoration | Pioneer · Calaveras County | — | — |
| Sharp Designs | Sharp Designs | — | (209) 988 0447 | Other | Mountain Ranch · Calaveras County | — | — |
| Sheehauls Excavation | Sheehauls Excavation | — | (925) 382 4741 | Other | Mokelumne Hill · Calaveras County | — | — |
| Shelby Masonry INC | Clinton Loran Jr Shelby | — | (209) 612 4672 | Other | Copperopolis · Calaveras County | — | — |
| Shepherd Services | William Morris Shepherd | — | (669) 800 9455 | HVAC | Arnold · Calaveras County | — | — |
| Shires Excavation INC DBA Accuarate Excavating | Bryan Lyall Fassbender | — | (209) 795 7077 | Other | Hathaway Pines · Calaveras County | — | — |
| Shores Painting | Shores Painting | — | (650) 738 0387 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Sierra Home Energy Solutions | Sierra Home Energy Solutions | — | (209) 768 5012 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Sierra Pool & Spa | Sierra Pool & Spa | contact@sierrapoolandspa.com | — | Pool | Angels Camp · Calaveras County | — | — |
| Sierra Power Systems LLC | Gary Michael Rigsby | anapbm@gmail.com | (209) 770 9240 | Electricians | Vallecito · Calaveras County | — | — |
| Sierra Tool Time Carpentry | Sierra Tool Time Carpentry | — | (408) 693 7831 | Other | Arnold · Calaveras County | — | — |
| Sierra Water Filtration | Sierra Water Filtration | — | (209) 736 2186 | Other | Vallecito · Calaveras County | — | — |
| Signal Service INC | Mark Andrew Wilson | admin@signalserviceinc.net | (209) 736 4996 | Electricians | Angels Camp · Calaveras County | — | — |
| Simmons-tressler Civil Construction INC | Morgan Thomas Simmons | — | (209) 256 1136 | Other | San Andreas · Calaveras County | — | — |
| Sks Energy | Sks Energy | contact@sks-energy.com | (209) 603 0267 | Electricians | Burson · Calaveras County | — | — |
| Snider Construction | Adam Frederick Snider | — | (209) 795 2847 | GC, remodel, ADU | Camp Connell · Calaveras County | — | — |