| Seegert Construction | Steven Christopher Seegert | steven@seegertconstruction.com | (916) 599 1782 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Seegert Construction INC | Steven Christopher Seegert | steven@seegertconstruction.com | (916) 599 1782 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Seegert Facilities INC | Steven Christopher Seegert | — | (916) 559 1782 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Selzer Paver | Selzer Paver | — | (707) 308 5518 | Other | Woodland · Yolo County | — | — |
| Sergio A Vega | Sergio A Vega | — | (916) 868 2992 | Other | Woodland · Yolo County | — | — |
| Serpa Construction | Gabriel Alberto Serpa | — | (530) 902 9514 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Serrato Asphalt | Jerry Lee Golobe | — | (916) 870 5984 | Other | West Sacramento · Yolo County | — | — |
| Service Master Restore | Marius Cantea | — | (916) 617 2603 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Sexton Plumbing | Sexton Plumbing | — | (916) 870 4694 | Other | West Sacramento · Yolo County | — | — |
| Shaffer Construction | David Grant Shaffer | — | (530) 908 7174 | GC, remodel, ADU | Yolo · Yolo County | — | — |
| Shane Brown Electric | Shane Alan Brown | shaneb@shanebrownelectric.com | (530) 980 1737 | Electricians | Woodland · Yolo County | — | — |
| She Will Global Development | She Will Global Development | — | (916) 370 5151 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Shellhammer Construction INC | Matthew Jeffrey Shellhammer | info@shellhammerconstruction.com | (530) 661 1313 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Sheri Khodayari | Sheri Khodayari | — | (530) 867 3859 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Sherwin Home Repairs | Sherwin Home Repairs | — | (530) 979 7747 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Sierra Grading & Paving | Sierra Grading & Paving | — | (916) 240 0845 | Other | West Sacramento · Yolo County | — | — |
| Sign Technology INC | Dallas Aaron Dorn | — | (916) 372 1200 | Other | West Sacramento · Yolo County | — | — |
| Sira Contractors Corporation | John David Siracusa | — | (530) 795 0213 | GC, remodel, ADU | Winters · Yolo County | — | — |
| Skaggs Construction | Steven Lawrence Skaggs | — | (530) 681 5748 | Other | Winters · Yolo County | — | — |
| Smart Energy Solutions | Vladimir Martynyuk | — | (844) 787 7888 | HVAC | West Sacramento · Yolo County | — | — |
| Smitty's Home Repair | Smitty's Home Repair | — | (408) 821 2309 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Snow Landscape INC | Donald Ernest Snow | — | (530) 759 9930 | Windows, patio, painters | Winters · Yolo County | — | — |
| Snow Quality Construction INC | Tim Patrick Snow | — | (916) 628 7867 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Snows Oil Field Service INC | Barrett Keith Nickell | — | (530) 661 6746 | Other | Woodland · Yolo County | — | — |
| Snw Builders | Const Co Wade's | — | (530) 505 9139 | GC, remodel, ADU | Winters · Yolo County | — | — |
| Solorio's Tree Service INC | Gerardo Solorio | gerardosolorio.1972@gmail.com | (530) 908 0394 | Tree | Woodland · Yolo County | — | — |
| Sonco | Ronald Wayne Larsen | — | (530) 795 0819 | HVAC | Winters · Yolo County | — | — |
| Sound Vision | Sound Vision | — | (916) 296 5393 | Other | Davis · Yolo County | — | — |
| Southport Construction | Kevin Andrew Askew | — | (916) 718 0422 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Southport HVAC INC | Hassib Said | %20southporthvac@gmail.com | (916) 245 6175 | HVAC | West Sacramento · Yolo County | — | — |
| Spm Electric | Kondrashov Sergey | — | (916) 730 0624 | Electricians | West Sacramento · Yolo County | — | — |
| Spurlock Electric | Eric Lynn Spurlock | — | (530) 304 4202 | Electricians | Woodland · Yolo County | — | — |
| Steadfast Construction | Samuel Knight Maynard | — | (707) 410 7570 | GC, remodel, ADU | Winters · Yolo County | — | — |
| Stephen La Rue Scott | Stephen La Rue Scott | — | (916) 802 1997 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Steve Holm Plumbing INC | David Lewis Holm | — | (530) 902 5000 | Other | Davis · Yolo County | — | — |
| Steven A Young | Steven A Young | — | (530) 908 9275 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Steven L Alger | Steven L Alger | — | (530) 758 1873 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Stites Family Electric INC | Philip Ford Stites | — | (530) 902 1029 | Electricians | Dunnigan · Yolo County | — | — |
| Stonebrite Construction Group INC | Avel Surenovich Vaniyev | — | (916) 821 6651 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Stony Creek Construction INC | Kevin Douglas Hawkins | — | (530) 908 5428 | GC, remodel, ADU | Davis · Yolo County | — | — |