| Shorebreak Electric Service LLC | Damiao Oliveira Nunes | — | (831) 359 3911 | Electricians | Aptos · Santa Cruz County | — | — |
| Shoreline Landscape Design | Lawrence Wallace Musgrave | — | (408) 315-5050 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Shoreline Property Management | Shoreline Property Management | — | (831) 426-8013 | Property managers | Santa Cruz · Santa Cruz County | — | — |
| Showcase Shower Door Company | Chris Gregory Jr Phillips | — | (831) 464 3899 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Sierra Azul Painting | Sierra Azul Painting | scottpaints131@gmail.com | (831) 212 0105 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| Sightline Construction | William Henry Rickard | billy@sightline.construction | (831) 332 2822 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Signature Builds | Signature Builds | — | (831) 252 0377 | GC, remodel, ADU | Ben Lomond · Santa Cruz County | — | — |
| Silva Construction | John Izalino Silva | — | (831) 750 0830 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Silva Construction | John Paul Silva | — | (831) 252 4601 | GC, remodel, ADU | Boulder Creek · Santa Cruz County | — | — |
| Silverleaf Construction LLC | Sandor Ian Le Barre | silverleafrw@gmail.com | (818) 747-1131 | GC, remodel, ADU | Felton · Santa Cruz County | — | — |
| Simmons Company | Gilbert Dudley Simmons | — | (831) 335 2899 | Other | Scotts Valley · Santa Cruz County | — | — |
| Six Star Roofing INC | Jay Nellson Saber | — | (831) 999 0328 | Other roofers | Santa Cruz · Santa Cruz County | — | — |
| Skaled Up INC | Valter Luis Ferreira Santos | contact@skaledup.com | (831) 435 0180 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Skinner Custom Painting | Robert Michael Skinner | — | (831) 234 2349 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Skye Construction | Colin William Skye | — | (831) 334 8621 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Skylight Window & Door Solutions | Skylight Window & Door Solutions | — | (831) 345 0870 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Sladwick General Engineering Construction | Brian Douglas Sladwick | — | (831) 566 6582 | Other | Felton · Santa Cruz County | — | — |
| Slatter Construction INC | Christine Slatter | — | (831) 425 5425 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Slugocki Construction | Andrew James Slugocki | — | (408) 931 5004 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Smart Construction Services | Gonzalez J Guadalupe | — | (831) 334 7542 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Smartwire | Robert Brian Hubbard | — | (831) 332 0154 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Smith Ds Painting INC | David Allen Smith | — | (831) 566 6807 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Smith Enterprises Electrical Systems INC | Tyler Ladue Smith | — | (831) 345 1320 | Electricians | Boulder Creek · Santa Cruz County | — | — |
| Solid Builders | Solid Builders | — | (831) 535 3998 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| Solid Construction | Brad Owen Williamson | — | (408) 426 0694 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Solid Form Concrete Corp | Juarez Diego Aguilar | — | (831) 228 2764 | Other | Freedom · Santa Cruz County | — | — |
| Solo Specialties Installation | Solo Specialties Installation | — | (831) 840 4250 | Other | Freedom · Santa Cruz County | — | — |
| Soltari LLC | Eric Ryan Heagan | — | (831) 234 0998 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Somerset A Door & Window Co | Somerset A Door & Window Co | — | (831) 476-4693 | Windows, patio, painters | Soquel · Santa Cruz County | — | — |
| Sonny's Roofing | Walter Lee Peck | — | (831) 234 0561 | Other roofers | Soquel · Santa Cruz County | — | — |
| Soquel Tree Service | Jack Thomas Ryan | — | (831) 818 2456 | Tree | Soquel · Santa Cruz County | — | — |
| Soulscape | Eric Charles Johnson | — | (831) 566 8027 | Windows, patio, painters | Scotts Valley · Santa Cruz County | — | — |
| South Bay Painting | South Bay Painting | jfservices255@yahoo.com | (408) 355 0299 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Spa Duck Pools | Christopher Brent Flaming | — | (831) 772 3825 | Pool | Soquel · Santa Cruz County | — | — |
| Spa Duck Specialties INC | Christopher Brent Flaming | — | (831) 772 3825 | Pool | Soquel · Santa Cruz County | — | — |
| Spacecamp Design Build INC | Trevor Matthew Jones | — | (831) 431 3062 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Sparksmith Electric | Kyle Trevor Smith | — | (831) 331 7587 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Spartan Construction | Tursic Enis | — | (408) 595 1644 | GC, remodel, ADU | Scotts Valley · Santa Cruz County | — | — |
| Specialized Renovations | Specialized Renovations | — | (408) 639 8569 | GC, remodel, ADU | Ben Lomond · Santa Cruz County | — | — |
| Specialty Flooring | Specialty Flooring | — | (831) 596 7807 | Other | Aptos · Santa Cruz County | — | — |