| Steve P Deetken DBA Deetken Const | Deetken Const | — | (415) 898 5570 | GC, remodel, ADU | Novato · Marin County | — | — |
| Steve Rempe General Contractor INC DBA Rempe Construction | Zachary Lee Rempe | — | (415) 897 9126 | GC, remodel, ADU | Novato · Marin County | — | — |
| Steve Ulsh | Steve Ulsh | — | (415) 519 2565 | Windows, patio, painters | Novato · Marin County | — | — |
| Steven Enjaian Painting | Steven Enjaian Painting | — | (415) 893 9299 | Windows, patio, painters | Novato · Marin County | — | — |
| Steven Hinkley | Steven Hinkley | — | (415) 847 4418 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Steven Mariver | Steven Mariver | — | (707) 975 5670 | Windows, patio, painters | Novato · Marin County | — | — |
| Steven Rikli Construction Company | Steven Lynn Rikli | — | (415) 310 0464 | GC, remodel, ADU | Novato · Marin County | — | — |
| Stillwater Construction | Luke Colby Chambers | — | (415) 306 2404 | GC, remodel, ADU | Novato · Marin County | — | — |
| Stodoni Construction INC | Gospodin Stoianov Tchakalov | — | (415) 602 1020 | Electricians | San Anselmo · Marin County | — | — |
| Stonebridge Construction INC | Noel Anthony Kirby | — | (415) 691 1074 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Storek Architecture/construction | Richard Wencil Storek | — | (415) 388 3030 | GC, remodel, ADU | Greenbrae · Marin County | — | — |
| Stoutbuilt Construction INC | Wayne William Stout | — | (415) 497 8589 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Streckfus Plumbing | Streckfus Plumbing | — | (415) 302 0897 | Other | San Rafael · Marin County | — | — |
| Strom Electric INC | Gerald L Strom | — | (415) 453 1200 | Electricians | San Anselmo · Marin County | — | — |
| Stroub Construction Company INC | Jordan James Guthrie | i.strackbein@stroubconstruction.com | (415) 331 0621 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Structural Concepts Design Build Corp | Stephen Wesley Hosford | info@structuralconceptsdesignbuild.com | (415) 305 3786 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Structural Integrity | Evo Jack Gregorian | — | (415) 730 8985 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Subtle Cabinets LLC | Marques Joaquin Bernales Irgens | info@subtlecabinets.com | (415) 306 3401 | Other | San Anselmo · Marin County | — | — |
| Summit Hill Builders | Robert Chance Portillo | info@summithillbuilders.com | (415) 987 2249 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Summit Professional Builders INC | Jorge Mario Castaneda | — | (415) 454 3280 | GC, remodel, ADU | Kentfield · Marin County | — | — |
| Sumtech | Johnny Vidal Verduzco-trejo | — | (415) 404 1671 | Other | Sausalito · Marin County | — | — |
| Sun Electrics 2 | Sun Electrics 2 | — | (415) 246 2101 | Electricians | Novato · Marin County | — | — |
| Sun First! INC | Aran T Moore | info@sun-first.com | (415) 458 5870 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Sunblock Electric INC | Brad Allen Block | — | (415) 815 5025 | Electricians | Belvedere Tiburon · Marin County | — | — |
| Sunbrite Construction / Hunter's Home Repair | Michael Hunter Spencer | — | (415) 307 6384 | GC, remodel, ADU | Novato · Marin County | — | — |
| Sunrise Builders | Sunrise Builders | — | (415) 902 4277 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Sunset Builders | Sunset Builders | — | (415) 246 9033 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Sunshine Builder | Sunshine Builder | — | (415) 235 2522 | GC, remodel, ADU | Novato · Marin County | — | — |
| Sunshine Flooring | Sunshine Flooring | contact@sunshine-flooring.com | (659) 850-6299 | Other | San Anselmo · Marin County | — | — |
| Sunstall INC | Craig Alan Dinsdale | info@sunstall.com | (415) 707 0305 | Electricians | Novato · Marin County | — | — |
| Superior Roofing Solutions | Kurt David Grosser | — | (415) 491 1144 | Other roofers | San Rafael · Marin County | — | — |
| Surface Experts Of San Francisco North | Caleb Lloyd Hunt | — | (415) 942 4402 | Other | Mill Valley · Marin County | — | — |
| Swett Construction INC | Philip Harold Swett | — | (415) 265 2802 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Swimshine Pool And Spa Maintenance | Swimshine Pool And Spa Maintenance | — | (415) 761 1228 | Pool | Novato · Marin County | — | — |
| Syblon Reid-dutra Jv | Group The Dutra | — | (415) 258 6876 | Other | San Rafael · Marin County | — | — |
| Synapse Electric | Paul Andrew Brunner | — | (415) 985 7298 | Electricians | Mill Valley · Marin County | — | — |
| T C Construction | Juan Antonio Carreno | — | (415) 672 9189 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| T C T Construction | Rafael Alejandro Echenique | — | (415) 497 3666 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| T Champagne | T Champagne | — | (415) 425 2818 | Other | San Rafael · Marin County | — | — |
| T J Nelsen Marine Service Co | Thomas Johnstone Nelsen | — | (415) 332 4957 | Other | Sausalito · Marin County | — | — |