| Rpm Steel Fab & Construction LLC DBA Rpm Construction | Joseph James Park | — | (415) 595 1548 | GC, remodel, ADU | Novato · Marin County | — | — |
| Rubin Construction | Stephen Thomas Rubin | — | (415) 939 8595 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Ruhl Construction | Curtis Everett Ruhl | — | (415) 314 5751 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Runnette Enterprises | Forrester Jason Runnette | — | (415) 225 3705 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Russell Hinton Co | Robert Jordan Satrap | — | (415) 206 0150 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Russell Lococo | Russell Lococo | — | (415) 497 4892 | GC, remodel, ADU | Novato · Marin County | — | — |
| Ryan & Sons Painting Co. | Ryan & Sons Painting Co. | — | (858) 444-7766 | Windows, patio, painters | Carlsbad · Marin County | — | — |
| Ryan Construction | Philip Kurtis Ryan | — | (415) 457 1496 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| S & S Builders | Scott William Slater | — | (415) 419 7971 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| S & S Landscaping INC | Kurt Winters Schottstaedt | — | (415) 454 8290 | Windows, patio, painters | San Rafael · Marin County | — | — |
| S B R G Construction | Salvador Bayron Sr Rodas Garcia | — | (415) 847 3390 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| S C General Construction | Casas-alfaro Saul | info@scgeneralconstruction.com | (415) 717 1252 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| S D R Construction | Saul Deva Rapisardo | — | (415) 328 1369 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| S E L Construction | Samuel Edward Levin | — | (415) 342 0448 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| S E Silveira | S E Silveira | — | (510) 867 4179 | Other | San Rafael · Marin County | — | — |
| S Elliot Painting | S Elliot Painting | — | (415) 479 8448 | Windows, patio, painters | San Rafael · Marin County | — | — |
| S H C I | Shane Alexander Hegarty | — | (415) 608 4791 | GC, remodel, ADU | Novato · Marin County | — | — |
| S Jordan Landscaping | S Jordan Landscaping | — | (415) 308 6484 | Windows, patio, painters | Sausalito · Marin County | — | — |
| S M Eco Engineering INC | Samantha L Merz | — | (415) 519 1245 | Other | Novato · Marin County | — | — |
| S N W Construction | Silas Nathaniel Weston | — | (415) 233 2294 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| S O S Electric | Ronaldo Sales Silveira | — | (415) 328 3773 | Electricians | San Rafael · Marin County | — | — |
| S O S I | Larry Lee Russell | — | (800) 699 7674 | Electricians | Belvedere Tiburon · Marin County | — | — |
| S Waters Plumbing | S Waters Plumbing | office@swatersplumbing.com | (415) 883 7168 | Other | Novato · Marin County | — | — |
| S Waters Plumbing LLC | Kevin Nicholas Hardy | office@swatersplumbing.com | (415) 883 7168 | Other | Novato · Marin County | — | — |
| Sabetian Contracting | Sabetian Arvand | — | (415) 419 9533 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Sack's | Shawn Edward Sack | — | (415) 302 0875 | GC, remodel, ADU | Novato · Marin County | — | — |
| Safe And Sound | Ruben Carlos Rojas | — | (267) 885 9587 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Safe Grounds Construction INC | Udeni Alberto Velasquez | — | (415) 302 2882 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Salamandra Associates | Steven Eugene Salamandra | salassoc@comcast.net | (415) 302 8544 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Salazar Cal Cities | Salazar Cal Cities | — | (415) 328 4649 | Windows, patio, painters | Novato · Marin County | — | — |
| Salima Ezzikhe INC | Salima Ezzikhe Goltser | — | (415) 374 1876 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Salt River Construction Corporation | Barbara K Moseley | — | (415) 601 1024 | Other | Tiburon · Marin County | — | — |
| Samano's Landscaping | Miguel Angel Samano Lule | — | (415) 858 5178 | Windows, patio, painters | Novato · Marin County | — | — |
| Sampson's Landscaping INC | Aaron Douglas Sampson | — | (415) 302 1078 | Windows, patio, painters | Novato · Marin County | — | — |
| Samson Electric Plumbing Heating & Cooling | Sam Jalil Tawasha | — | (415) 827 7754 | HVAC | Novato · Marin County | — | — |
| Samuel George Vaughan | Samuel George Vaughan | — | (415) 209 3443 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Samuel's Contrast Landscape | Samuel's Contrast Landscape | — | (415) 246 7407 | Windows, patio, painters | Novato · Marin County | — | — |
| San Anselmo Const Service | Robert Rolph Gerstenkorn | — | (415) 308 8985 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| San Francisco Holiday Lighting INC | Aaron James Duane Muraski | — | (415) 683 0250 | Other | Novato · Marin County | — | — |
| San Francisco Interiors INC | Robin Patrick Smith | — | (415) 526 1100 | Other | San Rafael · Marin County | — | — |