| The Drywall Co By Eric Conrado | Eric Alejandro Conrado | — | (415) 971 1837 | Other | Novato · Marin County | — | — |
| The Dutra Group | Harry Kenneth Stewart | — | (415) 258 6876 | Electricians | San Rafael · Marin County | — | — |
| The Electrician Inc. | The Electrician Inc. | — | (608) 848-4977 | EV chargers | San Rafael · Marin County | — | — |
| The Englander Building Company | Peter James Englander | — | (415) 710 7843 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| The European Construction | Balogh Norbert | — | (415) 827 2448 | GC, remodel, ADU | Stinson Beach · Marin County | — | — |
| The Furnace Man INC DBA Berardi Mechanical | Mark Louis Berardi | — | (415) 883 7070 | HVAC | Novato · Marin County | — | — |
| The Hawthorne Company | David Scott Gordon | — | (415) 310 1639 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| The Home Doctors | Mclean Gerald | — | (415) 883 4085 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| The Land Collaborative | Brett Hardin Mc Pherson | — | (415) 819 5263 | Windows, patio, painters | Novato · Marin County | — | — |
| The Natural Builders | The Natural Builders | — | (510) 325 4277 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| The Neighborhood Plumber | Alexander Constantine Vassiliou | — | (415) 306 4382 | Other | San Rafael · Marin County | — | — |
| The Passion Construction INC | Kyong Haeng| Cho Chris Cho | — | (408) 373 3423 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| The Projection Room INC | Geoffrey Grinnell Franklin | benoit@projection-room.be | (415) 686 9060 | Other | San Rafael · Marin County | — | — |
| The Tile Guy | The Tile Guy | paul@tile-guy.com | (415) 261 4995 | Other | San Rafael · Marin County | — | — |
| The Weiss Company INC | Weiss Daniel | — | (415) 435 8182 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Things Of Beauty | Things Of Beauty | donate@opencart.com | (415) 717 9812 | Other | Novato · Marin County | — | — |
| Third Eye Electric LLC DBA Mister Sparky | Christopher Michael Clinton | — | (415) 320 4392 | Electricians | Novato · Marin County | — | — |
| Thomas Design Construction | Marcelo Alfonso Veristain | — | (415) 297 0197 | GC, remodel, ADU | Novato · Marin County | — | — |
| Thomas E Lovelace | Thomas E Lovelace | — | (415) 297 0852 | Electricians | Mill Valley · Marin County | — | — |
| Thomas G Johnson DBA J H Mc Farland Co | Thomas Gerard Johnson | — | (415) 328 4374 | Other | San Anselmo · Marin County | — | — |
| Thomas Grant | Thomas Grant | — | (415) 300 7278 | Other | San Rafael · Marin County | — | — |
| Thomas Graves Construction INC | Thomas Walton Graves | — | (415) 568 0458 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Thomas J Collins Construction Co | Thomas James Jr Collins | — | (415) 717 6351 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Thomas Ludlam Construction | Thomas William Ludlam | — | (415) 990 9991 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Thomas Matthew Hogan | Thomas Matthew Hogan | — | (415) 515 9018 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Thomas Morris | Thomas Morris | interested@domainmarket.com | (530) 587 0303 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Thomas Mulvey & Associates Building Contractors Incorporated | Mulvey Thomas | — | (415) 606 2075 | GC, remodel, ADU | Greenbrae · Marin County | — | — |
| Thomas Rank Construction | Thomas Clinton Rank | — | (415) 819 9541 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Thomas Warner Wine Cellars | Thomas Edward Warner | — | (415) 883 8120 | GC, remodel, ADU | Novato · Marin County | — | — |
| Thompson Builders Corporation | Paul Brian Thompson | — | (415) 456 8972 | GC, remodel, ADU | Novato · Marin County | — | — |
| Thompson/core Jv | Builders Corporation Thompson | — | (415) 456 8972 | GC, remodel, ADU | Novato · Marin County | — | — |
| Thompson/focon Jv | INC Focon | — | (415) 456 8972 | GC, remodel, ADU | Novato · Marin County | — | — |
| Thornton Paving INC | Jeffrey Peter Thornton | contact@thorntonpaving.com | (415) 453 2324 | Other | San Rafael · Marin County | — | — |
| Tidy Plumbing INC | Khaled Hossam Mahmo Alkenni | — | (650) 660 7043 | Other | Sausalito · Marin County | — | — |
| Tile Arts INC | Altman Stephen | — | (415) 305 7787 | Other | Fairfax · Marin County | — | — |
| Tile Inspection Services INC | Martin Graham Brookes | martin@tileinspectionservices.com | (415) 383 1489 | Other | Mill Valley · Marin County | — | — |
| Tile Z | Tile Z | — | (415) 758 8453 | Other | Novato · Marin County | — | — |
| Tim Graveson | Tim Graveson | — | (415) 509 4158 | GC, remodel, ADU | Inverness · Marin County | — | — |
| Tim Kerrigan Painting INC | Timothy Mathew Kerrigan | — | (415) 898 4911 | Windows, patio, painters | Novato · Marin County | — | — |
| Tim Tanner Plumbing INC | Timothy Dan Tanner | — | (415) 827 2630 | Other | Inverness · Marin County | — | — |