| T R S Construction | Todd Rowan Schrock | — | (530) 906 9843 | GC, remodel, ADU | Novato · Marin County | — | — |
| T S Builders | T S Builders | — | (415) 246 8032 | GC, remodel, ADU | Novato · Marin County | — | — |
| Tal Roseberry Construction | Tal Garrett Roseberry | — | (707) 480 2843 | GC, remodel, ADU | Tomales · Marin County | — | — |
| Talley Electrical Service | Neal Adrian Talley | — | (415) 720 5057 | Electricians | San Rafael · Marin County | — | — |
| Tamalpa Landscape And Management Co | Steven Edward Wittman | — | (415) 279 8537 | Windows, patio, painters | San Geronimo · Marin County | — | — |
| Tamalpais Construction INC | Jeffrey Glenn Mills | — | (415) 302 5322 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Tamalpais Environmental Consultants | Aaron Michael O'brien | — | (415) 302 4459 | Other | Fairfax · Marin County | — | — |
| Tamalpais Gardens | Tamalpais Gardens | — | (415) 601 0043 | Windows, patio, painters | Corte Madera · Marin County | — | — |
| Tamalpais Harwood Floors | Dermot John Coogan | — | (415) 459 1800 | Other | San Rafael · Marin County | — | — |
| Tamalpais Land Construction | Sodbinow Lidscha | — | (415) 797 2320 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Tamalpais Property Management | Tamalpais Property Management | — | (415) 927-7368 | Property managers | Larkspur · Marin County | — | — |
| Tamcal Builders INC | Andrew Everett Earnhardt | — | (415) 254 1560 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Tamco Construction INC | Michael Victor Josephian | — | (415) 439 3963 | GC, remodel, ADU | Larkspur · Marin County | — | — |
| Tanner Landscaping | Tanner Landscaping | — | (415) 847 2280 | Windows, patio, painters | Novato · Marin County | — | — |
| Tannerbuilt Building & Design | Tannerbuilt Building & Design | — | (415) 328 2831 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Tara Roofing | Eamon Jude Lowth | — | (415) 892 2634 | Other roofers | Novato · Marin County | — | — |
| Tarantino Plumbing INC | Richard Anthony Tarantino | — | (415) 507 1700 | Other | San Rafael · Marin County | — | — |
| Taravella Electric | Jonah Christopher Taravella | — | (415) 235 9677 | Electricians | San Rafael · Marin County | — | — |
| Taub Designs | Taub Designs | — | (415) 858 8872 | GC, remodel, ADU | Novato · Marin County | — | — |
| Taz Demolition | Taz Demolition | — | (707) 529 1410 | Other | San Anselmo · Marin County | — | — |
| Tb42 Contracting | Theodore Harris Bernhard | — | (415) 310 3773 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Tcc Associates INC | Justin Cheyenne Tupper | — | (415) 355 5102 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Team Alist | Harrison Carey Street | — | (415) 895 1778 | Other | Novato · Marin County | — | — |
| Tech Air INC | Colin Jeffrey Hallatt | — | (415) 758 0396 | HVAC | Novato · Marin County | — | — |
| Tech Home INC | Marcos Joseph Alvarez Morga | — | (415) 967 9494 | Electricians | San Rafael · Marin County | — | — |
| Technical Earth | Technical Earth | — | (415) 215 5366 | Electricians | Mill Valley · Marin County | — | — |
| Technics Painting INC | Jorge Daniel Vallejo Paz | — | (415) 377 6380 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Telford Construction INC | Geoffrey Allan Telford | — | (415) 860 1451 | GC, remodel, ADU | Inverness · Marin County | — | — |
| Ten Eyck Homes | Ten Eyck Homes | — | (415) 608 6832 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Teodulo Landscaping | Teodulo Landscaping | — | (707) 343 6684 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Teos Construction | Leon-Valiente Aristeo De | — | (415) 630 0835 | GC, remodel, ADU | Novato · Marin County | — | — |
| Terranova Construction | Romero Barrantes Steven | terranovaservices1@gmail.com | (415) 637 0862 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Terry Mc Daniel Construction | Mc Daniel Terry | info@terrymcdanielconstruction.com | (415) 250 2308 | GC, remodel, ADU | San Quentin · Marin County | — | — |
| Terry Mc Daniel Construction | Terry Claude Mc Daniel | info@terrymcdanielconstruction.com | (415) 306 4528 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Tg General Building Construction INC | Timoteo Gomez-Mendez | — | (415) 845 6138 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| The Christmas Light Pros | The Christmas Light Pros | — | (415) 272 7510 | Electricians | San Anselmo · Marin County | — | — |
| The Clever Home Metal Products | The Clever Home Metal Products | — | (415) 272 9249 | Other | Novato · Marin County | — | — |
| The Construction Connection | O'sullivan Aidan | — | (415) 298 6231 | GC, remodel, ADU | San Geronimo · Marin County | — | — |
| The Cooks' Line INC DBA Alfresco Heating | Marc Eric Kahn | — | (415) 884 2880 | HVAC | Novato · Marin County | — | — |
| The Custom Home Company LLC | Robert Brian Auger | — | (707) 200 3103 | GC, remodel, ADU | Sausalito · Marin County | — | — |