| Tri County Electric INC | Tad Daniel Weathers | colleen@tricountyelectric.com | (707) 477 1397 | Electricians | Rohnert Park · Sonoma County | — | — |
| Tri-county Concrete Pumping | Nicole Lynnae Grove | — | (707) 568 7525 | Other | Santa Rosa · Sonoma County | — | — |
| Tri-county Heating And Sheet Metal INC | Judith M Olmstead | — | (707) 763 2649 | HVAC | Petaluma · Sonoma County | — | — |
| Trick Construction | Edward John Trick | — | (707) 228 7577 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Trident Electric | Darin Mathew Begley | — | (707) 235 7106 | Electricians | Forestville · Sonoma County | — | — |
| Trimline Paint & Decorating | Trimline Paint & Decorating | — | (415) 250 8580 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Trimyc Mechanical INC | Casey Michael Rogina | — | (707) 664 1042 | HVAC | Cotati · Sonoma County | — | — |
| Trinity Construction | Denise Renee Palmer | interested@domainmarket.com | (707) 585 2959 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Trinity Oaks Remodeling INC | John Robert Ocallaghan | — | (707) 484 6921 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Trino's Concrete Services | Trinidad Garcia Azanza | — | (707) 480 0970 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Triolo Electric INC | Samuel Simion Precup | contact@trioloelectric.com | (707) 327 8866 | Electricians | Santa Rosa · Sonoma County | — | — |
| Trl Builders INC | Thomas Richard Lovold | — | (707) 293 6034 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Trombino Electric | Joseph Allen Trombino | — | (707) 481 6924 | Electricians | Santa Rosa · Sonoma County | — | — |
| Trope Group INC | Cameron Allan Ramos | info@tropegroup.com | (707) 546 8181 | Other | Santa Rosa · Sonoma County | — | — |
| Tropicana Pools Of California | Michael Corcoran Nielsen | — | (707) 332 1826 | Pool | Petaluma · Sonoma County | — | — |
| Troy H Maher | Troy H Maher | — | (707) 481 8152 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| True Colors Professional Painting | True Colors Professional Painting | — | (707) 318 8822 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| True North | True North | — | (707) 494 5094 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| True North Signs & Graphic Services | Thomas Randolph Pforsich | — | (707) 526 1908 | Other | Santa Rosa · Sonoma County | — | — |
| True Tone Painting INC | Vincent Joseph Smith | hello@rfuenzalida.com | (707) 972 1199 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Truecraft Flooring | Truecraft Flooring | — | (707) 360 7416 | Other | Santa Rosa · Sonoma County | — | — |
| Truevine Custom Concrete | Truevine Custom Concrete | — | (707) 934 5840 | Other | Sonoma · Sonoma County | — | — |
| Trugrade Construction | Josh Galusha | — | (707) 843 3426 | Other | Santa Rosa · Sonoma County | — | — |
| Tsarnas Drywall INC | John Baker Tsarnas | — | (707) 431 1018 | Other | Healdsburg · Sonoma County | — | — |
| Tucker Electrical | Stephen Ray Tucker | — | (707) 591 3799 | Electricians | Sebastopol · Sonoma County | — | — |
| Tucker Tile | Tucker Tile | nick@tuckertile.com | (707) 495 2473 | Other | Sebastopol · Sonoma County | — | — |
| Turbo Garage Door INC | Kahlani Ohad | — | (707) 800 9635 | Other | Santa Rosa · Sonoma County | — | — |
| Turn - Key Renovations | Turn - Key Renovations | — | (707) 548 9498 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Turner & Taylor Metal Works INC | Ethan Hamlin Turner | — | (415) 883 8059 | Other | Petaluma · Sonoma County | — | — |
| Turner Construction | Patrick Brian Turner | — | (707) 484 6074 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Tw Flooring | Tw Flooring | — | (707) 322 5751 | Other | Cloverdale · Sonoma County | — | — |
| Twentyfour / Seven Construction Company | Michael Jason Rasmussen | — | (707) 206 2103 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Two Brothers Finish Carpentry INC | Gonzalez Francisco Maciel | — | (707) 529 7516 | Other | Santa Rosa · Sonoma County | — | — |
| Two Crows Construction | Simon Peter Farmer | — | (707) 861 1199 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Two Rock Construction INC | Brady Benjamin Schalich | — | (415) 328 2540 | GC, remodel, ADU | Occidental · Sonoma County | — | — |
| Two Sisters Construction | Nancy Eddinger Madarus | — | (707) 484 3244 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Tyler Elliff | Tyler Elliff | — | (707) 239 0658 | Other | Windsor · Sonoma County | — | — |
| Tyler Norris Construction LLC | Tyler Edward Norris | — | (707) 761 5882 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Tyne Electric | James Dale Quinn | — | (707) 799 3236 | Electricians | Santa Rosa · Sonoma County | — | — |
| U S Traffic Control West LLC | Joseph Ian Ulm | — | (706) 369 5300 | Other | Petaluma · Sonoma County | — | — |