| Technoair HVAC Services | Ezzat Magdy Ibrahim | — | (925) 580 9999 | HVAC | Martinez · Contra Costa County | — | — |
| Technology Infrastructure Consultants Group INC | Dale Allen Myer | — | (925) 685 5425 | Electricians | Concord · Contra Costa County | — | — |
| Techsmith Electric LLC | Neal Armstrong Smith | — | (925) 768 4964 | Electricians | Pittsburg · Contra Costa County | — | — |
| Ted E Young & Son | Ted E Young & Son | — | (925) 260 4472 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Tek Tile Stone INC | Dan Charles Blume | — | (925) 286 3713 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Telecom Steel LLC | Heather Lynn Borst | — | (847) 525 3960 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Temperature Technology Incorporated | Penelope Lee Mulholland | — | (925) 548 6299 | HVAC | Pacheco · Contra Costa County | — | — |
| Terra Nova Engineering INC | Mirko Yovanovich | — | (510) 524 1220 | Other | Richmond · Contra Costa County | — | — |
| Terra Nova Industries | Ronald Lee Taylor | — | (925) 934 6133 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Terra Nova Project Development Services INC | Ronald Lee Taylor | — | (925) 934 6133 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Terra Vista Landscape | Jarillo Jorge Venegas | — | (925) 238 5899 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Terraform Underground PC | Frank Ray Peacock | terraformunderground@gmail.com | (925) 595 1270 | Other | Discovery Bay · Contra Costa County | — | — |
| Terrasur Corporation | Alfredo Manir Musa | — | (510) 453 3918 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Terry Polk Plumbing | Terry Polk Plumbing | — | (925) 427 1207 | Other | Pittsburg · Contra Costa County | — | — |
| Terry Ronchetto Woodwork & Design | Terry Ronchetto Woodwork & Design | — | (925) 202 9632 | Other | Danville · Contra Costa County | — | — |
| Terry's Tree Service | Terry's Tree Service | — | (925) 820-8733 | Tree | Danville · Contra Costa County | — | — |
| Teverbaugh Drilling | Teverbaugh Drilling | — | (925) 408 9504 | Other | Pleasant Hill · Contra Costa County | — | — |
| Teviotdale | Timothy Luke Riley | — | (510) 304 4825 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Tg Electric INC | Timoteo Herasto Gomez Tevalan | — | (415) 632 0197 | Electricians | Richmond · Contra Costa County | — | — |
| Tger Construction Company | Kelvin Yetchi Tse | — | (925) 542 6406 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Th Norton Landscape Architecture INC DBA Th Norton Construction | Thomas Henry Norton | — | (949) 533 3907 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Thao Hardwood Floors | Thao Hardwood Floors | — | (510) 812 6870 | Other | El Sobrante · Contra Costa County | — | — |
| The Alcazar Plumbing Company | Zavala Alcazar Antonio | — | (510) 776 5319 | Other | Richmond · Contra Costa County | — | — |
| The Ambrose Group INC | Jonathan Ryan Ambrose | — | (925) 385 8055 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| The Art Of Blinds An Window Covering | Sharvit Yoav | — | (925) 457 0810 | Other | Walnut Creek · Contra Costa County | — | — |
| The Ascott Company | Scott Griffin Finley | — | (925) 383 5171 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| The Auger Group INC DBA Clearwater Group | James Alan Jacobs | — | (510) 307 9943 | GC, remodel, ADU | Point Richmond · Contra Costa County | — | — |
| The Bay Area's Best Handyman | The Bay Area's Best Handyman | — | (510) 258 8854 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| The Bay Electric | Jimenez Lugo Gerardo | bayview@bayelectric.com | (510) 366 9314 | Electricians | Antioch · Contra Costa County | — | — |
| The Bay's Brush | The Bay's Brush | — | (510) 620 4043 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| The Best Choice Company | Alma Del Carmen Soto | — | (925) 206 6301 | Other | Oakley · Contra Costa County | — | — |
| The Blueprint Construction INC | Denny Khamsai Lotakoon | — | (510) 712 4896 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| The Clean Sweep | The Clean Sweep | — | (925) 828 1881 | Other | Knightsen · Contra Costa County | — | — |
| The Concrete Master | The Concrete Master | interested@domainmarket.com | (510) 684 8629 | Other | Richmond · Contra Costa County | — | — |
| The Concrete Of God | Eduardo Luis Guzman Norio | — | (510) 838 6483 | Other | Richmond · Contra Costa County | — | — |
| The Edge Painting | The Edge Painting | — | (925) 525 9937 | Windows, patio, painters | Clayton · Contra Costa County | — | — |
| The Expert Gate Company LLC | Israel Leitner | — | (347) 777 8177 | Other | Concord · Contra Costa County | — | — |
| The Expert Roofing Company | Moshe Spiewak | — | (510) 606 0211 | Other roofers | Concord · Contra Costa County | — | — |
| The Finishing Touch | The Finishing Touch | — | (510) 685 7243 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| The Finishing Touch | The Finishing Touch | — | (925) 783 6404 | Other | Antioch · Contra Costa County | — | — |