| T Marshall Associates Ltd DBA T Marshall Electric | Brien Marshall Traynor | — | (925) 734 9999 | Electricians | Dublin · Alameda County | — | — |
| T Mitchell Engineers | T Mitchell Engineers | — | (510) 520 2468 | Other | Oakland · Alameda County | — | — |
| T N T Plumbing Company | Todd Walter Hesse | — | (510) 777 9100 | Other | San Leandro · Alameda County | — | — |
| T P S Electric | Omar Hasen Khalid Almasarwa | administracion@tpselectric.com | (510) 390 2764 | Electricians | Fremont · Alameda County | — | — |
| T R E Construction And Management INC | Paul Sidney Qualls | — | (510) 573 1023 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| T R T Construction Management | Thomas Reed Tripp | — | (510) 495 4879 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| T T M Construction | Minh Thanh Truong | ttmconstruction.com@gmail.com | (510) 944 7750 | GC, remodel, ADU | Mt Eden · Alameda County | — | — |
| T Tran Landscaping | T Tran Landscaping | — | (510) 828 1144 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| T V P C INC | Richard Thomas Villa | — | (510) 712 2138 | Other | Hayward · Alameda County | — | — |
| T V R Electric INC | Victor Manuel Rodriguez-Vazquez | — | (510) 612 2017 | Electricians | Castro Valley · Alameda County | — | — |
| T V T Construction | Thin Van Tran | — | (510) 610 8560 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| T W Construction | Todd Arlie Wiegel | — | (510) 326 1831 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| T W Construction | Sinh Canh On | — | (510) 882 4494 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| T&f Construction | Tam Van Nguyen | — | (510) 590 2040 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| T&m Construction & Electrical | Toan Van Pham | — | (510) 456 8166 | Electricians | Union City · Alameda County | — | — |
| T-electric LLC | Ochtaras Athanasios | — | (510) 359 9452 | Electricians | San Lorenzo · Alameda County | — | — |
| T.e.c. Electrical & Fabrication | T.e.c. Electrical & Fabrication | — | (510) 814-9387 | Electricians | Alameda · Alameda County | — | — |
| Ta Tung Construction INC | Goon Chau Chu | — | (415) 812 6028 | Electricians | Alameda · Alameda County | — | — |
| Tac Building Solutions | Tac Building Solutions | — | (510) 909 3200 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Tacoma Construction INC | Liborio Ronquillo | — | (510) 289 4747 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Tactical Media Integration INC | Ever Enrique Ochoa | — | (510) 575 9902 | Other | Union City · Alameda County | — | — |
| Taein Park | Taein Park | — | (510) 875 5624 | Other | San Leandro · Alameda County | — | — |
| Tag Window Coverings | Tag Window Coverings | — | (650) 208 3566 | Other | Fremont · Alameda County | — | — |
| Tahoe Tile And Stone | Tahoe Tile And Stone | — | (530) 721 5973 | Other | Dublin · Alameda County | — | — |
| Tajuan Remodeling | Hamid Ghasemiyeh | — | (408) 230 0384 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Talai's Electric | Bob B Talai | — | (510) 303 3034 | Electricians | Livermore · Alameda County | — | — |
| Tamps Construction | Banda-izaguirre Raul | — | (510) 938 2628 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Tamura Construction Services INC | Neal Curtis Tamura | — | (415) 915 9361 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tan & Chan Construction Corporation | Hokhung Chan | — | (510) 703 2833 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tan Construction | Tan Arthur | — | (510) 982 6607 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Tan Dinh | Tan Dinh | — | (510) 926 7788 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Tan Q Tang Construction Co | Tan Q Tang | — | (510) 859 5788 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tanev Windows & Doors | Tanev Windows & Doors | — | (415) 595 0492 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Tang's Electric | Tang Zi Chao | — | (510) 386 1728 | Electricians | Castro Valley · Alameda County | — | — |
| Tango Construction | Tuan Anh Ngo | — | (510) 904 7139 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Tankless Plumbing Solutions | Tankless Plumbing Solutions | — | (510) 846 6591 | Other | Alameda · Alameda County | — | — |
| Tano's Construction Company | Almendarez Estanislao | tanosconstructionco@gmail.com | (510) 880 9246 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tao Mechanical Ltd | Justin Lee Swiers | — | (925) 447 5220 | Other | Livermore · Alameda County | — | — |
| Tao Van Phan | Tao Van Phan | — | (510) 755 0625 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Tap - Tite Company | Michael Ellis Jupp | — | (510) 524 9694 | Other | San Lorenzo · Alameda County | — | — |