| Theatre Equipment Construction & Service | Kyle H Conner | — | (707) 974 9115 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Thee Contractors INC | Russell Lester Hempy | — | (510) 484 2727 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Thermotek Services INC | Joseph Charles Tenca | — | (855) 580 7100 | HVAC | Livermore · Alameda County | — | — |
| Thiessen Construction & Engineering LLC | Mark August Schneider | — | (925) 485 7824 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Tho Nguyen | Tho Nguyen | — | (510) 717 9819 | Windows, patio, painters | Union City · Alameda County | — | — |
| Thomas Brett Christensen Floor Installations | Thomas Brett Christensen Floor Installations | — | (510) 329 5194 | Other | Pleasanton · Alameda County | — | — |
| Thomas Edward Klingenbeck | Thomas Edward Klingenbeck | — | (510) 481 1985 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Thomas Electric Company | Thomas Wayne Jr Hurtubise | — | (510) 750 3083 | Electricians | Alameda · Alameda County | — | — |
| Thomas Ho | Thomas Ho | — | (510) 589 4123 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Thomas J K Construction LLC | Andre Ameiq O'neal | — | (510) 300 5080 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Thomas Lei Construction INC | Bin Lei | — | (415) 290 9064 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Thomas Nelson Fowler | Thomas Nelson Fowler | — | (510) 410 6873 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Thomas R Silva General Contractor | Thomas R Silva General Contractor | — | (510) 325 8746 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Thomas Runolfsson | Thomas Runolfsson | — | (510) 228 6558 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Three Alarm Electrical Systems INC | Thomas Mathew Lemmons | — | (925) 499 3200 | Electricians | Livermore · Alameda County | — | — |
| Three Alarm Fire Protection | Thomas Mathew Lemmons | sales@3alarmfp.com | (925) 499 3200 | Electricians | Livermore · Alameda County | — | — |
| Three Colors Corp | Munoz Sanches Librado | — | (408) 903 7976 | Other | Union City · Alameda County | — | — |
| Three Star Demolition & Janitoral INC | Hector Vega | — | (408) 573 7399 | Other | Fremont · Alameda County | — | — |
| Three Way Logistics INC | Brian Kenneth Scherer | — | (408) 748 3929 | Other | Fremont · Alameda County | — | — |
| Thumbs Up Rooter And Plumbing | Thumbs Up Rooter And Plumbing | — | (510) 575 3340 | Other | Oakland · Alameda County | — | — |
| Thunder Bay Electric INC | Ricardo Chavarria | — | (510) 750 0251 | Electricians | Oakland · Alameda County | — | — |
| Tianchong Construction | Zhang Tianchong | — | (510) 761 4061 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tibor's Tile Company | Svraka Tibor | — | (510) 566 9359 | Other | San Leandro · Alameda County | — | — |
| Tier 1 Electrical Services | Troy Daniel Donoghue | — | (510) 685 8154 | Electricians | Livermore · Alameda County | — | — |
| Tigre Firestop & Insulation | Lucatero Javier Ramirez | — | (510) 715 0162 | Other | Hayward · Alameda County | — | — |
| Tile Experts | Adrian Conzatti Martinez | — | (650) 743 6138 | Other | Hayward · Alameda County | — | — |
| Tileimpact INC | Sean Eugene Funston | — | (408) 578 3139 | Other | Fremont · Alameda County | — | — |
| Tim Alberts Bobcat Service INC | Timothy Michael| Alberts Tim Michael Alberts | — | (510) 453 6143 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Tim Little | Tim Little | — | (510) 872 7513 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Tim Wright Electrical Contracting / Tim Wright Building Services | Timothy Paul Wright | — | (510) 547 8286 | Electricians | Oakland · Alameda County | — | — |
| Timber Construction | Gustavo Enrique Portillo | — | (510) 205 8732 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Timeless Builders INC | Naeem Akram | — | (510) 755 0859 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Timing HVAC Company | Zhu Weitian | — | (718) 715 2279 | HVAC | San Leandro · Alameda County | — | — |
| Timothy Jon Stokes | Timothy Jon Stokes | — | (510) 719 4600 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Tinpa Electric INC | Zeng Weiguo | — | (510) 410 4811 | Electricians | Alameda · Alameda County | — | — |
| Tinta Fine Painting | Marco Antonio Gudino Valencia | ntintafinepainting@gmail.com | (510) 359 2094 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Tip Managers Inc. | Edward Zhi Luo | — | (415) 919 2947 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Titan Infrastructure LLC | Panduka Jayanath Marambe | — | (408) 802 9336 | Other | Dublin · Alameda County | — | — |
| Tk & Associates INC | James Gerard Taylor | — | (510) 357 1570 | HVAC | San Leandro · Alameda County | — | — |
| Tk Contracting & Consulting INC | Tina Elizabeth Kirkpatrick | — | (925) 818 5676 | GC, remodel, ADU | San Leandro · Alameda County | — | — |