| True Builders | Quyen Duy Ho | — | (510) 876 6399 | GC, remodel, ADU | Union City · Alameda County | — | — |
| True Building Construction INC | Alvarado Moreno Javier | — | (510) 284 7786 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| True Craft Remodeling | True Craft Remodeling | — | (510) 714 4114 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| True Grit Remodel | True Grit Remodel | thatstruegrit@gmail.com | (805) 403 2641 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| True Oak Construction | Nicholas Christopher Cunningham | — | (510) 283 4494 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| True Renewable Energy Incorporated | Sayed Mansoor Hashimi | — | (800) 385 1201 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| True Vue | True Vue | — | (925) 373 1200 | Other | Livermore · Alameda County | — | — |
| Trueform Construction | Isai Eduardo Larios Ortega | — | (916) 793 4089 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Trung Hoang Landscaping | Jimmy Ho | — | (925) 577 7117 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Truong Construction Corporation | Yen Thanh Si Ho | — | (510) 491 4631 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Tryco Electric INC | Thomas Richard Yeomans | — | (925) 833 1033 | Electricians | Hayward · Alameda County | — | — |
| Ts Construction | Todd Allen Swalley | — | (925) 766 6988 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Tse Construction | Jerry Kin Tse | info@tseconstruction.com | (510) 812 3466 | Electricians | San Leandro · Alameda County | — | — |
| Tsomo Construction INC | Batsuuri Bor | — | (415) 786 2102 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Tsui Design And Research | Tsui Eugene | — | (510) 301 2105 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Tt Construction | Thao Van Tran | — | (510) 432 4660 | Electricians | Hayward · Alameda County | — | — |
| Tucker Technology INC | Frank Andrew Tucker | — | (510) 836 0422 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Tucknott Electric Co | Robert Allen Tucknott | — | (925) 931 0800 | Electricians | Livermore · Alameda County | — | — |
| Tulum Innovative Engineering INC DBA Tulum Systems | Henry Richard Vila | — | (510) 689 2763 | Electricians | Oakland · Alameda County | — | — |
| Tulum Nvc Jv | Innovative Engineering INC Tulum | — | (510) 689 2763 | Electricians | Oakland · Alameda County | — | — |
| Turf World Installations LLC | Jason Daniel Thomas | — | (510) 925 7438 | Other | San Leandro · Alameda County | — | — |
| Turner Finish Carpentry | Turner Finish Carpentry | — | (925) 786 3345 | Other | Pleasanton · Alameda County | — | — |
| Turner Group Construction | Fred M Mackay | — | (510) 719 4087 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Turnkey HVAC | Daniel Wong | — | (510) 299 9875 | HVAC | Hayward · Alameda County | — | — |
| Turul Painting Incorporation | Jozsef Varga | — | (408) 595 1335 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Tvt Landscaping | Tvt Landscaping | — | (408) 510 2216 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Twa Properties | Twa Properties | — | (510) 521-3385 | Property managers | Alameda · Alameda County | — | — |
| Twc Global INC | Ken K Tsang | — | (925) 373 7888 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Twin Arrows LP | Thomas John Salas | — | (510) 682 5809 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Twin Brothers Construction INC | Jorge Israel Diaz Lopez | — | (510) 575 1392 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Twin Post Painting | Miguel Angel Sr Fuentes Santiago | — | (510) 361 8924 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Twin Rivers Professional Tree Care INC | Jose Blas Rios Silva | — | (408) 613 4497 | Tree | Hayward · Alameda County | — | — |
| Twins Construction | Ricardo Reyes Carmona | — | (925) 525 7552 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Twintile LLC | Lucas John Riggs | — | (925) 393 3045 | Other | Fremont · Alameda County | — | — |
| Twisted A V | Twisted A V | administrator@twisitedav.com | (510) 635 2495 | Electricians | Oakland · Alameda County | — | — |
| Two Brothers Roofing INC | Jason Robert Broom | — | (510) 537 8015 | Other roofers | Castro Valley · Alameda County | — | — |
| Two14 Construction INC | Arnold Calvin Armstrong | — | (510) 967 4201 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Ty International INC | Trung Quang Ho | interested@domainmarket.com | (510) 754 5440 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Tyler Britt | Tyler Britt | — | (831) 801 5881 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Type Five INC | Aleksis Ehrlich Bertoni | info@typefive.com | (510) 380-7500 | GC, remodel, ADU | Berkeley · Alameda County | — | — |