| Taylors Construction LLC | B + C21 | 1971 | Active |
| Tazej Construction And Maintenance Inc | B | 2026 | Active |
| TCB Development Limited | B | 2022 | Active |
| Team Sky Construction Inc | B + C33 | 2024 | Active |
| Tekton Builders & Design | B | 2023 | Active |
| Telemachus Construction | B | 2017 | Active |
| Tender Loving Construction | B, B2 | 2024 | Active |
| Terra Pacific Construction & Development Inc | A, B | 2024 | Active |
| Tevah Construction | B | 2026 | Active |
| Texture Living Inc | B | 2019 | Active |
| TGC Constructors Inc | B | 2022 | Active |
| The Fix Construction Co | B | 2019 | Active |
| The H Studio | B | 2009 | Active |
| The Help Squad | B | 2023 | Active |
| The I Grace Company Commissioned Private Residences Inc | B | 2003 | Active |
| The LLP Build Group | B | 2025 | Active |
| The Mint Leaf Construction Inc | B | 2014 | Active |
| The Professionals - General Services Inc | B | 2026 | Active |
| The State Property Organization Inc | B | 2026 | Active |
| Three Ramz Co | B | 2026 | Active |
| Tier One Plumbing | B + C16, C36 | 2012 | Active |
| Tim Stivers Inc | B + C20 | 2001 | Active |
| Titanium Plumbing | B + C36 | 2013 | Active |
| Tolteco Construction Services Inc | B | 2017 | Active |
| Tomorrow Development LLC | B | 2026 | Active |
| Ton Voltage Inc | B + C10 | 2023 | Active |
| Tonov Construction Inc | B | 2016 | Active |
| Top Builderz Inc | B | 2025 | Active |
| Top Drawer Construction | B | 1989 | Active |
| Top Family Construction And Remodeling Inc | B | 2023 | Active |
| Top Roofing Inc | B | 2007 | Active |
| Top Star USA Construction Inc | B | 2020 | Active |
| Top View Construction & Renovations Inc | B | 2017 | Active |
| Tor Electric Corp | B + C10 | 2019 | Active |
| Torkian Construction Inc | A, B | 1988 | Active |
| Torres Electric And General Construction | B + C10 | 2023 | Active |
| Total Contour Projects Inc | B | 2006 | Active |
| Total Maintenance Services Inc | B | 2026 | Active |
| Total Service Of America Inc | B + C33 | 1988 | Active |
| Toucan Home Solutions LLC | B + C20 | 2022 | Active |
| Touchstone Developers LLC | B | 2025 | Active |
| Trade Group Construction Inc | B + C10 | 2009 | Active |
| Tramonto Construction Inc | A + HAZ | 2026 | Active |
| Trans Pacific Construction Inc | B + C10 | 2002 | Active |
| Tre Development LLC | B | 2021 | Active |
| Tres General Construction | B | 2022 | Active |
| Triangle Construction Inc | B | 1998 | Active |
| Trianon Builders Inc | B + C9 | 2019 | Active |
| Tricore Plumbing Sewer & Construction | A + C9, C36 | 2026 | Active |
| Tried & True Remodeling | B | 2023 | Active |
| Trinity California Development Inc | B | 2025 | Active |
| Trinity Contracting Concepts Inc | B + C10 | 2015 | Active |
| Tripalink Builders LLC | B | 2024 | Active |
| Triplett Construction | B + D63 | 2019 | Active |
| TRM Plumbing | B + C36 | 1988 | Active |
| Trochez Construction Inc | B | 2022 | Active |
| Trouble Free Skylights Inc | B | 2024 | Active |
| True Craft Construction Inc | B | 2016 | Active |
| True Line La LLC | B | 2005 | Active |
| True Oasis Construction Inc | B | 2026 | Active |
| True South Contractors Inc | B + C9 | 2024 | Active |
| Truebeam Construction LLC | B | 2026 | Active |
| Trujillo's Engineering Contractors Inc | A | 2017 | Active |
| Trumpower Development | B | 2016 | Active |
| Tuh Development Inc | B | 2026 | Active |
| Tulip Remodeling Inc | B | 2019 | Active |
| Tun J G Construction Inc | B + C39 | 2019 | Active |
| Turf Center | B | 2023 | Active |
| Twelve Development Inc | B + C33 | 2020 | Renew by Dec 31, 2026 |
| Two Byrds One Stone LLC | B | 2026 | Active |
| Two Eagles Restoration | B | 2023 | Active |
| Tyh Construction Inc | B | 2024 | Active |
| Tyler Development Corporation | B | 1984 | Active |
| U S Building And Development | B | 1990 | Active |
| Ubcon Inc | B | 2019 | Active |
| Ues Construction | B + C10 | 2024 | Active |
| Ultimate Digital Star | B + C7 | 2018 | Renew by Dec 31, 2026 |
| Unified Building Sciences Inc | B | 1999 | Active |
| Unified Waterproofing Inc | B + C17, C39 | 2013 | Active |
| Union Interior Inc | B | 2025 | Active |
| Unionic Construction Inc | B | 2026 | Active |
| Unique Build Iskandar Construction LLC | B | 2023 | Active |
| Unique Construction & Development Inc | B | 2004 | Active |
| Unique Places Builders Inc | B | 2025 | Active |
| Unistar Construction Inc | B | 2024 | Active |
| United Development Group Inc | B | 2025 | Active |
| United El Segundo Inc | A, B + HAZ | 2011 | Active |
| United Specialized Carpenters | B | 2024 | Renew by Nov 30, 2026 |
| United Steel Fence Company | B + C13 | 1977 | Active |
| Universal Abatement Services Inc | B + ASB, C22 | 1995 | Active |
| Universal Construction Co Inc | B | 1993 | Active |
| Unix Construction Inc | A, B + C12, C51 | 2016 | Active |
| Upbuild Construction | B | 2025 | Active |
| Upgrade Remodeling Inc | B | 2025 | Active |
| Uplift Remodeling | B | 2017 | Active |
| Upright Builders Inc | B + C15 | 2019 | Active |
| Urban Luxury Outdoors Inc | B | 2023 | Active |
| Urban Roofing | B + C27, C39 | 2025 | Active |
| Urbancraft Construction & Renovation Inc | A, B | 2023 | Active |
| US La Construction Inc | B | 2025 | Active |