| Two Z Inc | B | 2026 | Active |
| Tycon Builders Inc | B | 1996 | Active |
| U A Hotels Construction Inc | B | 1995 | Active |
| U M B Corporation | B | 1991 | Active |
| U T E C Construction Company Inc | A, B | 2015 | Active |
| Umlaut Interiors LLC | B | 2017 | Active |
| Union Pierce Construction | B | 2012 | Renew by Dec 31, 2026 |
| United Builder Group LLC | B | 2026 | Active |
| United California Access & Security | B + C7, C10, C13 +3 | 2008 | Active |
| United California Glass & Door | B + C7, C10, C13 +5 | 1991 | Active |
| United Painting & Construction Inc | B + C33 | 2007 | Active |
| United Plumbing & Construction Inc | B + C36 | 2008 | Active |
| United Safe Inc | B | 1989 | Active |
| Urban 49 Inc | B + C10 | 1995 | Active |
| Urban Bay Engineering | A | 2025 | Active |
| Urban Builder General Contracting Inc | B | 2005 | Active |
| Urban West Construction Inc | A, B | 2011 | Active |
| Urbnbuild Inc | B | 2018 | Renew by Nov 30, 2026 |
| Urrutia's Construction | B | 2023 | Active |
| Urruticochea Construction | B | 2022 | Active |
| US General Builders LLC | B | 2023 | Active |
| Utting Ewen Inc | B | 2001 | Active |
| V B E Inc | A | 2009 | Active |
| V L Construction | B | 2017 | Active |
| Valhalla Construction Co Inc | B | 2019 | Active |
| Van Construction | B | 2021 | Active |
| Velero Inc | B | 2016 | Active |
| Velic Construction Inc | B | 2018 | Active |
| Velox Design And Construction Inc | B | 2019 | Active |
| Vencon Construction | B + C6, D28 | 2022 | Active |
| Ventelo Management | B | 1998 | Active |
| Vida Construction Inc | B | 2023 | Active |
| Villa Technologies Inc | B + C47 | 2021 | Active |
| Vintage Contractors Inc | A + C12, C13, C39 | 1981 | Active |
| Vitality Remodeling LLC | B2 | 2025 | Active |
| Vivid Art Construction Inc | B | 2021 | Active |
| Vsa Construction | B + C10, C39 | 2014 | Active |
| VT Construction And Remodeling | B | 2018 | Renew by Nov 30, 2026 |
| W C House Service Inc | B | 2019 | Active |
| W Factor Construction Inc | B + C54 | 2011 | Active |
| W H Construction Inc | B | 2012 | Active |
| W H Sam Construction Inc | B | 2015 | Active |
| W J L Construction Inc | B | 2000 | Active |
| W L Construction Group | B | 2018 | Active |
| W N C Construction Inc | B | 2017 | Active |
| Ward Tony Construction Inc | B | 2005 | Active |
| Waters Brendan Construction Inc | B | 2004 | Active |
| Watertight Restoration Inc | A, B + C29, C33, C39 +1 | 1979 | Active |
| WCSS Construction | B + C15, D28 | 2014 | Active |
| WD Fire Protection Group JV | B + C7, C10, C36 | 2026 | Active |
| WD Fire Protection Inc | B + C16, C36 | 2023 | Active |
| We Do Construction Inc | B + C36 | 2022 | Active |
| Webb Kevin Construction Inc | B | 1984 | Active |
| Webcor Roberts Obayashi JV | A, B + C8, C9 | 2021 | Active |
| Wellington H R Construction Inc | B | 1991 | Active |
| Wen Construction Inc | B | 2024 | Renew by Dec 31, 2026 |
| West Beam Construction LLC | B | 2022 | Active |
| West Coast Excavations, Inc. | A | 2023 | Active |
| West Coast Property Maintenance Co | B | 2004 | Active |
| West-Tech General Engineer And Builder | A, B | 2024 | Active |
| Westek Builders | B + C10 | 2021 | Active |
| Westland Contractors Inc | A | 2016 | Active |
| Westrock Engineering | A | 2024 | Active |
| Wickman Development And Construction | A, B | 2012 | Active |
| Williams Construction Inc | B | 2002 | Active |
| Winder Construction Inc | B | 2017 | Active |
| Window Replacement Center | B + C17 | 2016 | Active |
| Winedark Inc | B | 2016 | Active |
| Winko Design & Construction Inc | B | 2026 | Active |
| Winwin Construction Inc | B | 2017 | Active |
| Wong Alex Construction Inc | B | 2021 | Active |
| Wong Wah Construction Inc | B | 2017 | Active |
| Woo John Construction Corporation | B | 1999 | Active |
| Wood Inc | B | 2023 | Active |
| Woodbrook Incorporated | B + C33 | 2012 | Active |
| Workcraft Construction Inc | B | 2015 | Active |
| WTH Construction Inc | B | 2014 | Active |
| Wu Gordon Homes Incorporated | B | 2024 | Active |
| WW Electric And Construction Inc | B + C10 | 2024 | Active |
| Xin Xin Construction Inc | B | 2005 | Active |
| Xing Construction Inc | B + C54 | 2012 | Active |
| Xinrong Construction Inc | B | 2026 | Active |
| Xponential Construction Co | B | 2025 | Active |
| Xspace Builders Inc | B | 2020 | Active |
| Y K Mason & Sons Inc | B + D39 | 2015 | Active |
| Y L Construction Inc | B | 2018 | Active |
| Y W Builders Inc | B | 2017 | Active |
| Y&G Construction Inc | B | 2021 | Active |
| Yao Star Construction Inc | B | 2012 | Active |
| Yefa Construction Inc | A, B + C10 | 2018 | Renew by Dec 31, 2026 |
| Yellowstone Construction Professionals LLC | B + C10 | 2022 | Active |
| Yerba Buena Builders Inc | B | 1996 | Active |
| Yerba Buena Engineering & Construction Inc | A, B + ASB, HAZ | 1992 | Active |
| Yet Flat Construction LLC | B | 1999 | Active |
| Yi Da Construction | B | 2025 | Active |
| Yick Robert Company Inc | B + C20, C43 | 1969 | Active |
| Yjw Construction Inc | B | 2025 | Active |
| Yong And Zhuo Construction Inc | B | 2014 | Renew by Dec 31, 2026 |
| Youda Builders Inc | B + C10, C36 | 2015 | Active |
| Ywum Enterprise Inc | B | 2006 | Active |