| Webb Craft Home Services LLC | CC-01 | 2026 | Active |
| Weber Design Build LLC | CC-01 | 2015 | Active |
| Wei Develop LLC | CC-01 | 2026 | Active |
| Weigand Const Seattle Inc | CC-01 | 2008 | Active |
| Wesnor Plumbing & Heating LLC | CC-01 | 2019 | Active |
| Wessco Blinds & Interiors | CC-01 | 1998 | Active |
| West Coast Insulation | CC-01 | 2021 | Active |
| West King Construction LLC | CC-01 | 2021 | Active |
| West Ridge LLC | CC-01 | 2011 | Active |
| West Seattle Design Build | CC-01 | 2009 | Active |
| West Seattle Handyman & DSGN | CC-01 | 2022 | Active |
| West Seattle Natrl Energy LLC | CC-01 | 2008 | Active |
| West Seattle Window & Dr LLC | CC-01 | 2013 | Active |
| West Summit GNRL Contrng LLC | CC-01 | 2022 | Active |
| West Waterway Terminals Inc | CC-01 | 2002 | Active |
| Westbank Projects (Us) Corp | CC-01 | 2018 | Active |
| Western Engineering Constr Inc | CC-01 | 1992 | Active |
| Western Exposures Const Inc | CC-01 | 1995 | Active |
| Western Flooring, LLC | CC-01 | 2022 | Active |
| Western Marine Const Inc | CC-01 | 1981 | Active |
| Western Pacific Const LLC | CC-01 | 2024 | Renew by Dec 23, 2026 |
| Westlake Builders LLC | CC-01 | 2022 | Active |
| Westland Associates LLC | CC-01 | 1997 | Active |
| Westmintster LLC | CC-01 | 2002 | Active |
| White Crane Construction LLC | CC-01 | 2024 | Active |
| White Glove Home Improvement | CC-01 | 2024 | Renew by Dec 18, 2026 |
| Wikstrom Services LLC | CC-01 | 2019 | Active |
| Wild Tree Woodworks LLC | CC-01 | 2013 | Active |
| Wilder McKenzie Inc | CC-01 | 2016 | Renew by Dec 1, 2026 |
| Wilkinson Builders LLC | CC-01 | 2013 | Active |
| Wilkinson Painting | CC-01 | 2024 | Active |
| Williamson Landscape Arch LLC | CC-01 | 1995 | Active |
| Willow Street Gardens LLC | CC-01 | 2021 | Active |
| Wilson Miller & Company LLC | CC-01 | 2016 | Active |
| Wilson Miller Mechanical LLC | CC-01 | 2026 | Active |
| Win Design Build LLC | CC-01 | 2020 | Renew by Dec 15, 2026 |
| Window Pros LLC | CC-01 | 2023 | Active |
| Windows Doors & More Inc | CC-01 | 2001 | Active |
| Winfield Homes LLC | CC-01 | 2015 | Active |
| Winn Build & Design LLC | CC-01 | 2020 | Renew by Dec 9, 2026 |
| Wireframe Home | CC-01 | 2019 | Active |
| Wirth LLC | CC-01 | 2014 | Active |
| WM Contractor Holdings LLC | CC-01 | 2021 | Active |
| WM M Yedor Inc | CC-01 | 2000 | Active |
| Wolf General Contractor LLC | CC-01 | 2023 | Active |
| Wolfy's Roofing LLC | CC-01 | 2026 | Active |
| Woodcrafters Construction LLC | CC-01 | 2006 | Active |
| Woodgreen Custom Built LLC | CC-01 | 2023 | Active |
| Workbench Building + DSGN LLC | CC-01 | 2012 | Active |
| Worldview Group LLC | CC-01 | 2022 | Renew by Nov 19, 2026 |
| Wsea Construction | CC-01 | 2025 | Active |
| Wwaavvee | CC-01 | 2025 | Active |
| Wygal Builders LLC | CC-01 | 2015 | Active |
| Wylie Painting & Const Inc | CC-01 | 2011 | Active |
| Wylie's Reliable Services LLC | CC-01 | 2023 | Active |
| X Services Inc | CC-01 | 2026 | Active |
| Xi General Contractor LLC | CC-01 | 2025 | Active |
| Xi Shu LLC | CC-01 | 2015 | Active |
| XL Builders LLC | CC-01 | 2022 | Active |
| Y B Tubless | CC-01 | 1992 | Active |
| Yarson LLC | CC-01 | 2024 | Renew by Dec 26, 2026 |
| Yijia Remodeling LLC | CC-01 | 2025 | Active |
| Yogi Jones Prprt CLNG Co LLC | CC-01 | 2025 | Active |
| Yokel Builds LLC | CC-01 | 2023 | Active |
| You Know The Drill LLC | CC-01 | 2026 | Active |
| Your Home Builders Inc | CC-01 | 2022 | Active |
| Your Seattle Handyman | CC-01 | 2026 | Active |
| Yousifzai Property Sltns LLC | CC-01 | 2026 | Active |
| Zaytura LLC | CC-01 | 2024 | Renew by Dec 5, 2026 |
| Zazuri Construction LLC | CC-01 | 2026 | Active |
| Zeitgeist Art Logistics LLC | CC-01 | 2024 | Active |
| Zenith Roofing/Contracting LLC | CC-01 | 2009 | Active |
| Zenzia | CC-01 | 2026 | Active |
| Zephyr Construction | CC-01 | 2025 | Active |
| Zephyr Prstn Const & Wdwrk LLC | CC-01 | 2020 | Renew by Dec 4, 2026 |
| Zhen's Construction Inc | CC-01 | 2010 | Active |
| Zip Mechanical | CC-01 | 2016 | Active |
| Zuma Contracting Services LLC | CC-01 | 2020 | Active |