| Sound Design Build LLC | CC-01 | 2025 | Active |
| Sound Door & Genrl Contrs LLC | CC-01 | 2022 | Renew by Nov 15, 2026 |
| Sound Ecology LLC | CC-01 | 2023 | Active |
| Sound Generations | CC-01 | 2017 | Active |
| Sound Hdymn & Contrtion Srvcs | CC-01 | 2016 | Renew by Dec 26, 2026 |
| Sound Kitchen & Bath LLC | CC-01 | 2014 | Active |
| Sound Locations LLC | CC-01 | 2026 | Active |
| Sound Oil Co | CC-01 | 1984 | Active |
| Sound Painting Solutions LLC | CC-01 | 2012 | Active |
| Sound Seismic LLC | CC-01 | 2017 | Active |
| Sound View Window & Door Inc | CC-01 | 2010 | Active |
| Soundcraft Home Services | CC-01 | 2026 | Active |
| Soundearth Strategies Inc | CC-01 | 2010 | Active |
| South Park Handyman, LLC | CC-01 | 2022 | Active |
| South To NW Services LLC | CC-01 | 2019 | Active |
| South West PLBG & Wtrhtrs LLC | CC-01 | 2020 | Active |
| Space Craft Custom Hms/Rnvtns | CC-01 | 2026 | Active |
| Sparkle Construction LLC | CC-01 | 2011 | Active |
| Sparq Living | CC-01 | 2025 | Active |
| Spartan Builders LLC | CC-01 | 2018 | Active |
| SPD Construction Services LLC | CC-01 | 2017 | Active |
| Specialty Woodwork Inc | CC-01 | 2011 | Active |
| Spike Industries LLC | CC-01 | 2026 | Active |
| Spitzack Enterprises LLC | CC-01 | 2020 | Active |
| Square Dwell LLC | CC-01 | 2014 | Active |
| Ssi Construction | CC-01 | 2016 | Active |
| St Seattle Remodeling LLC | CC-01 | 2025 | Active |
| Stabbert Marine & Indstrl LLC | CC-01 | 2021 | Active |
| Stage 2 FM | CC-01 | 2025 | Active |
| Starducts | CC-01 | 2023 | Active |
| Starlight Remodeling LLC | CC-01 | 2025 | Active |
| State Glass LLC | CC-01 | 2019 | Active |
| Steadfast Facilities MGMT | CC-01 | 2026 | Active |
| Steady Construction LLC | CC-01 | 2015 | Active |
| Steelkorr LLC | CC-01 | 2011 | Active |
| Steffes Construction Inc | CC-01 | 2011 | Active |
| Stellar Construction, LLC | CC-01 | 2025 | Active |
| Stone Soup Gardens LLC | CC-01 | 2012 | Active |
| Storybook Manor LLC | CC-01 | 2011 | Active |
| Straightnail LLC | CC-01 | 2024 | Active |
| Strong Hammer & Brush Inc | CC-01 | 2023 | Active |
| Stronghome Seismic Inc | CC-01 | 2019 | Active |
| STS Remodeling Corp | CC-01 | 2000 | Active |
| Studebaker Installs LLC | CC-01 | 2026 | Active |
| Studio 2x4 Construction LLC | CC-01 | 2026 | Active |
| Studio C Designs LLC | CC-01 | 2016 | Active |
| Sublime Synergies LLC | CC-01 | 2024 | Active |
| Summa Homes Inc | CC-01 | 2008 | Active |
| Summit Const & Dvlpnt Inc | CC-01 | 2026 | Active |
| Summit Development LLC | CC-01 | 2000 | Active |
| Summit Garage Door LLC | CC-01 | 2016 | Active |
| Summit Home Renovation LLC | CC-01 | 2026 | Active |
| Sun Construction Inc | CC-01 | 2019 | Active |
| Sunbreak Homes LLC | CC-01 | 2021 | Active |
| Sunde Builders LLC | CC-01 | 2011 | Active |
| Sunergy Systems Inc. | CC-01 | 2010 | Active |
| Sunlight Remodeling LLC | CC-01 | 2023 | Active |
| Sunrise Northwest LLC | CC-01 | 2025 | Active |
| Sunrise Place Townhomes LLC | CC-01 | 2026 | Active |
| Sunset Hill Construction LLC | CC-01 | 2025 | Active |
| Sunshine Cleaning & PNTG LLC | CC-01 | 2018 | Renew by Nov 26, 2026 |
| Sunwood Construction Co | CC-01 | 1985 | Active |
| Super Appliance Repair LLC | CC-01 | 2022 | Active |
| Super Big Robot LLC | CC-01 | 2025 | Active |
| Super Duper Landscaping LLC | CC-01 | 2026 | Active |
| Supergraphics LLC | CC-01 | 2019 | Active |
| Superior Fire & Electrical LLC | CC-01 | 2019 | Active |
| Superior Remodeling Inc | CC-01 | 1997 | Active |
| Supreme General Cont Inc | CC-01 | 2025 | Active |
| Surface Experts Of Central S | CC-01 | 2023 | Active |
| Surface Solutions Inc | CC-01 | 2002 | Active |
| Sustainable Const & Cnsltg LLC | CC-01 | 2005 | Active |
| Swedish Hardwd FLRS Cntrtg Inc | CC-01 | 2022 | Active |
| Switchback Construction LLC | CC-01 | 2023 | Active |
| Synapse Construction LLC | CC-01 | 2009 | Active |
| T & T Interior Deco. LLC | CC-01 | 2016 | Active |
| T&Son Contractor LLC | CC-01 | 2026 | Active |
| T&T Seattle Inc | CC-01 | 2018 | Active |
| T4 Restoration & Cnslt Ser LLC | CC-01 | 2017 | Active |
| Tac Painting & Cleaning LLC | CC-01 | 2016 | Active |
| Taggart Woodworks LLC | CC-01 | 2015 | Active |
| Talon Enterprise Inc | CC-01 | 1994 | Active |
| Talus 9 Townhomes LLC | CC-01 | 2025 | Active |
| Tam Development LLC | CC-01 | 2007 | Active |
| Tang Real Estate Invst Corp | CC-01 | 2015 | Active |
| Tangent Construction Inc | CC-01 | 1990 | Active |
| Tank Wise LLC | CC-01 | 2000 | Active |
| Tanner Construction LLC | CC-01 | 2008 | Active |
| Taos Builders LLC | CC-01 | 2021 | Active |
| Tappert Homes LLC | CC-01 | 2021 | Active |
| Tara Townsend Home Serv, LLC | CC-01 | 2026 | Active |
| Targa Homes LLC | CC-01 | 2018 | Active |
| Tatley-Grund Inc | CC-01 | 1991 | Active |
| TBH Sterling Inc | CC-01 | 2017 | Active |
| TCP Homes LLC | CC-01 | 2025 | Active |
| Technical Waterproofing Inc | CC-01 | 2001 | Active |
| Tecta America Seattle LLC | CC-01 | 2010 | Active |
| Tek-Line Construction Inc | CC-01 | 2004 | Active |
| Tello General Contractor LLC | CC-01 | 2020 | Active |
| Telmar Development LLC | CC-01 | 2021 | Active |