| Seattle Design Build | CC-01 | 2020 | Active |
| Seattle Drain And Plumbing | CC-01 | 2009 | Active |
| Seattle Eastside Handyman LLC | CC-01 | 2026 | Active |
| Seattle Family Painting | CC-01 | 2019 | Active |
| Seattle Fence And Decks | CC-01 | 2025 | Active |
| Seattle Fix It LLC | CC-01 | 2018 | Active |
| Seattle Flooring Contrs LLC | CC-01 | 2019 | Active |
| Seattle Grounds Management LLC | CC-01 | 2015 | Active |
| Seattle Handyman/Carpentry LLC | CC-01 | 2024 | Active |
| Seattle House Remodeling LLC | CC-01 | 2018 | Active |
| Seattle Marysville Const LLC | CC-01 | 2017 | Active |
| Seattle Masterfix Prcsn Crftsm | CC-01 | 2026 | Active |
| Seattle Mechanical Inc | CC-01 | 2018 | Active |
| Seattle Metropolitan PNTG LLC | CC-01 | 2023 | Active |
| Seattle Mobile Builders LLC | CC-01 | 2019 | Active |
| Seattle Modern Buildings LLC | CC-01 | 2026 | Active |
| Seattle Mudworx LLC | CC-01 | 2006 | Active |
| Seattle Pacific Const Inc | CC-01 | 2012 | Active |
| Seattle Painting Specialists | CC-01 | 2026 | Active |
| Seattle Premium Decks | CC-01 | 2026 | Active |
| Seattle Pros Custom Homes LLC | CC-01 | 2023 | Active |
| Seattle Qlty WP & FNDN RPR LLC | CC-01 | 2026 | Active |
| Seattle Quality Builders LLC | CC-01 | 2024 | Active |
| Seattle Quality Siding LLC | CC-01 | 2025 | Active |
| Seattle Remodel And Design LLC | CC-01 | 2019 | Active |
| Seattle Remodel Management | CC-01 | 2017 | Active |
| Seattle Renovation LLC | CC-01 | 2017 | Renew by Dec 13, 2026 |
| Seattle Repair & Remodel LLC | CC-01 | 2023 | Active |
| Seattle Roof Systems LLC | CC-01 | 2025 | Active |
| Seattle Roofline & Masonry LLC | CC-01 | 2026 | Active |
| Seattle Scandinavian | CC-01 | 2025 | Active |
| Seattle Shower Door LLC | CC-01 | 2018 | Active |
| Seattle Side Sewer LLC | CC-01 | 2023 | Active |
| Seattle Solstice LLC | CC-01 | 2010 | Active |
| Seattle Stratos LLC | CC-01 | 2026 | Active |
| Seattle Suds LLC | CC-01 | 2025 | Active |
| Seattle Tank/Tacoma Tank SVCS | CC-01 | 1999 | Renew by Nov 27, 2026 |
| Seattle Tarp Co Inc | CC-01 | 1985 | Active |
| Seattle Tech Home Sltns LLC | CC-01 | 2026 | Active |
| Seattle Tree Consulting LLC | CC-01 | 2024 | Active |
| Seattle Woodworks LLC | CC-01 | 2017 | Active |
| Seattle-Adu Inc | CC-01 | 2025 | Active |
| Seattledvr Inc | CC-01 | 2021 | Active |
| Seattlehandyman.Biz LLC | CC-01 | 2012 | Active |
| Seaview Boatyard West Inc | CC-01 | 2011 | Active |
| Second Use Building Mtrls Inc | CC-01 | 1999 | Active |
| Secretario Design Build | CC-01 | 2020 | Active |
| Seider Woodworking LLC | CC-01 | 2021 | Active |
| Seismic Shutoff LLC | CC-01 | 2018 | Renew by Nov 18, 2026 |
| Selander Laboratories LLC | CC-01 | 2025 | Active |
| Sellen Constr Co Inc | CC-01 | 1963 | Active |
| Sender Residential | CC-01 | 2025 | Active |
| Sensible Builder LLC | CC-01 | 2013 | Active |
| Sergio Big Maple LLC | CC-01 | 2020 | Active |
| Servata Pro | CC-01 | 2024 | Active |
| Seth Jarreau General Contr LLC | CC-01 | 2023 | Active |
| Setz Construction Inc | CC-01 | 2025 | Active |
| Sevan Locks & Doors | CC-01 | 2016 | Active |
| Sevan Systems | CC-01 | 2025 | Active |
| Seven Hills Design LLC | CC-01 | 2006 | Active |
| SG Construction LLC | CC-01 | 2018 | Active |
| SG Development Group LLC | CC-01 | 2025 | Active |
| SG Site Solutions LLC | CC-01 | 2024 | Active |
| Shack Medicine LLC | CC-01 | 2023 | Active |
| Shea Construction LLC | CC-01 | 2020 | Active |
| Sheahan Const & Consulting LLC | CC-01 | 2020 | Renew by Dec 5, 2026 |
| Sheldrup Building Services Co | CC-01 | 2005 | Active |
| Shoalwater | CC-01 | 2025 | Active |
| Sibville LLC | CC-01 | 2017 | Active |
| Sigietel USA | CC-01 | 2026 | Active |
| Signature Bathroom Rmdlng LLC | CC-01 | 2026 | Active |
| Signature Homes Renovation LLC | CC-01 | 2018 | Active |
| Silver Peak Cntrctng Srvcs LLC | CC-01 | 2010 | Active |
| Sirius-V LLC | CC-01 | 2020 | Active |
| Six Bells LLC | CC-01 | 2022 | Active |
| Six Four LLC | CC-01 | 2026 | Active |
| SK Renovation LLC | CC-01 | 2022 | Active |
| Skanska USA Building Inc | CC-01 | 2002 | Active |
| Sky High Window Cleaning Inc | CC-01 | 2025 | Active |
| Sky Meridian LLC | CC-01 | 2018 | Active |
| Skyway Roofing Service LLC | CC-01 | 2014 | Active |
| SL Const Incorporating LLC | CC-01 | 2023 | Active |
| Sloane Construction LLC | CC-01 | 2016 | Active |
| Small Project Refinishing LLC | CC-01 | 2021 | Active |
| Small Things Considered LLC | CC-01 | 2019 | Active |
| Smith Co LLC | CC-01 | 2021 | Active |
| Sno Valley Process Solutions | CC-01 | 2025 | Active |
| Sodo Builders LLC | CC-01 | 2008 | Renew by Dec 6, 2026 |
| Solberg Construction | CC-01 | 2023 | Active |
| Solid House LLC | CC-01 | 2026 | Active |
| Solid Rebuild | CC-01 | 2010 | Active |
| Solidpoint Homes LLC | CC-01 | 2026 | Active |
| Solidrock Renovation | CC-01 | 2023 | Active |
| Solphos LLC | CC-01 | 2024 | Active |
| Solstice Landscapes NW Inc | CC-01 | 2009 | Active |
| Solterra Global LLC | CC-01 | 2017 | Active |
| Solution & Remodel LLC | CC-01 | 2025 | Active |
| Sound Builders NW LLC | CC-01 | 2019 | Active |
| Sound Building Solutions LLC | CC-01 | 2005 | Active |
| Sound Contracting Group LLC | CC-01 | 2017 | Active |