| KG Painting & Construction LLC | RGC | 2026 | Active |
| KHC General Contractor LLC | CGC2, RGC | 2009 | Active |
| King West Inc | RGC | 2013 | Active |
| Kings Building LLC | CGC2, RGC | 2008 | Active |
| Kiryuta Construction LLC | RGC | 2021 | Active |
| KK Excavation LLC | RGC | 2025 | Active |
| Klocksieben Construction LLC | RGC | 2021 | Active |
| Km3 Contractors LLC | RGC | 2024 | Active |
| KNM LLC | RGC | 2023 | Active |
| Knoll Craft & Contracting LLC | RGC | 2026 | Active |
| Knuth Construction LLC | RGC | 2019 | Active |
| Kodiak Electric LLC | RGC | 2004 | Active |
| Koenig & Copper LLC | RGC | 2026 | Active |
| Koonce Design LLC | RGC | 2026 | Active |
| Koumentis Construction LLC | RGC | 2022 | Active |
| Kraft Custom Construction Inc | RGC | 2010 | Active |
| Kreitzberg Home LLC | RGC | 2020 | Active |
| Kropf Construction Inc | CGC2, RGC | 1992 | Active |
| KT Contracting Co Inc | CGC2 | 1993 | Active |
| Kuhlman Enterprises Inc | CGC2, RGC | 1997 | Active |
| Kyle & Sons Excavation LLC | RGC | 2023 | Active |
| Kyle C Koontz Construction LLC | RGC | 2014 | Active |
| Kyle Lincicome Construction Inc | RGC | 2026 | Active |
| L & G Property Management LLC | RGC | 2020 | Renew by Dec 10, 2026 |
| Lakeside Construction Co LLC | RGC | 2022 | Active |
| Lakeside Premium Construction LLC | RGC | 2024 | Active |
| Lakewood Landscape & Construction LLC | RGC | 2022 | Active |
| Lantern Contracting LLC | RGC | 2020 | Active |
| Lashmett Remodel And Tile LLC | RGC | 2010 | Active |
| Last Drop General Contractor LLC | CGC2, RGC | 2024 | Active |
| Laudette Construction & Maintenance Inc | RGC | 2010 | Active |
| Left Coast Door & Glass LLC | RGC | 2018 | Active |
| Leftco Incorporated | CGC2, RGC | 2016 | Active |
| Legacy Builders And Remodeling LLC | RGC | 2026 | Active |
| Legacy Construction & Restoration LLC | CGC2, RGC | 2016 | Renew by Dec 5, 2026 |
| Legends 4 Construction LLC | CGC2, RGC | 2025 | Active |
| Leighs Construction Co LLC | RGC | 2011 | Active |
| Lemin Group LLC | RGC | 2024 | Active |
| Leon General Construction LLC | RGC | 2026 | Active |
| Lerud & Son Inc | RGC | 1986 | Active |
| Leupitz Contractors Inc | RGC | 2013 | Active |
| Lfi Corporation | RGC | 2014 | Active |
| Lg&J Construction LLC | RGC | 2023 | Active |
| Liberty Homes Construction LLC | CGC2, RGC | 2015 | Active |
| Lindsays Painting & Design LLC | RGC | 2006 | Active |
| Lineage Legacy LLC | RGC | 2025 | Active |
| Liquid Painting LLC | RGC | 2017 | Active |
| Lme Concrete LLC | RGC | 2021 | Active |
| Louthan Custom Construction LLC | RGC | 2025 | Active |
| Low Voltage NW LLC | CGC2 | 2015 | Active |
| LP Company Inc | CGC1 | 1972 | Active |
| Lucianos Floor Covering LLC | CGC2, RGC | 2017 | Active |
| Lumar Builders LLC | CGC2, RGC | 2021 | Active |
| Luminations LLC | RGC | 2025 | Active |
| Lunt Contracting LLC | RGC | 2019 | Active |
| Luxury Tile LLC | RGC | 2021 | Active |
| Lyth Tree Service LLC | RGC | 2024 | Active |
| M & A Contracting Inc | CGC2 | 2007 | Active |
| M & C Premium Roofing LLC | RGC | 2025 | Active |
| M & F Nunez General Construction LLC | RGC | 2016 | Active |
| M & I General Construction LLC | RGC | 2016 | Active |
| M & S General Contractors & Remodeling LLC | CGC2, RGC | 2012 | Active |
| M J Baker Inc | CGC2, RGC | 2003 | Active |
| Mack Drilling Co Inc | CGC2, RGC | 1995 | Active |
| Made Nice General Contracting LLC | RGC | 2026 | Active |
| Mainline Construction LLC | RGC | 2025 | Active |
| Marcano Roofing LLC | RGC | 2017 | Active |
| Mark Dettwyler Construction LLC | RGC | 2026 | Active |
| Mark Rodli & Associates LLC | RGC | 2021 | Active |
| Marodriguez Construction LLC | RGC | 2023 | Active |
| Martian Construction LLC | RGC | 2010 | Active |
| Martin Construction Group LLC | RGC | 2024 | Renew by Nov 6, 2026 |
| Martin Metal Fabricators Inc | CGC1, RGC | 2000 | Active |
| Martinez Drywall Solutions LLC | RGC | 2021 | Active |
| Martinez Fam Builders LLC | RGC | 2022 | Active |
| Marvelous Renovations LLC | RGC | 2025 | Active |
| Master Of Flooring & Carpet LLC | RGC | 2023 | Active |
| Master Roof LLC | RGC | 2025 | Active |
| Master Temperature Heating & Cooling JSP Construction LLC | RGC | 2023 | Active |
| Masterpiece Improvements LLC | RGC | 2025 | Active |
| Masters Flooring & Custom Tile LLC | RGC | 2021 | Active |
| Matamoros Construction LLC | RGC | 2024 | Active |
| Matrix Construction Inc | RGC | 2026 | Active |
| Matrix Contracting LLC | CGC2, RGC | 2017 | Active |
| Matt Sears Construction LLC | RGC | 2022 | Active |
| MC Mechanical LLC | CGC2 | 2024 | Active |
| McCallister Concrete & Excavation LLC | RGC | 2016 | Active |
| McCaw Construction LLC | RGC | 2021 | Active |
| McI Construction LLC | RGC | 2026 | Active |
| McMullen & Sons Construction LLC | RGC | 2017 | Active |
| MD Painting & General Construction LLC | RGC | 2017 | Active |
| MDT Construction Group LLC | CGC2, RGC | 2020 | Active |
| Mega Hands Roofing LLC | RGC | 2024 | Active |
| Mejia Painting & Home Improvement LLC | RGC | 2025 | Active |
| Melco Excavating LLC | RGC | 2014 | Active |
| Men Pro Painting LLC | RGC | 2019 | Active |
| Mendez Home Improvements LLC | RGC | 2021 | Active |
| Mendoza & Son Construction LLC | RGC | 2020 | Active |
| Mendoza Artscapes And Maintenance LLC | RGC | 2025 | Active |
| Merc Works LLC | RGC | 2024 | Active |