| Legacy Stoneworks Inc | RGC | 2025 | Active |
| Legum Incorporated | RGC | 2004 | Active |
| Lemon Shark LLC | RGC + LBPR | 2026 | Active |
| Lets Inc | RGC | 2019 | Active |
| LG Myers Construction LLC | RGC | 2014 | Active |
| Liberty Remodelers LLC | RGC + LBPR | 2010 | Active |
| Life Design Build LLC | CGC2, RGC | 2022 | Active |
| Lighthouse Construction LLC | RGC | 1999 | Active |
| Lindustries Inc | CGC2, RGC | 2023 | Active |
| Linnius LLC | CGC2, RGC + LBPR | 2017 | Active |
| Liquid Rock Concrete LLC | RGC | 2014 | Active |
| Little Bear Contracting LLC | RGC | 2024 | Renew by Dec 11, 2026 |
| Live Rock LLC | RGC | 2007 | Active |
| LL Graham Construction LLC | RGC | 2026 | Active |
| LND Build LLC | RGC | 2024 | Active |
| Long Butte Home & Haul LLC | RGC | 2026 | Active |
| Long Construction And Development LLC | RGC | 2026 | Active |
| Loveland Painting And Remodeling LLC | RGC | 2020 | Renew by Dec 28, 2026 |
| Lovering Creative LLC | RGC + LBPR | 2020 | Active |
| Lozano Construction LLC | RGC | 2026 | Active |
| LP Quality Construction LLC | RGC | 2020 | Active |
| LT Northwest Builders LLC | RGC | 2021 | Active |
| Lucky Construction & Renovation Inc | RGC | 2017 | Active |
| Luma Vista Investments Inc | RGC | 1989 | Active |
| Lumiora LLC | RGC | 2026 | Active |
| Luxe Homes LLC | RGC | 2023 | Active |
| LV Silver LLC | RGC | 2019 | Active |
| M2lr Inc | RGC | 2019 | Active |
| Machete Design LLC | RGC | 2026 | Active |
| Made Clean By Mariana LLC | RGC | 2025 | Active |
| Made To Order Woodworks LLC | RGC | 2014 | Active |
| Madrone Construction LLC | RGC | 2010 | Renew by Nov 2, 2026 |
| Magic Walls LLC | RGC | 2025 | Active |
| Magnus Construction LLC | RGC | 2025 | Active |
| Mahler Homes LLC | RGC | 2004 | Active |
| Make Ready Fast LLC | RGC | 2025 | Active |
| Makena Custom Homes Inc | RGC | 2004 | Renew by Dec 30, 2026 |
| Malace Homes LLC | RGC | 2015 | Active |
| Manup Handyman Services LLC | RGC | 2019 | Active |
| Maple Ridge Contracting LLC | RGC | 2024 | Active |
| Mapleleaf Woodworking & Contracting Inc | RGC | 1995 | Active |
| Margo Construction LLC | RGC | 2007 | Active |
| Marin Development Inc | RGC | 2009 | Active |
| Mark Latham Excavation Inc | CGC1, RGC | 1988 | Active |
| Martinez Builders LLC | RGC | 2025 | Active |
| Martinez Construction & Services LLC | RGC | 2016 | Active |
| Martinez Construction Co LLC | RGC | 2013 | Active |
| Masters Of Disaster LLC | RGC + LBPR | 2021 | Active |
| Masters Touch Air Duct Cleaning LLC | RGC | 2012 | Active |
| Matthew W Klar Construction LLC | RGC | 2026 | Active |
| Matthews Fine Woodworks LLC | RGC | 2022 | Active |
| Matzke Designs LLC | RGC | 2020 | Active |
| Maven Builders LLC | RGC | 2024 | Active |
| Maverick Heating & Air Conditioning LLC | RGC | 2018 | Active |
| Mavs Drywall LLC | RGC | 2023 | Active |
| Mavs Masonry And Veneer Specialties LLC | RGC | 2024 | Active |
| Max Drywall LLC | RGC | 2026 | Active |
| McCoy Maintenance And Remodel LLC | RGC | 2018 | Active |
| MCD Homes LLC | RGC | 2018 | Active |
| McDermott Holdings LLC | RGC | 2025 | Active |
| McDivitt Construction LLC | RGC | 2021 | Active |
| McGovern Construction Inc | RGC | 2025 | Active |
| McGrath Construction Services Inc | RGC | 2006 | Active |
| McLane Pro LLC | RGC | 2026 | Active |
| McMullen Building And Land Maintenance LLC | RGC | 2023 | Active |
| MD Siding LLC | RGC | 2019 | Active |
| Mehan Development LLC | RGC | 2018 | Active |
| Meridian Contracting LLC | RGC | 2022 | Active |
| Metalhead Custom Contracting LLC | RGC | 2025 | Active |
| Metolius River Plumbing Inc | CGC2, RGC | 2005 | Active |
| Michael Nicholas Construction LLC | RGC | 2019 | Active |
| Michael Wilkins Construction LLC | RGC | 2005 | Active |
| Mike Wilt Construction LLC | RGC | 2005 | Active |
| Mikes Fence Center Inc | CGC2, RGC | 1989 | Active |
| Mirage Builders Limited Liability Company | RGC | 2024 | Active |
| Miron RG Construction LLC | RGC | 2026 | Active |
| Mirror Pond Builders & Air LLC | RGC | 2025 | Active |
| Mirror Pond Handyman Services LLC | RGC | 2025 | Active |
| Mission Building And Renovation LLC | CGC2, RGC + LBPR | 2008 | Active |
| Mitch Huddleston Construction LLC | RGC | 2017 | Active |
| MJ Construction And Development LLC | CGC2, RGC | 2017 | Active |
| MJ Larraneta & Company | RGC | 1992 | Active |
| MLJ LLC | CGC2, RGC + LBPR | 2022 | Renew by Dec 7, 2026 |
| MNKM LLC | RGC | 2025 | Active |
| Modern Construction VM LLC | RGC | 2025 | Active |
| Modern Craft Construction LLC | RGC | 2019 | Active |
| Modern Maker LLC | RGC | 2022 | Active |
| Modernfab LLC | RGC | 2017 | Active |
| Mokko LLC | RGC | 2018 | Active |
| Momentasize Construction Inc | CGC2, RGC | 2021 | Active |
| Monarch Construction LLC | RGC | 2018 | Active |
| Montana Builders LLC | RGC + LBPR | 2026 | Active |
| Montebellos Concrete Construction LLC | RGC | 2018 | Active |
| Montgomery Builders Inc | CGC2, RGC | 2014 | Active |
| Morales And Van Blokland Inc | CGC2 | 1990 | Active |
| Morgans Classic Construction Inc | RGC | 2009 | Active |
| Morton Log & Timber Co LLC | RGC | 2021 | Active |
| Mosley Construction LLC | RGC | 2018 | Active |
| Mottern & Micheletti LLC | RGC | 2020 | Active |
| Mountain High Builders Inc | RGC | 2004 | Renew by Dec 23, 2026 |