| Lynstar Enterprises Inc | B | 1989 | Active |
| Lyons General Engineering Inc | A | 2005 | Active |
| Lyte Construction LLC | B | 2016 | Active |
| M - Tran Construction Inc | B | 2003 | Active |
| M B C Remodeling Inc | B | 2023 | Active |
| M B H Construction Consultants Incorporated | B | 2008 | Active |
| M E S I Construction Inc | B | 2018 | Active |
| M F A S Homes Realty Development Inc | B | 2017 | Active |
| M F Interior & Exterior Renovation Inc | B2 | 2025 | Active |
| M G M Drywall Inc | B + C9, C33, D50 | 1999 | Active |
| M2 Build System Inc | B + C5 | 2026 | Active |
| Magellan Construction Inc | A + C8 | 2020 | Active |
| Maggetti Construction Inc | B | 1988 | Active |
| Magnum Drywall Inc | B + C9, C33, C35 +3 | 1991 | Active |
| Mahic Construction | B | 2021 | Active |
| Mai Construction Inc | B | 1974 | Active |
| Main Street Builders Inc | B | 2000 | Active |
| Main Street Underground LLC | A | 2019 | Active |
| Maintenance Pro LLC | B2 + D65 | 2025 | Active |
| Malek Engineering Group | B | 2026 | Active |
| Manhattan Bridge - Construction Group Inc | B | 2023 | Active |
| Marketshare Inc | B + D42 | 1989 | Active |
| Markotic Construction Inc | B | 2016 | Active |
| Martial's Contractor Creation Corp | B | 2024 | Active |
| Marvel Builders Inc | B | 2008 | Active |
| Master Builders Co Corporation | B | 2021 | Active |
| Master Home Construction Inc | B | 2026 | Active |
| Master Pros Restoration & Remodeling Services | B | 2024 | Renew by Nov 30, 2026 |
| Matos Builders LLC | B | 2025 | Active |
| Matson Builders Inc | B | 2020 | Active |
| Maximum Construction Inc | B | 2008 | Active |
| May Construction Inc | B + C33 | 1988 | Active |
| MBP Construction Inc | B | 2026 | Active |
| MC Corp Inc | A | 2023 | Active |
| MC Donald O C Co Inc | A, B + C4, C20, C36 +2 | 1958 | Active |
| MCL Restoration & Construction Inc | B | 2026 | Active |
| MCS Painting & Remodeling | B + C33 | 2008 | Active |
| Medical Facilities Solutions LLC | B | 2022 | Active |
| Medinas Builders Inc | B | 2017 | Active |
| Megati General Construction LLC | B | 2020 | Renew by Dec 31, 2026 |
| Mekong Delta Incorporation | B + C10 | 1994 | Active |
| Melendez Design & Build LLC | B | 2024 | Active |
| Mello Pipelines Inc | A | 2000 | Active |
| Mendozza Construction Inc | B | 2021 | Active |
| Merlo Construction Services Inc | B + C33 | 2006 | Active |
| MG Lobos Inc | B | 2026 | Active |
| MHM Construction Inc | B | 2023 | Active |
| Michel Construction LLC | B | 2025 | Active |
| Mileone Builders Inc | B | 2024 | Active |
| Millennium Enterprises Inc | B + C33 | 2007 | Active |
| Millennium Pacific Trading Inc | B + C4 | 2009 | Active |
| Mission Peak Builder LLC | B | 2019 | Active |
| Mittal Muller Construction | B | 2024 | Active |
| Mivo Construction Inc | B | 2022 | Renew by Dec 31, 2026 |
| ML Blue Door Inc | B | 2019 | Active |
| MN Construction | B | 2026 | Active |
| Modern Construction & Remodel Inc | B | 2023 | Active |
| Modern Homes Builder Inc | B | 2025 | Active |
| Modern Worx Construction | B | 2020 | Active |
| Modlux Builds LLC | B | 2023 | Active |
| Modular Remodeling & Design Inc | B | 2020 | Active |
| Monster Builders Inc | B + C10 | 2016 | Renew by Nov 30, 2026 |
| Monte Craft Contractors LLC | B | 2026 | Active |
| Moose Creek Construction Inc | B | 2025 | Active |
| Mor Remodeling | B | 2026 | Active |
| Moralux Construction | B | 2025 | Active |
| Morelan Associates Inc | B | 1981 | Active |
| Morgado Building And Renovation Inc | B | 2019 | Active |
| Mount Construction | B | 2020 | Active |
| MQ Mechanical Inc | B + C10, C20, C38 | 2026 | Active |
| MRG General Construction Inc | B | 2025 | Active |
| Mullins Construction Inc | B | 2005 | Active |
| My Electrical & Construction | B + C7, C10 | 2026 | Active |
| N A N Construction Inc | B | 2017 | Active |
| N T Bay Area Construction Inc | B + C20, C36 | 2018 | Active |
| Nail Construction Inc | B | 2015 | Active |
| Nava Experts | B | 2025 | Active |
| Navarrete Robert C Builder Inc | B | 2016 | Active |
| Nayart Construction Services Inc | B | 2023 | Active |
| Nazzal Steve Construction Inc | B | 1988 | Active |
| NCM Painting & Construction Corp | B + C33 | 2017 | Active |
| Neighborhood Construction Va Inc | B | 2025 | Active |
| Nelco Design Build Incorporated | B | 2005 | Renew by Dec 31, 2026 |
| Neovana Group Inc | B | 2019 | Active |
| Net Zero Home Builders | B | 2022 | Active |
| Neves Custom Contractors | B | 2003 | Active |
| New Aplus Construction Company LLC | B | 2021 | Active |
| New Construction | B + C10, C36 | 2023 | Active |
| New View Builders Inc | B | 2025 | Active |
| New Vision Developers Inc | B | 2024 | Active |
| Newstyle Construction Group Inc | B | 2021 | Active |
| Nexrise Construction | B | 2026 | Active |
| Next 150 Construction LLC | B | 2019 | Active |
| Next 150 Construction Services LLC | B | 2019 | Active |
| Next Generation Design & Build | B | 2019 | Active |
| Next Stage Design & Build | B | 2004 | Renew by Dec 31, 2026 |
| Nexwave Remodeling | B2 | 2023 | Active |
| Neyana Design Inc | B + C54 | 2013 | Active |
| Nguyen Tom Construction Inc | B | 2012 | Active |
| Nic Plumbing Co | B + C36 | 2016 | Active |