| MRB Construction LLC | CC-01 | 2026 | Active |
| MRN Homes LLC | CC-01 | 2012 | Active |
| MSD Painting LLC | CC-01 | 2016 | Active |
| Mt Squared Construction LLC | CC-01 | 2022 | Active |
| Multi-Service Drywall LLC | CC-01 | 2020 | Active |
| Musburger Industries LLC | CC-01 | 2024 | Active |
| Mv227 LLC | CC-01 | 2025 | Active |
| Myrgen Construction LLC | CC-01 | 2023 | Active |
| N C Power Systems Co | CC-01 | 2000 | Active |
| N Pac Home Repair&Remodel LLC | CC-01 | 2010 | Renew by Nov 4, 2026 |
| N&R Construction LLC | CC-01 | 2004 | Active |
| N2 Builders LLC | CC-01 | 2024 | Active |
| N2 Design - Build LLC | CC-01 | 2021 | Active |
| Nabs Brothers LLC | CC-01 | 2025 | Active |
| Nakata Construction LLC | CC-01 | 2019 | Active |
| Nathie Katzoff Art & DSGN LLC | CC-01 | 2026 | Active |
| Nautilus Sound Design LLC | CC-01 | 2010 | Active |
| NB Construction Inc | CC-01 | 2017 | Active |
| Neighborhood Carpenter LLC | CC-01 | 2025 | Active |
| Nest Design Build | CC-01 | 2008 | Active |
| Nestingen Carpentry LLC | CC-01 | 2001 | Active |
| New Beacon Building LLC | CC-01 | 2024 | Active |
| New Classic Homes Seattle LLC | CC-01 | 2023 | Active |
| New Digs Design LLC | CC-01 | 2020 | Active |
| New Era Jm's LLC | CC-01 | 2021 | Active |
| New Exteriors LLC | CC-01 | 2021 | Active |
| New Finish LLC | CC-01 | 2023 | Active |
| New Home Solutions LLC | CC-01 | 2014 | Active |
| New Horizons PNTG & Impr LLC | CC-01 | 2026 | Active |
| New Look Const & Fndtn RPR LLC | CC-01 | 2026 | Active |
| New Trail Landscaping LLC | CC-01 | 2022 | Active |
| New Wave Construction Inc | CC-01 | 2014 | Active |
| Newgenpros LLC | CC-01 | 2026 | Active |
| Newtown Builders Inc | CC-01 | 1997 | Active |
| Next Construction LLC | CC-01 | 2026 | Active |
| Next Level Property Maint | CC-01 | 2021 | Active |
| Nfi Enterprises LLC | CC-01 | 2010 | Active |
| Nic Solution & Remodel LLC | CC-01 | 2024 | Active |
| Nice Building Corp | CC-01 | 2019 | Active |
| Nihao Construction Inc | CC-01 | 2009 | Active |
| Ninebark Design Build LLC | CC-01 | 2009 | Active |
| Nip Construction LLC | CC-01 | 2022 | Active |
| Nirvana Lndscps & Irrigatn LLC | CC-01 | 2021 | Active |
| NJN Construction LLC | CC-01 | 2021 | Active |
| NK Build LLC | CC-01 | 2013 | Active |
| NK Builders LLC | CC-01 | 2020 | Active |
| Nob Hill Development LLC | CC-01 | 2025 | Active |
| Nob Hill Style | CC-01 | 2026 | Active |
| Noble Woodwork Inc | CC-01 | 2018 | Active |
| Nolan Construction Corp | CC-01 | 2000 | Active |
| Nomadic Construction LLC | CC-01 | 2023 | Active |
| Nor Wes Construction Inc | CC-01 | 1973 | Active |
| Norm Davis Builder Inc | CC-01 | 2000 | Renew by Nov 3, 2026 |
| Nortech Inc | CC-01 | 2026 | Active |
| North American Terrazzo Inc | CC-01 | 2006 | Active |
| North Cape Contractors LLC | CC-01 | 2019 | Active |
| North Coast Electric Company | CC-01 | 2023 | Active |
| North East Landscpng Srvcs LLC | CC-01 | 2016 | Active |
| North Seattle Carpet CLN LLC | CC-01 | 2026 | Active |
| North Seattle Construction | CC-01 | 2021 | Active |
| North West Integra Group | CC-01 | 2023 | Active |
| Northern Marine Salvage Inc | CC-01 | 1999 | Active |
| Northgate Construction LLC | CC-01 | 2025 | Active |
| Northpointe Const Group LLC | CC-01 | 2026 | Active |
| Northview Holdings LLC | CC-01 | 2023 | Active |
| Northwest Aire Services Inc | CC-01 | 2004 | Active |
| Northwest Building Tech Inc | CC-01 | 1988 | Active |
| Northwest Cedar Fence Sols LLC | CC-01 | 2025 | Active |
| Northwest Contour BLDG Co Inc | CC-01 | 2013 | Active |
| Northwest Homework Inc | CC-01 | 1998 | Active |
| Northwest Hype Const LLC | CC-01 | 2026 | Active |
| Norwood PNW LLC | CC-01 | 2025 | Active |
| Noumena Built LLC | CC-01 | 2024 | Active |
| Nourished Roots Inc | CC-01 | 2018 | Active |
| Nouveau Construction LLC | CC-01 | 2010 | Active |
| Nova General Contractor LLC | CC-01 | 2025 | Active |
| Novo Painting & Prop Srvs LLC | CC-01 | 2012 | Active |
| Now Painting LLC | CC-01 | 2023 | Active |
| NRC Environmental Services Inc | CC-01 | 2004 | Active |
| Nurse Log Landscape Design | CC-01 | 2026 | Active |
| NW Craft Homes LLC | CC-01 | 2024 | Active |
| NW Premium Home | CC-01 | 2023 | Active |
| NW Projex LLC | CC-01 | 2022 | Active |
| NW Property & Development LLC | CC-01 | 2014 | Active |
| NWBP LLC | CC-01 | 2019 | Active |
| Nwin Homes LLC | CC-01 | 2023 | Active |
| O'Neill Plumbing Co | CC-01 | 1975 | Active |
| O'Shaughnessy Builders LLC | CC-01 | 2007 | Active |
| Oasis BR LLC | CC-01 | 2023 | Active |
| Oasis Construction Group Inc | CC-01 | 2016 | Active |
| Obed Galdamez Construction LLC | CC-01 | 2017 | Active |
| Ocean Park Mechanical Inc | CC-01 | 1998 | Active |
| Ochre LLC | CC-01 | 2020 | Active |
| Ocm LLC | CC-01 | 2023 | Active |
| Oddjob Construction | CC-01 | 2014 | Renew by Dec 26, 2026 |
| Odyssey Plumbing | CC-01 | 2023 | Active |
| Ohno Construction Company | CC-01 | 1975 | Active |
| Ohno-Touchdown JV | CC-01 | 2018 | Active |
| Olive & Iron Studios LLC | CC-01 | 2026 | Active |
| Oliver & Blue Construction LLC | CC-01 | 2017 | Active |