National Millwork (NMI) was founded in 1998 by Otto Nonnenmann and Michael Bosco with the goal of becoming a full-service door, hardware, and millwork company that would be both supplier and subcontractor to the construction industry. With a focus on manufacturing the highest quality doors and a commitment to installing everything they manufacture, NMI has experienced tremendous growth and expansion. NMI operates full hollow metal, door, key & hardware shops; manufactures and installs pre-hung, pocket, bypass and exterior doors, clubhouse and lobby finishes, and interior trim and mouldings. NMI also supplies and installs Division 10 specialty products, including commercial bathroom partitions and washroom accessories.

Products & Services

Doors, Frames & Hardware (Division 8)

Millwork (Division 6)

Specialty Products (Division 10)

Pre-Construction Services (Detailing, Estimating, Design)

Installation Services

Maintenance Services (Aftermarket & Repair)

Custom Fabrication & Welding

Pre-Hung Doors