Northern Window & Door Manufacturing Ltd. is Northwestern Ontario's only window manufacturing facility. Located in Thunder Bay we build windows designed for our extreme northern climate. Manufacturing our own products allows us to monitor and control all aspects of production to ensure a quality, worry free, low maintenance product for our customers. We manufacture windows for residential (renovation or new construction) and commercial applications using the highest quality components from industry leaders, Rehau, Truth Hardware, PPG, Triple Seal & Truseal. Whether for a new home or as an upgrade your existing windows and doors, Northern Windows & Door Manufacturing Ltd. has the right solution for your building or renovation projects. Northern Window & Door Manufacturing Ltd. is Northwestern Ontario's only window manufacturing facility. Located in Thunder Bay we build windows designed for our extreme northern climate.