Abstract: The invention is directed to an insulated door and a method for manufacturing such have a glazing or window section installed therein. The frame of the window section is installed during manufacture and is flush with both faces of the door. The flush glazed door comprises a rigid wooden frame having an opening for mounting an insulated window therein, a metal sheathing secured on each side of the frame, a window frame unit mounted within the wooden frame within the opening and an insulated window positioned within the window frame unit. The window is retained within the frame in air-tight and weatherproof manner.