Abstract: A method for constructing a modular door is disclosed. The door has a front surface member and a rear surface member that are identical in shape and each formed of modular elements made of stamped sheet metal. The door also incorporates reinforcing wood boards glued between the front and rear surface members, as well as foam injected between the boards and members. This makes the door very solid and well insulated. The construction of this door is easy, cost and time saving and not waste producing.