Single panel garage doors were all the rage before sectional doors came into fashion. … Instead of being hung on overhead tracks, most single-panel garage doors are hung on a very strong hinge system attached to the jam. Once fitted with springs, this allows the door to swing easily without a garage door opener. Millions of one piece, jamb mounted garage doors have been installed and are operational across the USA, especially in the western regions. One piece garage doors are advantageous because they are easy to install, take up less headroom in the garage and can fit in tighter spaces than sectional doors.