Abstract: A shutter comprised of laterally spaced apart extruded plastic side frame members or rails having a track on their respective rear sides which extends over the length of the member. Panels, such as louvre panels, have runners which slide on the tracks in interlocking fashion to form a shutter assembly. The shutters are adjustable to any desired window or door height by cutting off parts of the runners of the louvre panels so as to eliminate one or more louvre slats and also cutting off an equal length from the frame members. The upper and lower end panels are secured with pins which pass through the frame members so the panels cannot slide from the tracks.