Available in Aluminum and UPVC. Bi-folding Doors are a fantastic, innovative option to Patio Doors. Your garden and living space can be joined by folding these Doors in concertina fashion to merge your a garden and living space together, creating a wonderful space and feel for dining, entertaining or simply just to enjoy the view. Each Door can be opened by a main traffic door when the need for opening the entire door is not desired. Popularly used on Conservatories and Orangeries, these stunning Doors can also be used inside as a divider between rooms.