Profile: Winchester Windows & Doors Ltd. manufactures fine custom-built windows and doors in hardwoods or softwoods. Our bi-fold doors maximize the use of light by forming a wall made almost totally of glass. When they are open, the doors fold back on themselves allowing complete and seamless access to the patio and/or garden. The windows are delivered with a choice of finishes, which can be anything from their natural state, primed, to spray or hand painted.