MPN Windows is an official installer of Endurance composite doors in Cardiff and South West Mid Glamorgan Wales. All our composite doors are produced by Endurance, please click on the images to view the extensive range of doors to choose from. Endurance Doors offers the UK’s finest timber-core composite doors, which high to the most secure lock locking available for the very best home security, energy efficiency and beauty. There are hundreds of designs, Full range of colours inside and out and an unsurpassed range of handles and accessories to choose from.