EXTERNAL DOORS & WINDOWS / COMPOSITE DOORS Composite doors are rapidly becoming the preferred choice of exterior doors for many people due to the huge advantages that Composite doors have over the alternative wooden doors, steel doors and UPVC doors. They are made from GRP fibreglass, combined with PVCu with steel reinforcement and a rigid, high density energy retaining, injected polyurethane core. With the sophisticated appearance of a solid timber door and all the stability, energy efficiency and durability of modern materials, our Composite Doors are the perfect hassle- free protector for you home and family