Composite doors are made of various materials, including wood, steel, and insulation, making them much more energy-efficient than uPVC doors. In fact, composite doors can save you up to 30% on your energy bill. While composite doors may have a higher initial cost than uPVC, their durability and energy efficiency can lead to long-term savings on energy bills. Fitting composite doors can save you money on energy bills, potentially reducing them by up to £90 per year. This is due to their superior energy efficiency compared to uPVC doors, trapping more heat inside your home.