REHAU Windows and Doors: Building Regulations Parts L and F

Planning new REHAU windows or doors? Since June 2022, replacement windows and doors in England have had to meet updated Building Regulations: Part L for energy efficiency and Part F for ventilation. This guide explains what the changes mean in simple terms, and how REHAU products help keep your home warm, well ventilated and compliant. It’s general information, so always check with your installer or local building control for your project.