DIN EN 15804 (often shortened to EN 15804) “Building Sustainability – Environmental Product Declarations – Basic Rules for the Product Category of Building Products” ensures that all EPDs for building products, building services, and building processes are derived, verified, and represented in a uniform manner. It stipulates the fundamental product category rules (PCR). According to EN 15804, EPDs in the building industry will form the basis for the description and evaluation of buildings. They thereby specify ISO 14025 for building products.