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.