The document summarizes a presentation given at the Ceramic Days Construction Conference on the 26th of November 2013 in Brussels, Belgium. The presentation discussed the development of a Product Category Rule (PCR) for clay construction products to standardize environmental product declarations (EPDs) across Europe. Key points included an overview of life cycle assessment (LCA) and EPDs, the framework developed by the European Committee for Standardization (CEN) for sustainability assessment of construction works, and the objectives, scope, methodology and requirements defined in the PCR for clay products to allow consistent EPDs to be produced. The PCR is intended to facilitate environmental evaluations and comparisons of clay construction materials at both national and European levels.