RENERPATH works for the establishment of a European prenormativa for the energetic rehabilitation of patrimonial buildings of public or private use. This prenormative will use the methodology obtained with the POCTEP RENERPATH project, based on the combination of novel and non-intrusive techniques for energy analysis. It begins in a representative group of unique properties of the community of Castilla y León and the regions of the Center and North of Portugal, from where it pretends to extend to the whole EU.