This document is primary a guidance and shows instructions, explanations and examples for both preparation of declarations of performance and CE marking in accordance with 305/2011 EC. The guidance is expecialliy for harmonized standards of CEN/TC 163 e.g. EN 997, EN 12764, EN 13310, EN 13407, EN 14055, EN 14296, EN 14428, EN 14516, EN 14527, EN 14528 and EN 14688. Products covered by these harmonized standards and therefore the CPR are WCs and WC suites, wirlpool baths, kitchen sinks, wall-hung urinals, WC and urinals flushing cisterns, communal washing troughs, shower enclosures, baths for domestic purposes, shower trays for domestic purposes, bidets and wash basins. The relationship of the above mentioned standards with EU Construction Products Regulation can be found in the informative Annex ZA of the respective standard. This document is guidance only and has no mandatory function. Legal requirements stated in 305/2011 EC and complementary delegated acts of EC e.g. 148/2014 EC and 574/2014 EC. European legislation e.g. 305/2011 EC and delegated acts could be found at http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1492068177606&uri=CELEX:32011R0305 . At the web pages of the European Commission DG GROWTH could be found an overview of existing legislation for 305 /2011 EC, the so called construction product Regualation (CPR). The webpage can be found at https://ec.europa.eu/growth/sectors/construction/product-regulation_en .