How to meet the minimum energy performance requirements of Technical Conditions in year 2021?

According to the Recast of the Energy Performance of Buildings Directive (EPBD) from 31 December 2020 new buildings in the EU will have to consume 'nearly zero' energy (NZE) and the energy will be 'to a very large extent' from renewable sources. Each Member State has to define minimum energy performance requirements for NZEB. In accordance to polish Technical Conditions (TC) buildings envelope and installations have to design and constructed in a way that ensures low energy consumption. Achieving the required value of demand for non-renewable primary energy is however not easy. The paper presents solutions used by architects and designers, participating in contest of Murator The available house of 2021. The task of the contest was to design a single family building meeting the requirements of TC2021. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).