Building codes made stricter in 2013. The main requirement is related to the overall energy performance of buildings. Supplemented by rather detailed requirements on the building envelope and on installations, for instance minimum requirements on thermal resistance of different parts of the building envelope, on air tightness of the building envelope as a whole, on efficiency of boilers, energy performance of windows etc. IEA/IRENA Global Renewable Energy Policies and Measures Database © OECD/IEA and IRENA, [November 2020]