The Energy Performance Certificate is valid for ten years and concerns all buildings, with a total area of over 50 square meters, new or existing buildings that are subject to major renovation, the existing buildings with an area of over 50 square meters or parts of these when they are sold or rented out, as well as all buildings of the public and broader public sector.    
The requirement of the Energy Performance Certificate in case of buying and selling and renting has been implemented since 9 Ιανουαρίου 2011.
The Energy Performance Certificate includes, among other things, the results of the evaluation by the energy inspector and recommendations for improving the energy performance of the building, so that the consumers are able to compare and evaluate their actual consumption and any possible improvements on the energy performance. The issuance of the Energy Performance Certificate is obligatory.

The energy inspection is an important diagnosis tool of the energy condition of the existing buildings and its improvement opportunities, but also of the legislation implementation for the energy performance of the new buildings. The private Energy Inspector, who will join the Energy Inspectors’ Register of Ministry of Environment and Climate Change, inspects the building and he / she classifies it into an energy category, based on the ratio of the building consumption to the consumption of the reference building.

The check for the right implementation of the legal framework will be realized by the Special Department of Energy Inspectors, where it is established in the Special Secretariat for the Inspection and Energy of Ministry of Environment and Climate Change and it is staffed by employees of the public and broader public sector.

The benefits from the Regulation of the Greek Energy Performance of Buildings (KENAK) are economic, social and environmental. The economic benefits are related mainly to the reduction of the operation cost and maintenance cost of buildings, but also to the revival of the construction activity. The social benefits are related to the creation of new jobs and the improvement of quality of life, whereas the environmental benefits are related to the reduction of emissions of pollutants, mainly of carbon dioxide, with a significant contribution to the combat of climate change and the energy saving.