According to the Energy Efficiency Law No. 5627 and the Energy Performance Regulation in Buildings issued accordingly, in order to ensure the effective and efficient use of energy and energy resources in buildings, prevention of energy waste and protection of the environment, at least the energy requirement and energy consumption classification of the building, greenhouse gas emission level, insulation properties. and the efficiency of heating and/or cooling systems.

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In simpler terms, the energy performance classifications of white goods such as refrigerators, washing machines or air conditioners are now valid for buildings as well. These classifications are made from A to G. Class A indicates the most efficient level, while class G indicates the lowest efficient level. The document showing this classification in buildings is called Energy Performance Certificate or EKB for short.

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The energy identity certificate class of the new or under construction buildings should be designed and constructed in such a way that the class C is the lowest. Newly constructed or under construction buildings that are lower than Class C cannot obtain occupancy permits by law.

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There is no minimum classification level requirement for an energy performance certificate for existing buildings. Existing buildings can receive Energy Performance Certificates of all classes from Class A to Class G, depending on their parameters such as current thermal insulation, thermal insulation of windows, efficiency of heating-cooling equipment, efficiency of lighting fixtures.