With regard to energy efficiency in the building sector, the “By-Law on Energy Efficiency in Buildings” dated 05.12.2008 numbered 27075 came into force, and together with the said by-law, the issuance of an energy certificate, which determines the energy consumption class of the building, became mandatory. By the end of 2021, energy identity certificates were issued for a total of 1,297,275 buildings, of which 333,691 were existing buildings and 963,584 were new buildings. By the end of 2022, it is planned to issue 1,450,000 energy identity certificates. Renewable energy systems are used in 60,437 of these buildings with energy identity certificates. By the end of 2022, renewable energy systems are planned to be used in 70,000 buildings.

Under the “By-Law on the Allocation of Heating and Hot Water Costs in Central Heating and Hot Water Systems” number 26847, which came into force on 14.04.2008, it was mandatory for all existing and new buildings with central heating systems to comply with the cost allocation practice for central heating systems. Under these applications, the number of meter operators authorized to issue metering and cost allocation certificates for buildings with central heating systems was 155 at the end of 2021.

By- Law on Green Certificates for Buildings and Settlements No. 30279 entered into force on 23.12.2017. The By-Law aims to regulate the procedures and principles for the establishment ofassessment and certification systems, aswellas the determination of the tasks, qualifications and responsibilities of the persons involved in the assessment and certification process, in order to reduce the negative impact of buildings and settlements on the environment through the efficient use of natural resources and energy. For this reason, the Ministry has developed a National Green Building System software program (YeS- TR) to carry out the certification activities, and it is planned that 10 buildings will obtain the National Green Building Certificate by the end of 2022.^[104]