The requirements concerning the energy efficiency of buildings are regulated by Act No. 406/2000 Coll., on Energy Management, as amended, and by its implementing regulations.

Compliance with the requirements is proved by the relevant building’s Energy Performance Certificate (EPC) (in Czech, průkaz energetické náročnosti budovy), which is valid for 10 years from issuance or until a major change to the building occurs. This certificate is required for all new buildings and has to be obtained for existing buildings upon the occurrence of certain circumstances (such as major reconstruction, modification of the heating solution, or planned sale or lease of the building). All buildings are classified based on their energy performance into one of seven energy classes from A to G, with A being the most efficient.

When a constructor applies for a building permit for the construction of a new building, it must submit documentation confirming that the applicable energy performance requirements (nearly zero-energy consumption standard) have been met.

The owner of an existing building must ensure that the respective energy consumption level stated in the EPC is included in the information and advertising materials when selling a building or leasing premises. If the owner hires an agent to arrange for the sale or lease of its premises, the graphical part of the EPC or a verified copy of it must be provided to the agent, so that the energy consumption information may be stated in the agent’s information and advertising materials.