The Building Codes of the German federal states (Landesbauordnungen) are the most important legal basis for the engineering-related activities of the Institute at a national level.
The activities of the Institute in the field of registering energy performance certificates and inspection reports for air-conditioning systems, as well as carrying out electronic random checks are mainly governed by the revised Energy Saving Ordinance (Energieeinsparverordnung, EnEV 2013) [REF].