Energy certificates for buildings
The introduction of energy certificates in all member states of the European Union – and as such also for Germany – was required in course of the implementation of the first Directive of Energy Performance of Buildings.
When the directive came into effect (2006), energy demand certificates for new buildings were already introduced in Germany through earlier ordinances since 1995. Furthermore, regional and national pilot projects on voluntary basis for the issuance of energy certificates were widely introduced. Additionally there was a long tradition of "heating cost accounting" which could serve as a suitable basis for the issuance of energy consumption certificates.
Based on this, with the issuance of the Energy Saving Ordinance 2007 (EnEV 2007) the government opted for a so-called "dual system" which foresees coexisting certificates based either on demand- or on consumption. This compromise was supposed on one hand to provide the desired best possible description of the energetic performance of the building as well as on the other hand to limit financial administrative burden to an affordable level.
With the EnEV 2013 getting into force by 1st May 2014, the energy certificates are changed significantly. This was due to the transposition of European as well as some national issues. Significant changes are – among others – the establishment of an independent control system as well as the introduction of energy classes for residential buildings