You will find a detailed description of energy efficiency requirements for buildings within the German Energy Saving Regulation (EnEV 2009). A potential buyer or renter of a building can request this certificate to compare the energy consumption of different properties prior to purchase or signing the rental contract. With today’s high and even rising energy costs having these documents will be critical for all smart consumers, buyers and sellers. With an energy performance certificate, you as a real estate owner are prepared and ready for a successful sale or letting of your property.