The energy certificate documents the energy quality of a building. Under the Energy Certificate Presentation Act 2012, in short EAVG 2012, the seller must present the energy certificate to the buyer at the latest at the conclusion of the contract and hand it over promptly thereafter. This duty to present and hand over applies to the seller and cannot be contracted away to your disadvantage.
Mandatory details must already be given in the listing. The heating demand, in short HWB, and the overall energy efficiency factor, in short fGEE, must be stated. This way you can compare different properties before you decide on a viewing. We explain the terms in the glossary under energy performance certificate.
If the energy certificate is missing, this has consequences. If the seller presents no certificate despite a request, the EAVG 2012 deems at least an average overall energy efficiency of the building to be agreed. If the actual quality deviates from this to your disadvantage, that can support your warranty rights. You should nonetheless always request the certificate before signing.