The issuing Energy Performance Certificates (EPC-Energy Audit ) are required both for rent and for sale area greater than 50sqm . The Energy Certificate is valid for 10 years if the property does not become interventions shell.
Energy Audit
http://www.jgtech.gr/υπηρεσιεσ/ενεργειακοσ-επιθεωρητησ/ενεργειακη-επιθεωρηση.html