The EU directive on green homes will radically change "the requirements for obtaining the energy performance certificate (Ape) These requirements will become much more stringent and will necessarily have to take into account the new obligations to adapt the systems envisaged by the Directive", says Maria Deledda, counsel at the Hogan Lovells law firm. It is also envisaged that each Member State must create a database on energy performance of individual buildings and the entire national building stock which, in the event of sale, the buyer can access with the consent of the seller.