In Ireland, most homes for sale must have a valid Building Energy Rating (BER) certificate, and the BER should be included in property advertising. You generally do not need to achieve a particular minimum rating before selling, although a better rating may appeal to buyers and affect their running-cost expectations. A BER assessment must be carried out by an SEAI-registered assessor, and exemptions can apply to certain properties. Check the current requirements with SEAI or your estate agent, especially if the property has unusual features or has been substantially altered.