"Homeowners who want to sell their house must adjust the indicative energy label online for the sale to the current situation. Comparable to the pre-completed declaration from the Tax Authorities. Homeowners log in to Energielabelvoorwoningen.nl with their DigiD and adjust their home details there. Sometimes digital proof is requested, such as a construction report, invoice or photo.If a recognized expert - a real estate agent, energy consultant or construction technician - has approved the application, the label is registered in an online database.The energy label is not mandatory for all homes. The obligation does not apply to monuments and houseboats, for example."