The Energy Index specifies how energy-efficient a home is. The lower the rating, the more energy-efficient the home. An official EPA adviser establishes the Energy Index. You can find an adviser through the following websites (in Dutch):
If you already have a mortgage with us and your home is eligible for the sustainability discount, you can only get the discount at the following times:
The sustainability discount will then be effective only during the term of the next fixed-rate period. As soon as this fixed-rate period ends, the discount will cease to apply, as it only applies for a single fixed-rate period.