The world is changing. The subject of sustainability is at the center of many global political discourses and determines the actions and attitudes to life of a large part of the population. In order to minimize climate change, the international community decided in Paris in 2015 to limit global warming to significantly below 2°C, but more likely to below 1.5°C. The building sector, with its total energy consumption, is of particular importance. With a total final energy consumption of more than 40%, the building sector has a key role to play in this. Consequently, success in achieving the climate targets is strongly linked to change in the building sector.