Which typologies offer a mix of different flats? What floorpan principles enhance a residential mix? The housing hill „Hügelhaus “ in Marl has several flats of different sizes, which meant that it is possible to change flats within the familiar surroundings if the size of the family changes. In „Wohnen Morgen“ in Hollabrunn a flexible structural framework allows users to make decisions about the layout, materials, and expansion of their homes over time, creating a diverse residential mix.