Just a brief note from me... I used to live in an (renovated) two-family house from the 1930s on the upper floor (already with sloped ceilings) and attic (one apartment). In summer it actually became unbearably hot there, even though there were hardly any windows facing south, because the ridge of the house runs east-west. Now in my house it’s the same, and it is very pleasantly tempered even in the attic. A huge difference, but this is a new building according to today’s standards. Office upstairs, the rest can then be nicely on one level... Where in the east are you? For the interior construction alone (from windows) I come to 1000€/m² and that doesn’t involve any luxury...