I overlooked it because I was only using my phone:
The legend of the development plan only allows gable roofs.
And here I want to advise Franky once again:
1. Visit the property, 2. read the development plan, 3. consider whether you can live with the development plan. If yes, then calculate (possibly with a soil survey and/or architect) how much earthwork is necessary, 4. buy the property.
After that, the rule is: don’t plan or favor what is not allowed or does not exist.
This discussion is more or less pointless.
And without speaking ill of Katja’s design: a different design that fits will surely be found for a hillside property.
I am reading right now: the property has already been purchased...
Therefore, reconsider your requirements for your dream house and then include a cross-section along with a photo and site plan of the property.
If you have already owned a property for two months, you usually have a self-made drawing with the property’s dimensions and are moving rectangles around.
So bring that on, and then we will proceed.