House construction on a slope (Central Hesse)

I would remove the "something." And one should choose an architect instead of a draftsman not least because a) she will talk you out of such a huge smoker's balcony for the child and b) manages on both sides not to have to exempt the eaves heights by "50 to 80 cm" (or rather: want to, because I rely on the reason of the official mold). The house is way too big. If you are not double earners in A14, it is beyond your means - but at least it offers endless space where none is needed. Train your sense of proportion. And yes, the suspicion is correct: per square meter, a roof terrace easily ends up costing at least as much as fully enclosed space.

You have to cut more than 20 sqm. Write more precisely about the budget. How much have you planned for ancillary building costs including earthworks, house including equipment, outdoor facilities including planned carports or garages, and furniture including kitchen?

Yes, we would like to have at least a knee wall of 1.20m in the upper floor, but we also don't want to dig in so much with our terrace next to the footpath that everyone looks down on us. Without an exemption, that probably won't really work. The roof terrace can of course be much smaller, but then are there no problems with the one permitted full floor? I understood it so that this is required for the number of floors in that size.

No one will surely look down on a house of this upper floor area, rather mock it as Villa Dr. von Großkotz. A knee wall of 120 cm with an oversized attic and additionally removed knee wall windows can be better realized as a dwarf wall (Drempel) in this case, which a freelance architect would also have to check for herself. And on a full-story count, you absolutely don't need to provide full-surface walkability. So, then we already have the cure plan: dwarf wall instead of knee wall – this will also nominally rightsize the attic – the upper floor-related extra area on the ground floor can go – this benefits the garden, so the reduced roof terrace is not a loss. And as a small side effect, the palace also becomes an affordable house. The fee that you deduct from the architect you can gladly transfer to me :)