Only belief allowed, solutions?

No idea.., But be careful with your contract partner - the ceiling height of 2.46 RBM is not ideal either. It should be 2.50. Anything less is excessive frugality.

If I interpret the dimensions correctly, the eaves height is currently at 6.955 m, where 7.50 m would be allowed. I would raise the knee wall by half a meter and flatten the roof pitch from 35° to 30°. Dormers / returns are definitely not allowed by the development plan, and dormer windows (as well as skylights) are clearly nonsense with a knee wall of 150, as you can hopefully understand as a layperson, at the latest from the picture.

My wife is afraid it will then look gawky. Do you have any idea if something like that would be significantly more expensive? Since the financing is already in place, that is also a topic.. Many thanks for the idea. I will put it on the breakfast table right away.

No idea.., But watch out a bit with your contract partner - the ceiling height with 2.46 RBM is also not ideal. It should be 2.50. Anything less is excessive thriftiness.

Thank you! We said that the 2.46m is acceptable since we currently have 2.30m and the ceiling has never seemed low to us. But I will think it over again.

Omit belief and if absolutely necessary double casement windows.

The ceiling height of 2.46 RBM is not ideal either. It should be 2.50. Anything less is excessive penny-pinching.

230 instead of 250 is not excessive, just Swabian. And if read correctly, the raw construction measurement here is 262 and 246 without tiles and ceiling plaster, so still over 240.

Do you have any idea if something like that would be significantly more expensive?

The "inclusive" sign-waiter apparently "saves" you the fee for an architect, but then builds you a mess that you have to straighten out again with a knee wall increase. For the two rows of bricks, the general contractor can then charge so handsomely that the difference to the fee for a freelance architect is practically gone. So beware of whom you fall for. But you can also fight the general contractor with his own weapons and simply leave out the dormer - then you just make the passage to the dressing room at the other end of the closet. A knee wall of 150 is already sufficient for windows. And/or instead of the dormer you make a dormer window (without a window or as a shed dormer with double casement window).

But I'll think it over again.

I forgot to mention the washbasins upstairs last night: they seem quite small.... estimated roughly they might be 30cm deep... Our guest WC washbasin is even deeper o_O And the bedroom is "furnished wrong": you would almost bump your head on the sloping roof when walking around the bed. You really have to be careful or you place the bed under the sloping roof, which makes more sense. But that would have the consequence that the dressing room is accessible from the wrong side. The logical sequence would be the short way, turning directly from the bedroom door to the dressing room. I hope the bricklayers think more along, otherwise the children's room will also be hard to enter without a door. It's not your fault, but it surprises me that something like this happens to a professional planner. You have no choice but to also check the ground floor.