Floor plan planning shortly before submitting the building application

Yes, it becomes narrower and lower because the structural dimensions without the frame are specified in the plan!

I just measured the clear passage width again. It's 81 cm. I don't want it any narrower. So if 88.5 cm is entered in the plan, do you think it will end up narrower?

No, those will also be 88.5 cm doors.

No, those will also be 88.5 doors.

Then it should fit. Or has no one else noticed so far that the doors for the house are undersized?

They are not undersized. For interior doors, 88.5 is standard, for guest bathrooms or storage rooms it can sometimes be 63.5, otherwise 76, and 101 is only common in ["altersgerechter" Planung].

With 2.84 m room height OKFB on the ground floor clearly undersized! Also in height! Roughly aim for 1.01 m / 2.32 m on the ground floor. In the end, that is just barely comfortable and does not amaze one with the width and height...

I agree with Otus ... with a ceiling height of 284 cm, otherwise it really looks like a dollhouse.