Slanted window interior and too low room height?

I have already read building service descriptions in which at one point clear room height was stated and only later clear shell construction height.

Quite a few building service descriptions were pieced together by true conifers ;-) of the art of obfuscation, who by no means all know what they are doing from a technical construction point of view. A kind of Vroniplag for building service descriptions wouldn’t be bad, I just realized.

The ceiling height being lower than expected would annoy me greatly. What matters is what is stated in the [Bauleistungsbeschreibung]. If this deviates from the architect's plan and was still approved as such, the error did not occur during construction. If the room height was indeed built 2+x% differently than specified in the [Bauleistungsbeschreibung], I would seek compensation in the form of a service or financial reduction – if only to avoid sitting alone with the frustration.

If a window is installed crookedly, it simply has to be straightened. That is doable.