So, the plan (via PN I have a bit more than the excerpts in the threads) says: the garage floor has no slope,
I just spoke with the site manager; he said a slope was implemented. I would then have that checked by an expert. Regarding the question of the garage door height, he wrote:
"the garage doors were executed correctly according to the plans.
The rear garage door was constructed with a large rib, the same as the side door, as agreed upon in the contract.
The front garage door is executed and ordered as 'Motiv Großlamelle.'
Since the front garage door is contractually agreed as a large lamella, these lamellas are larger than the rear ones, hence these differences in measurements.
Therefore, everything was executed correctly according to the contract."
In other words, the builder is supposed to infer for himself that different lamella designs result in different door heights and it is not deemed necessary to point this out. Especially since the rear door was intended solely to allow passage for mini excavators, etc. What motivation would anyone have to install a lower door here?