Right to information from the notary even after purchase?

Don’t several builders have the same contract and can jointly finance the contract review? 2500/10 would not be quite so bad...

?? the other builders might not have a problem with it and don’t want to go against the city.

Otherwise, you quickly have the building authority with a tape measure during the house inspection.

If legal action is uneconomical and you don't want to just accept it, go to the next citizen consultation hour or something similar. That way you have created publicity. Or to the regional press. They also like to report on new development areas.