We already have an energetic construction supervision anyway, but he actually only takes care of the KFW stuff / compliance with the requirements in that regard. I have never seen him / heard from him since the contract was signed, I think he just collects his fee and signs something. No idea. It could also be that he is really involved and I just don't hear anything about it. Communication towards the builders is not always a strength of my general contractor.
I am now considering commissioning an expert shortly before acceptance who only accompanies us during the final inspection; maybe he will notice things we don’t see. Now I talked to one on the phone, and it was a somewhat disturbing experience. He somehow seemed very confrontational. He said things like "if you want a smooth acceptance, faleri falera, you are in the wrong place with me." I know he wanted to advertise himself with that, but I just thought "then I really am in the wrong place with you."
I want someone neutral who points out really serious issues to me, but who is also able to say "this is fine" when something is okay. Someone who looks for every little fault on purpose is not in my interest.
Now I am considering whether we should just keep searching or if I should leave it be.