So the majority thinks they just don’t want to and still say "aren't allowed"? I find that strange. For example, the carpenter, he is there in the house anyway for the stairs. He wouldn’t even have travel costs, he could just write me any nice invoice for that. :/
The plumber also said something about warranty claims, but I didn’t fully understand it. He is also in our house. He installs the tub, the toilets, and the shower. I said we could also exclude the warranty. But he said it was "doesn’t matter what I sign for him," if it went to court, he would always be liable if "water comes out of the wall" somewhere. But I wonder if that wouldn’t be the case anyway if water comes out somewhere that isn’t a pipe. I mean, it can’t be my washbasin’s fault if water flows into the wall under the plaster, for example? If water comes out of the pipe somewhere and flows into my bathroom, then that’s my fault / the fault of the washbasin installation. That can be clearly distinguished, right, or am I not aware correctly?