Just as information for future builders:
Something like this must be approved in writing by the supplier.
If I recommend someone to run a red light because no one is coming... I also have to tell them that they can get into trouble because of it.
Exactly. And don't forget that the "contribution" to the neighbors of course also has to be taxed.
Also, it must be a water hose with drinking water approval, because if water from it is used in the construction coffee machine, then the water is considered a foodstuff...
You really shouldn't be surprised that everything is getting more expensive these days. We obviously make it harder for ourselves than it actually is.