Aren't you afraid that you hear bathroom noises at night when your children come home from the disco etc.?
The same applies, by the way, if the parents' bedroom is next to a children's room. You do hear "everything," don't you?
We currently live in a ground-floor apartment and our toilet is next to the bedroom and I hear the flushing.
You have to differentiate between noises from the neighboring room, which you naturally hear since in a single-family house a room is rarely completely soundproof, and noises from the wastewater due to the resonance body.
In the standard of house construction, there probably won’t be any special insulation of the resonance body "wastewater shaft," you can certainly buy that as an add-on if you have the wastewater shaft next to a bedroom in the planning.
If the bedroom is next to a children's room, you can somewhat reduce the mentioned noises if you don't place the beds directly against the shared wall.
we have never been disturbed by a toilet flush or similar. So with good quality execution, that should not be a problem.
That's what I think too. But that is the layman's opinion of Yvonne