Utility cellar or not, it doesn't matter at all. If you have a floor slab, the sound is transmitted via structure-borne sound from the walls of one half into the floor slab and then back into the walls of the other half. To prevent this, either a separation or a well-absorbing layer between the floor slab and the walls resting on it is needed.
One more anecdotal addition: When we had a small cinema installed as a screening room in the basement of a Berlin commercial courtyard back then (the rooms above also belonged to us), a kind of decoupled room within a room was built. The costs were six-figure. So getting something like that under control afterward can be expensive...
I can't wrap my head around why there isn't finally a standard for this ... separating semi-detached houses ... that would be fine ... afterwards you only have trouble with that crap ... that the [Bausparvertrag] didn't say anything about it????
Really interesting. As I said, I would never have thought of something like this in my life and at this point I am also relying on the expertise of the BU. He has built several semi-detached houses in the area over the past decades. I also quickly searched the internet. In other forums, the separation is also discussed controversially, among other things because separate floor slabs could have problems with water penetrating between the slabs.
But I will also ask the building savings contract what its opinion on this is. Cutting and separating could still be done at the moment.