Wall thickness children’s room / bathroom

Thanks for the info nightdancer, I will read through it. I think since it is also interesting for the OP: what advantages does masonry have if you have the choice. Lightweight construction is cheaper, more flexible, and cables can be installed internally. The only disadvantage I see is with heavy wall cabinets.

Lightweight construction is not necessarily cheaper, quite the opposite. You can quickly reach 100,- Euro/m2.

what advantages does masonry have when you have the choice.

Objectively: none. However, it is easier to sell to customers .... "You get a completely solidly built house" and it also caters to the common (naive) prejudices (easier to sell) that lightweight walls in the attic are not real walls

Lightweight construction is cheaper, more flexible, and cables can be routed inside. I only see a disadvantage with heavy wall cabinets

Cheaper: no. Regarding hanging cabinets - you need almost special fasteners for every stone; these also exist for lightweight walls

Rhenish greetings

How is the sound insulation with solid gypsum walls? They are also 10 cm thick and I have seen them several times in upper floors.

If I now summarize all this and have understood it correctly, I should ask the architect whether it would make sense to build the wall using drywall construction in order to achieve maximum soundproofing with minimal wall thickness.

As a child of a terraced house who lived for 12 years next to his sister separated by a lightweight partition wall and separated from the bathroom by a 115mm KS: I rarely heard my sister talking, what you hear is knocking or bass. I always heard the bathroom – but that was probably because the pipes were simply laid in the wall. Conclusion: no matter what you do, make sure it is done properly!!!