Drywall with niche for mounting the shower enclosure

Hello everyone, In our bathroom, a wall (drywall) should be installed to fix the shower enclosure (glass) and as a partition to the toilet. Floor-to-ceiling, as it is more stable. Walk-in shower. Today on the construction site, I came across a thin "little wall." Only 8 cm wide. Apart from the fact that floor-to-ceiling means something else, isn’t that way too thin? Cladding? Niche=hole?? I am new to construction (new woman), so currently uncertain. What should a drywall, to which a shower wall is to be attached, ideally look like? Looking forward to your advice.

What does your contract say?..........

What does your contract say?..........

The wall was an additional request on our part. I passed that on to the builder... verbally...

The wall was an additional request on our part. I passed that on to the developer... verbally...

Then live with it and consider it a lesson learned. Sorry, but anything that is not agreed upon in writing is a free pass for the developer or general contractor to build it as they see fit (or want).

Today on the construction site I then came across a thin "little wall." Only 8cm wide.
Apart from the fact that ceiling-high is something different, isn't that much too thin?

No, completely sufficient. And then also solid.

Niche=hole??

Ask the contractor how that becomes a niche.

What should a drywall, to which a shower wall is to be attached, ideally look like?

Like any drywall looks. Stud frame made of aluminum and doubly covered with drywall plasterboard. A niche is a bit more complex to integrate.

Niche=hole??

It looked like that to me at first too :)
Later, a panel will be inserted, I don't remember what it was called, so that in the end it really becomes a niche and no hole remains.