Surcharge for floor-to-ceiling tile

A little tip on the side: If possible, remove the bathroom story, go to the next tile studio at a good building materials dealer (e.g. König) and get expert advice there, it costs nothing and doesn’t hurt. Buy the materials there and have yourself referred to a tiler who works with the studio...

Not so naive hehe. It is always better not to be naive - then you don't believe everything...