Putting things up on the walls
Never drill holes on bathroom walls. That might break the waterproofing layer inside the wall structure and lead into damage caused by damp.
Walls and doors in dry rooms
If drilling holes in walls and installing any wall mounts, remember to make sure you check that the spot you have chosen is appropriate and that the fasteners and hardware are suitable for the purpose and the wall materials. If you are planning major installations such as a loft bed, check with the building manager to find out if you can install one in your home.