This bug was fixed in Patch 1.11.64
I want to place the Sauna that comes with the Spa Day game pack in the basement but that doesn’t work at all. I get the the message that it needs to be indoors.
The Sauna can only be placed if it has a ceiling. A Sauna can therefore not be placed if parts are placed underneath the garden.
Move the Sauna round so that it’s place completely underneath the house.