I was recently playing Terraria on my laptop when I saw that this was not valid housing. Why? I might be stupid and there could just be a simple answer but do any of you know?
As pointed out in the answer of the How do I build a house for my NPCs?
- Fill in the house with background walls. Any player-placed wall will work.
The Snow background walls are not player placed, you need to replace them with something of your own.