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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?

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    Welcome to Arqade! This is a good question, but please try using the search function before asking a new question. Don't worry, this is a common mistake many people have made before :) – two bugs Jun 7 '16 at 17:16
  • Houses can only be made of player-placed walls. You have to hammer all the dirt and snow walls, and then place some of your own – John Smith Jun 7 '16 at 19:35

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.

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