Maybe I am doing this wrong. But I have a house that has a floor, walls and ceiling. It has a door, furnace, table and chair. I accidently put the chair away from the table. Does it have to be right up against it? I can't get the chair up again. Seems like once you place a chair, it's there forever. can't even destroy it. anyway, I waited a full day night cycle. And nothing. I tried putting a sign out. Thought maybe it's how you put it "for sale". but still nothing. I don't get it.
In addition to those requirements, each NPC has specific requirements: (taken off the terraria wiki)
Merchant - Spawns when all players or the player has a combined total of 50 Silver coins.
Arms Dealer - Spawns when the player has obtained a firearm (Before he moves in, only a musket or handgun is possible to obtain.)
Dryad - Spawns when you have slain any boss monster.
Nurse - Spawns when you have extended your health, this is done using a crystal heart, found underground.
Demolitionist - Spawns when you have obtained dynamite or bombs. You do not need to use the item, just find it.
Old Man - The dungeon 'guard'. If spoken to in the day, he tells you that you may not enter the dungeon until his curse has been lifted. When spoken to at night, he transforms into the dungeon boss Skeletron.
I asked God for a bike, but I know God doesn't work that way. So I stole a bike and asked for forgiveness.
to remove furniture, just use a hammer on it. you can make a hammer with wood at a crafting bench. for background, first you must remove any existing background (probably dirt) for that, use the hammer again. After that, just look for wood wall in your crafting menu when near a crafting bench. =)
"I'm so glad you have arrived in time to die with us. We get to be smithereens together!" -Caboose
so is wood wall different from normal wood? i've just been stacking raw wood. maybe that's why. also I just want to make sure. when you said background wall, I thought you meant something literally in the background. is that what you mean? something you build that is in the area, but it's "behind" so you can walk through it? everything I build so far is in the foreground. as in, if it's in my way, I can't move through it.