Terraria NPC happiness and housing explained

How happiness works

Terraria does not show you a happiness score. Instead, every town NPC carries a set of multipliers that are applied to shop prices the moment you open their dialogue window, and the shop interface shows a small icon summarising the result. Move an NPC, move the player, or change who lives nearby, close the window and open it again, and the numbers change immediately.

Three things feed into it:

• Biome. Where the player is standing, not where the NPC lives.
• Neighbours. How many other NPCs are within the crowding radius, and how the NPC feels about them.
• Situation. Whether the NPC actually has a home, and whether that area is somewhere they refuse to live.

Price corrections are multiplicative and rounded to the nearest 1%. The best and worst outcomes bracket a wide range: the cheapest purchases reach 75% and the best sale price reaches 133%, while the worst case is 150% purchase and 67% sale.

Price multipliers

Two rules catch people out. First, biome preference is read from where the player stands — you can move an NPC to a liked biome and still pay a penalty by standing somewhere they hate. Second, in a mixed biome the loved and liked biomes take priority over the disliked ones, so a badly placed house is not automatically punished.

Building a valid house

A house is an enclosed room with player-placed background walls and at least one piece of valid furniture, and it has to be somewhere the NPC will accept. Two town NPCs cannot share one house, though a town pet can share with an NPC.

Two 1.4.5 changes are worth knowing:

• Houses no longer require at least one solid, non-platform block to be valid. If you previously built a floor of platforms and could not get a house to register, that is no longer the blocker.
• The housing query now gives visual feedback on whether a space is suitable, and tells you specifically when a house fails because there is nowhere to stand.

Rooms too close to Corruption or Crimson can still cause residents to leave, which connects directly to the biome spread page.

How villagers arrive

Before 1.4.5, an NPC could only move in if a valid empty house already existed. That is no longer the whole rule.

Two related 1.4.5 adjustments:

• A homeless NPC now shows a Housing dialogue option instead of Happiness, containing instructions on building a suitable house. If you cannot find the happiness dialogue on a new arrival, that is why.
• Villagers now take priority over town pets when respawning, and an evicted villager waits about a minute before looking for a new house.
• The Party Girl’s move-in requirement rose from 14 to 20 villagers, to account for town pets and town slimes.

Because a house is no longer required to make contact, you can meet a new NPC before you have anywhere to put them. If you want them to stay, have the room ready the same day.

Happiness and pylons

Happiness and pylons used to be tightly linked and now are less so. A pylon teleport requires at least two housed NPCs living near the pylon, but since 1.4.5 the minimum happiness requirement for an NPC to sell a pylon has been removed entirely. Full pylon rules are on the Shimmer and pylons page.

The practical summary: build a valid house near each pylon, make sure two NPCs actually live there, and worry about their personal biome preferences second — those change prices, not whether the network works.