House



A Home is a structure built by the player that can serve as a spawn point for NPCs. The NPCs require an unoccupied Home before they can appear (with the exception of the Guide, Goblin Tinkerer, Wizard and Mechanic).

You can check if a house is suitable with the Housing Menu, although additional steps may be needed to place an NPC Flag.

Requirements
A structure must meet numerous requirements in order for the game to recognize it as a proper home suitable for spawning NPCs.

Size
A home needs to be at least 6 blocks tall and 8 blocks wide (or 4 blocks tall and 6 blocks wide not including walls, floor or ceiling).

Including the floor, side walls and ceiling, a home must have at least 60 total tiles, but less than 1900.

Framework


A house must be fully enclosed:


 * The side walls (vertical blocks) can be made of blocks, doors or wood platforms.
 * The floor and ceiling (horizontal blocks) can be made of blocks or wood platforms.

Entrance
A house must have at least one entrance, which can be a door in a wall or a wood platform in the ceiling or floor.

Background Wall


A house must have a background wall in order to be suitable. Any walls crafted or mined by the player are valid, when placed.


 * Walls not placed by a player (such as naturally-occurring dirt walls) do not count, with the exception of those generated in Floating Island structures, or the planked walls found in Underground Cabins.
 * Background walls may contain holes if the holes are no taller or wider than four tiles. (e.g. 4 background tiles across or tall, so the maximum size is 4x4, 16 in total. The hole cannot exceed 4x4 or 16 tiles.).
 * Walls may have multiple holes as long as they are separated by at least a single tile of background walls.
 * Having background holes will sometimes allow monsters to spawn within the Home.

Furniture
A home must have at least one Comfort item and Flat Surface item.

Comfort items
At least one Comfort item must be placed in a Home. Currently the following items may function as Comfort items:



Flat Surface items
At least one Flat Surface item must be placed in a Home, and the Flat Surface item can not be entirely placed on wooden platforms. Currently the following items may function as Flat Surface items:

Light Source
A home must have at least one light source. A Furnace, Lamp Post, Disco Ball, Glowstick and lava will not work for this purpose.

Location
If a home is located near Corruption, it may become uninhabitable. A home is corrupted based on its "Corruption Rating," which calculates all tiles in a 45-block "radius" around the house; a house's Corruption Rating must be 250 or less. Each block of ebonstone, ebonsand and corrupted vines & plants increases a home's Corruption Rating by 1. Conversely, each sunflower reduces a home's Corruption Rating by 5; and each block of hallowed grass, pearlsand and hallowed plants reduces the rating by 1.

Simplest valid option
Materials required:
 * 25 Dirt Block for floor, wall and ceiling.
 * 32 Dirt Wall (8 Dirt Block) for background wall.
 * Wood Platform (2 Wood).
 * Wooden Chair (4 Wood).
 * Wooden Table (8 Wood).
 * Torch (1 Wood, 1 Gel, results 3).

Summary raw materials:
 * 33 Dirt Block
 * 15 Wood
 * 1 Gel