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House
A house is a safe haven for players or NPCs where they can spend their Nights without fear of attack unless a Blood Moon has risen, during which zombies can open doors.

Once your house is setup, the first NPC you meet - The Guide - will move into your house, where you will be required to either make multiple claimable levels using Platforms as access to each, add a Door and make a new room, or make a new House. Once this is complete other NPCs will slowly join you.

Requirements
By definition, a house in Terraria:
 * Has walls (including background walls)
 * Has a table and chair
 * Has a door
 * Has a light source - eg. a torch
 * A minimum height and width (respectively) of 5 blocks by 7 blocks.

Safe NPCs
thumb|right|400px|Simple tutorial to make NPC Houses.NPCs are sometimes hated because of their wandering and opening of doors and allowing enemies to enter into your home. This is a problem that is easily fixed, build a multi-tier home instead of a long spread out home. (Refer to the screenshots below in Defense) Have Wood Platforms seperate the tiers and you're good. NPC's will drop down platforms, but only if the drop is 2-3 blocks, if not they will stay (This is the same if its just the edge of blocks, if the height of the drop is more than a few blocks they will turn around) If they either spawn on your roof or on the wrong tier, unfortunately the only way to lead them to the correct room you designate is to build a literal staircase out of blocks that go 1x1 until they finally go to the right tier, and destroy the staircase. If they are on the roof, destroy the tiles underneath the NPC and they will drop into your home.

Now, if you planned out the rooms before hand without any NPCs moving in (Which is suggested, build a blueprint with dirt), when they eventually move in they will claim a room and stand in the middle of it every night, so if you want to really go in depth you can personalize the rooms to tailor the NPC in it (Signs, etc.)

Defense
A constant threat no matter how secure your home is a few things.

1) Blood Moon : Zombies and Demon Eyes will relentlessly attack your base until day breaks (Regardless of how many NPC's you have to keep enemies from spawning near your base) and they can open your doors.

2) Goblin Invasion : Not as common as Blood Moons, but still just as bad. Probably around 150-250 enemies will spawn ( Not sure what the exact number is) and attack your base, the biggest annoyance being the Sorcerer goblin who will teleport all over the place, and can shoot through walls.

Now there is actually a simple way to keep your base locked down tighter than a prison. Make only 2 entrances to your base (Via door) on either side of the base. Depending on whether or not you make towers, you can leave these doors open.

In the first screenshot you can see the doors, and how everything is completely symmetrical. Have a simple layout and add aesthetic appeal later when the functionality aspect is finished. The major defense against basically all enemies is to have some type of block that stands out from all the others, and put it above your door, then put at least 3 blocks of sand above it. You can now leave the door open almost 95% of time. (Make sure that the door is OPPOSITE of where the sand is, otherwise the sand will just land on the door and sit there)

Now this is good if you want to just sit there and wait for the event to end, but most people find that boring. So, if you have time, construct towers (this is the one thing that should be copied to the tee) that look similar to mine. Make sure to add the sand method to this as well. Make a flat land outwards from the tower (measured mine to 20 blocks out, MAKE SURE ITS LIGHTED) and then just follow the picture. If done correctly, the only enemy able to get in would be demon eyes, and thats only occasional. You should be able to move around a bit in almost complete safety and hit all enemies with ranged weapons (In the picture im using the Ball O' Hurt, originally I designed this for Arrows and the Boomerang) Any ranged weapon will do but preferably something that is quick and doesnt consume ammo is the best bet, as well as good penetration so that it will pass through many enemies at once. With this technique, the only thing that should be able to kill your NPC's are bosses, and it will also look super awesome.

If you have managed to get to the dungeon, you can actually mine the spikes with a hammer to put on your base. The spikes themselves actually do nothing, but it looks cooler.