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Villages. Can someone legitimatly expand a village by building more houses for villagers (Testificates) to breed and fill? Would these houses have any conditions to be met beyond a roof and a door?

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This question has an open bounty worth +50 reputation from Ender ending in 4 days.

The current answer(s) are out-of-date and require revision given recent changes.

Minecraft has come a long way, these answers should move along with it. Somebody should do that.

up vote 9 down vote accepted

Yes, this is entirely possible. I keep meaning to do it myself, but haven't gotten around to it. Villagers will breed until there are .35*[number of doors] villagers. To be defined as a house, the building must have at least one block with no opaque blocks blocking its view of the sky.

Source

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It should be mentioned that houses require sunlight now. In previous versions all you needed was a door with a roof. It's mentioned in the wiki link above. – Dycker Sep 13 '12 at 20:15
    
@Dycker - Oh, I forgot about that! Adding that now. – SaintWacko Sep 13 '12 at 20:52
    
The answer entirely lacks the "willingness" mechanics. Without triggering it, be it by trading or supply of food, the population can only double. – SF. Jun 23 at 18:53
    
That wasn't introduced until two years after I posted this answer. I'm not very familiar with the mechanic, but if you are, please feel free to edit my answer. – SaintWacko Jun 23 at 19:04

The amount of villagers depends on the amount of doors. You must place the door with an "inside" and "outside". You will need to place a block next to door to count as a roof. Then you will be able to breed villagers.

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As of 1.8, villager mechanics are changed, to where you can still build houses the same way as before (a door and a block at least 5 blocks behind it, you can put extra doors in between) but the villagers will not breed until the are "willing." You must trade with a villager until green particles appear, and then do it again for a nearby villager.

So, the answer to your question is yes. It just takes a lot of resources and time.

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Villagers will only breed when they are "willing". This can be achieved through trading and by ensuring they have lots of food (either 3 bread, 12 carrots, 12 potatoes, or 12 beetroots in one stack in their inventory). After mating, they will no longer be willing, and must be made willing again. All this is trumped by the door rule - villagers will mate until the number of adult villagers equals or is more than 35% of the number of doors in the village. "Villager generators" still work in 1.10.2 though, what I normally do is surround a farm (garden,field) with doors and then place a block above each door on the "inside" of the farm. I have a village with 12 naturally occurring doors as well as three of my generators and my village population currently includes 12 adults, four children and an iron golem.

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