LoveSpreader
Terrarian
Very simple. There are two ways to go with it.How do I build a town consisting of multiple houses, where no monsters can spawn?
1. Have at least 3 NPCs nearby. Their houses should be within 30 blocks or so of each other. That should spread out the safe field. With this, there won't be any hostile mob at all, barring events.
2. Wall everything up. I suggest you use a word editor if you are going to try something like this.
Fences do work as walls, ever since 1.2.3.