Build one, and build it bigger than you think you need. If I were to redo, I would use a shed, cut a chicken door, put up roost bars, etc. I would leave a third of it as a people only place to keep my shavings, feed, hay, and cleaning supplies in. I bought one of those small coops, built it in an hour, I still ended up having to build another coop. For starters they really are too small for more than three hens, plus the wood is thin, I wouldn't trust it for storms or predators. Now it sits in my run, no one sleeps in it, but they have laid in the nesting boxes. Chickens get addictive. I am always dreaming of expanding. Limited myself by having a coop built for the ten hens I have, instead of for the twenty five I want... Good luck!