I just built big to start with. My standard laying/breeding flock is one rooster and 7 hens in an 8' x 12' coop and 12' x 32' run, but they free range most of the time. I currently have 29 chickens of various ages, mostly too young to eat right now. I eat them as I go along. I'll be back down to my standard laying/breeding flock next spring but probably not before I hatch some more. It's a never-ending cycle.