I think your best bet is to look at your coop size and plan your flock according to that. 8 x 8 should give you a capacity for 16 birds. That's the size of my flock. My coop will carry a bigger flock, but I don't think I'd want to. Of course those numbers will go up in the spring and summer as I start chicks and harvest old layers and roosters. But, 12 - 16 is a good winter time number for me. You might want to look into electronet fencing. It can be used during the non snow months. 4 legged beasties will only touch it once!