My coops are 10x10, runs 10x20. I keep mine at 10 chickens per coop or less. My chickens like to hang out in my coops, so I don't want any overcrowding. One of my coops I have 5 English Orps, and I belived that is the limit for that coop. They are so big, and it looks tight already.Wait I thought commercial standards were 2 sq ft inside and 4 outside? Either way though it's still pretty small.
ETA: Though obviously the more space the better. But I just have seen books say 2 (even the one co authored by the BYC persob) and people building coops on Craigslist claiming 3-6 birds can fit in a 3 foot x 3 foot coop, 6-8 in a 4x4 etc. And it makes me cringe![]()