i built a coop that has a run in the bottom and a roost box that is 3 feet off the ground in the back top corner. so the run where the grass is is 30 sq ft. and the roost box is 13 sq ft. How many hens can i have. I hope you say nine because that is what i got. I built coop thinking 4 sq ft per bird was for roaming area not roosting area. I have 3 each of americanas, black australorps, & dominiques. i live in city and don't know if i can let them out during day because all i have is chain link fence around yard.