How big Is Big enough to house 21 Yard Birds. Im about as Green as the grass grows to chickens and building. It started to be my kids Playhouse But things do change. Kids didnt mind at all when I said chickens.. ;-) It is about 10 X 14 with the nest boxes outside. since i'm a New egg I was able to make a page but i'm still on probation cant put pictures on posts. I was told to make it bigger than you intend to build. so I went with it.. but is it really big enough for 21 chickens? I did make a Chicken coop Project page hope everyone is able to view it. I just became a member but i have been viewing for quite some time. and Everyone gave me inspiration. also since i am going with a dirt floor what is the best way to keep out like Everything? Thanks..