Hey all I am going to be building a new coop this spring. I am a little confused about how much space I need for my ladies. I have 3 chickens now but plan on getting 3 more when I build the new one. I have a production red, a white leghorn and an RIR.I plan on getting a polish, an EE, and a buff Brahma bantam. How much coop/run space do I need for 6 chickens?