I have finally got all the materials together to build an 8FT x8 FT coop. I wanted to get 12 Buff Orps but I'm not convinced that 64 Sq feet is enough, especially when they may be inside for days at a time in the coldest stretch of winter here in North east PA. I have plenty of room for a large run. It is approximately 50 Ft x 75 Ft (3750 Sq. Ft). What I would like to know is that enough for 12 Buffs without ever moving it. I am putting up 4 Ft fence on the entire perimeter. I would think 3600 Sq Ft would be enough that even the most active birds wouldn't tear up that much space. Thanks In Advance.