I have been researching how big to make my coop. I may be "over researching", something I do ALL the time. One school of thought is 2 sq. ft. per chicken; then another said 4sq. ft. I have 6 chickens (2 Red Star, 2 Marans and 2 Barred Rocks); I live in S.E. Pennsylvania. They will have a 100 sq. ft. run attached to the coop and a fenced in yard that is 3,000 sq. ft. for "ranging". I am worried that when the winter is too harsh to go out in the run, they may get a little "hen pecked", pardon the pun, cooped up in their coop (I'm just a pun a minute!). I already had the plans drawn and materials purchased and then I started to second guess myself. I would love to know if I should make the coop larger? The original design is only 3' by 6'. The new design I'm working on would be 4' by 8', almost double the square footage. Any suggestions?