I was told by an old timer with 40+ years of raising chickens to use 4-6sq.ft. per bird in the coop and 10 sq.ft. in the run or as much room as you could possible provide. One old timer in reference to areas where they have snow or inclement weather in the winter said: Imagine you and your...
In answer to your question about space: You need 4-6 sq.ft. per bird in the coop and 10 sq. ft. per bird in the run. That is for regular size chickens. You can go less for bantams, but I don't know how much smaller.