There are many definitions of a "coop", so therefore there are no hard numbers on design capacity. The numbers that I use on my own coops come from years of raising chickens. My 6x14 will carry 15 large hens to 20 bantam hens with no problem. The key is how often it is moved by the purchaser. The upper house adds more sq. footage than just the 6x14 footprint. So when using 4 sf. per chicken know what type coop it refers to.

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