I've read each chicken needs 4 sq ft of coop but my husband swears we can have more because they only sleep in the coop. They free range all day long (we have 5 acres for them to roam). Our coop is 6 ft wide by 8 ft deep with 12 boxes. We have 16 chickens. We live in Texas so it doesn't get too cold here so I don't anticipate them ever having to stay in there for long periods of time. Thanks!!