If chickens free-range they only use the coop for laying eggs or roosting for the night - those are the two main considerations for coop space. My purchased 4x4 coop house with 4x8 run says it houses 15 hens but always figure half the number advertised by the manufacturer. Considering the amount of roost area in the coop I wouldn't put more than 6-8 medium size hens on our roost perches. It also has 4 external lidded nestbox cubicles making the total coop 4x5 with 4x8 run space below - Too cramped for day-to-day housing but adequate for hens that free-range all day.I figured it would be easier to see what I'm working with with a picture of the tree house in the daylight. We're trying to figure out a way to enclose the top level seeing as how we live in rural Alabama and predators are drawn to our 5 acres. The area in the actual tree house is 4x6ft. Would that be enough room for our 13 hens?[/URL]![]()