When I was growing up in the 50's folks kept chickens in whatever space was available. My paternal grand parents kept hens in a old layer house designed for three times as many birds as they had. My maternal granddad kept a dozen in an old horse stall. When I bought my dozen pullets I had in mind to use a old 6 X 9 garden shed. I added interior sheathing, a window, pop out door, ventilation, and a 7 X 7 run. Then I found this site and a lot of good advice telling me that my housing was too small. Since my plan was already in motion I stayed with it figuring I could sell, eat, or give away a few if crowding became a problem. I am happy to report that my flock is doing well and producing 8 to 10 eggs each day. I have 0 pecking or egg eating problems. They are shut in the coop from 5 PM-around 7 AM the lights are on a timer and come on at 3 AM and they lay most of their eggs before 8 AM, they have access to the small covered run the remainder of the day and are allowed to free range for 1-2 hours before dark if the weather is fit. My coop has over double the roosting space on the top roost as necessary plus a smaller low roost. The nest is large dark and communal with no dividers. The house is kept well bedded (I just keep adding and will clean it out in the spring). The nest box gets fresh shavings weekly and there is always feed and water available. My conclusion is if everything else is in order some minor crowding is not a big deal.