For what its worth, I kept my chickens in a 10' X 12' shed. It had a screen wall dividing it into a 3' section, to store the feed in a covered 55 gal drum and a 9' long section for the birds, accesed by a screened door. I kept a 3" thick layer of straw on the floor which kept them clean and no stink. They had 6 nests to lay eggs in and 4 long round poles on which to roost at night.
Next to the shed, I had fully enclosed, by chicken mesh, a 10' x 20' run. I also tossed some scratch into the run during the day. At night, they would go into the building and I would close the little sliding door to the run, which kept everything tight. You need the roosting poles round, about 2-3 inch diameter, to protect their feet. They will get crippled if they have to roost on the edge of a board. As soon as the sun starts to go down, they head in for the night. It's true that they establish a pecking order, with the bossier hens and rooster, getting the top most roosts, similar to what turkeys do in the wild. I changed the water everyday, using a galvanized water feeder, and had troughs for the cracked corn. You need to have the corn feeders long enough for the chickens to eat with out fighting.
I killed mine in the fall, prefering to not mess with them in 6' of snow in the winter. Fresh eggs and meat and funny to watch, with very little work.
I usually kept a dozen hens and one rooster. Too many coyotes to allow them to free range here. The will also eat garden and food scraps. For those who don't know, you don't really need a rooster, but the hens behave better and the eggs taste better.
The Hermit