Building my first chicken coop for my first flock of chickens, I've done tons of research on coop sizes and from what I've read I need the following... 4sq ft per bird 1 nesting box per 4 birds 18" of roost space per bird. Currently I have a dozen chick's of various breeds (no bantams) so according to everything I've read I need a coop that's 48sq ft and 4 nesting boxes, and 18 feet of roost space. So far the coop is coming along nicely, expecially considering I've never built anything that didn't come in a box from a store with instructions in 4 different languages. However looking at what I've got so far, it seems awfully big. Coops I see being sold online, and the ones I see in the store seem to have much less floor space per bird. My chickens will have a large yard to roam in, and a coveted run as well (25 sq ft per bird), so the coop is just a place to sleep and plop out eggs. Even during the winter I will have a covered and enclosed run area for them, So with that in mind, how big should my coop have been, and how many birds will the one I'm building hold?