Hi, I'm trying to have some comparable coops for price to see if I should build one instead. These coops I found on ebay say that they are big enough for 5 chickens. My chickens are RIRs. 2 week olds right now. I know that the coop should have 4 square feet per bird but I am having trouble calculating it correctly... Their run is 10X10 Here are the two coops: http://www.ebay.com/itm/130446062852?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 http://www.ebay.com/itm/280885927063?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 Thanks!