hi, we have 12 barred rock chicks and hubby build them a 4'x4'6" coop we originally made 8 nesting box (4 wide by 2 high) but learned that we don't need that many box because more then one use the same box. so if we take down all the dividers for the bottom, it gives them 4.5' x 4' of floor space. hubby was planning to build a 8'x4' run. and we'd move the coop and run around the yard every 2 days. now that i read that each chicken need 4 sf if they go out or 10 sf if they stay in coop... it look like we won't be able to keep our dozen chicken we had planned to put the coop and run in the garage for the winter... it's a double garage with only one garage door opening but no door on it and we never bothered to install a new door on it. we don't use the garage for our car. just lawn tractor and snow blower. how many chicken would you keep? half of them might be roosters.