Rule of thumb is a minimum of 4 square feet per bird-please allow more square feet if possible--so for 6 chickens it's 24 square feet, 4 hens to a nesting box and a minimum of 5 inches of soft litter to land in. You can grap a little more feet from either mounting the roosts with dropping boards over the nesting boxes, or I have the nesting boxes and roosts resting on cinder blocks--so the girls can use more floor space. I'm wanting my husband to change the nesting box from 4 in a row to 2 over 2--Somebody keeps laying eggs every once in a while under there and I don't like getting into the litter to reach for eggs! Read the thread about barn fire safety before you use the other side for any kind of storage other than feed.oh good one - putting the roost away from the wall for poop reasons - admittedly I had not even thought of that - I am in the planning stage I have been searching and researching - there is a 12x16 building on my hubby's newly acquired land it sure looks like a chicken coop to me - the fort Knox construction got that idea and will be doing everything I possible can. I'm not sure how much room let's say 6 chickens would need? I was thinking splitting the building in half - half coop - half storage. They will have a large run , half-hard covered and halve open but netted. Any input would be appreciated