My coop is 12x8 and I have had up to 40 in there at once. I did have to whittle down the number of roosters I had though, which brought my total down to 32 chickens in there at once. I figured since I free range them, 3 sqft/bird was plenty. I do not tolerate aggressive animals, no matter what...
my coop is 8x12' I wish I had built it a little bit bigger. I made a 600sqft attached fully enclosed run too. I built it on a concrete slab for ease of cleaning.
Outside, when I was just about finished, notice I just attached it to a pre-existing loafing shed.
inside looking at where I put the...