My coop and run all together is 30Lx30Wx6H with 2 mini coop housing units on pallets inside it that are 3Lx4Wx4H, and I am putting shade netting on the top to not only keep them in, but to keep them cool. I have 45 birds all together, so hopefully that will give them enough room. Right now they are in a 40x40 with my goats, and it seems too big at times. I do know that more room seems to cut down on plucking and general smacking up of the smaller ones.