I would say 3 really, as it is only 6ft by 2ft, but maybe a max of 5 at a push, the indoor sleep area is pretty big and as they like to snuggle loads of room. I have other plans for mine just waiting to get more cash together. going to make a secound level on the open side and make a dig box with a man hole dug into it for anouther nest box. when its done il get pics and start my own thread.