We built a smaller pen off one side of our hen house. You can use scrap lumber if you have any laying around. Used regular field wire for fencing, and reinforced with 3 foot high 1 inch chicken wire at bottom to keep them from getting out. You can use cable ties to connect the two layers of fencing. Of course you gotta put a roof, to keep out predators, but it doesn't really take all that long to build, and is worth it. Our 2 teenage girls helped us, and we made it a family adventure. An old screen door is a cheap way to go on a door. Just put latches up top and on the bottom. Keeps it more secure. Oh, and we were able to do it all in one afternoon.