I have no run my chickens just free range and I have yet to loose one to predators. I built this coop for a total of 10$ all else was recycled wood I got from a local hardware store.
It is 6x6 and has a pallet base with plywood flooring. The walls are from a small shed and I used 1x10 panels for the outside walls. I am getting windows in the spring right now it is just poly but there is a 6"x 4' vent on each side lined with the screen out an old door
The roof is shingled I found 2 half bundles at the hardware in there scrap pile and all I had to buy was the roofing nails and the 4" nails for the base