We got a large used dog house through our local weekly paper that was advertised as free. We insulated it, added exterior nest boxes and created a door for the hens. We also removed the entired front and put it back on with hinges so it can be dropped and the entire thing cleaned out very easily. Then we fenced the whole thing in for when the girls aren't free ranging. We've only got three hens at the moment but we're thinking of raising chicks this spring and will need more space. We'll leave the older girls in their dog house and convert half the large garden shed for the new chicks.