we used a 10'x10' dog pen with screening on top as a chicken run & a dog house as the house, when we had 4 hens & 1 rooster. Now that my granchildren love watching them so much, we now have 20 hens. We converted the chain link pen into their house and the dog house into the nesting box (also used covered cat litter boxes as nesting boxes, portable & easier to clean). We put the nesting boxes on a stand & their roost under it. In the winter we put up plywood completely around the pen & wrap it in tarps. For the roof we put up that wavy plastic that they use for decks or porches. Plan on a real roof next yr. I jam in strips of foam to fill in cracks at the top to protect from drafts. In the late spring, summer, and early fall we take off the plywood & tarps and they have good ventlation on the humid MO summers.