Full of Amenities - Backyard Chicken Coops - Southernliving. Carolyn Llorens, an architect, designed this 8- by 6-foot coop and the 8- by 12-foot run. The coop door is 18 inches off the floor so the chickens don’t all run out when the door opens. An egg door allows easy access to nest boxes. Heating pads keep the girls warm in winter, and hardware cloth sunk into concrete keeps out predators.