Describe 'Round Barn coop' here This coop is actually a replica of an "octagon barn" from Sauk County, WI. The base is 4' x 4'. The coop has 8 sides with a door on each corner. It has a chicken ramp in the floor to let the birds access the run area under the coop. The coop has glass blocks for windows, a working cupola for ventilation, and shingled roof. Nest boxes and storage area on one end of the coop.