The barn is 110 feet long and 30 feet wide, with two projecting hip-roofed entrance bays on the south side, facing the farm yard. The building has a thatched roof and weather-boarded exterior. It is built of oak timber on eight bays. The roof is constructed so that the interior of the barn is a single open space, with no supporting columns. The roof structure has long queen posts connected by two collar-beams. The principals only reach as far as the queen posts; that is, they do not meet at the roof's apex, leaving the top 7½ feet of the roof to be only constructed of thin common rafters. These common rafters are attached to the principals by the trenched purlins.