The gatehouse in the south-east corner is square, and its vaulted passageway was originally protected by a portcullis, gate and a drawbridge. On either side of the passageway were two vaulted guardrooms, long and up to wide. On the first floor, since lost, there was a large chamber, wide, with an ancillary room, square, and a doorway that led onto some form of forebuilding or platform. The gatehouse has what architectural historian Anthony Emery has described as "flamboyant window tracing", and the Manners' coat of arms are carved above the entrance to the gatehouse.