The bailey was approximately , covering an area of around , curving around the west and south side of the castle. Its earthworks were built from clay, with a rampart up to high, protected by a wide ditch, originally up to deep. The main entrance to the bailey was positioned on the southern side, and was known as Bail Gate and guarded by a gatehouse, with a subsidiary entrance on the north side, linked by a path. A break in the earthworks, now called Scotch Gap, was cut out during the 13th-century destruction of the castle, and the bank has been damaged in other ways from the installation of drainage works.