The monument comprises the substantial remains of a medieval castle spanning the 14th-17th centuries, and an associated 16th-century dovecot to the E.
The castle occupies a rocky coastal promontory. Its remains consist essentially of two elements: an upper ward of irregular shape at the seaward end of the promontory, containing a once-tall tower and associated buildings, and a lower ward on the landward side, containing ranges of buildings on two or more storeys. The structures in the upper ward are very ruinous; the buildings in the lower ward, whilst dilapidated, are more entire with several stone vaults intact. The dovecot to the E is of the circular beehive type.
The area to be scheduled includes all the upstanding castle walls, the associated archaeological levels, and the dovecot, but excludes all railings and fences. The area to be scheduled also includes an area around, in which traces of activities associated with the monuments' construction and use may survive. The area measures a maximum of 120m NE-SW by 100m, as marked in red on the accompanying map.