Watchtower at Fonmon Castle

Built of local roughly coursed limestone rubble, which has been lime-plastered at some time on the lower part and is partly rendered. Tall narrow rectangular tower with battered base. Four storeys, but built into the bank so that only the first build has the additional under-storey. The first floor has a square headed modern opening on the land side (north). The second floor has a pointed arch door into the dovecot, slit vent to right and another to rear. c2000 oak window with lintel above on north side, this is for the doves. The original build has a blocked window above the slit vent, which lit the third floor. Above this is an additional room (see History). Machicolations on the long walls only, square headed window on north, 2-light window on west, blind on east and south (but see History). Castellated parapet, the roof has gone.

Interior not available at resurvey. It is said to be largely featureless except for the still in-situ central wall and the remains of good quality lime plaster in the topmost room.