Rising four storeys high with walls over two metres thick, the tower measures 11.4 metres east to west and 9.35 metres north to south. Despite significant damage to the western wall and third floor, the structure retains many of its original defensive features, including a distinctive base batter that would have made scaling the walls particularly challenging for would-be attackers.

The eastern entrance showcases the castle’s sophisticated security measures, featuring a two-centred arch with carefully dressed jamb stones and a yett hole in the southern jamb that once secured a heavy iron gate. Just inside, visitors would have faced a murder hole overhead whilst the lobby branched off to spiral stairs in the southeast corner and a guard room to the northeast. The ground floor, accessed through another two-centred doorway, features narrow slit windows with pivot holes for shutters; their sills cleverly rebated to allow wooden shutters to sit flush and prevent draughts. The internal layout reveals a vertical arrangement of chambers connected by the spiral staircase, with timber floors supported by visible joist holes on the lower levels and a barrel vault crowning the second floor.

The castle’s domestic arrangements are evident in the remains of multiple garderobes, essentially medieval toilets, positioned in the southwest corners of various floors with their chutes still visible. The first floor once boasted a large fireplace in the north wall, whilst a mural passage in the south wall led to one of these private chambers. Windows throughout range from simple slits to a more elaborate ogee-headed opening in the northeast corner, complete with decorative hollowed terminals. Perhaps most intriguingly, the exterior southeast corner stone bears a sheela-na-gig, one of those enigmatic female figures found on medieval Irish buildings, adding an element of mystery to this already fascinating fortification.