This four-storey rectangular tower, measuring roughly 8.85 metres north to south and 9.8 metres east to west, was once part of the lands of Dysert, also known as Díseart Muirdeabhair. Historical records trace its ownership through various hands; from Morris mac Tirrelagh Mac Moryertagh O’Brien who held nearby lands in 1584, to Sir Edward Wingfield who possessed ‘Craige and Dissarte’ according to the 1654-56 Civil Survey of Limerick, which noted the presence of a castle and 72 Irish acres.

The castle’s defensive features reveal the concerns of its medieval builders. Entry is gained through a flat-headed doorway in the centre of the west wall, leading to a lobby area protected overhead by a murder hole; a 1.3 by 0.3 metre opening through which defenders could attack unwelcome visitors below. A spiral staircase of sixty-eight steps winds upward from the northwest corner, providing access to all four floors. The ground floor chamber, with its stone vaulted ceiling still bearing traces of plaster, is lit by narrow slit windows with distinctive double splays that allowed defenders to watch approaches whilst minimising vulnerability. An intriguing feature is a mysterious intramural chute in the southeast corner, accessed through a hole in the wall, which may have served as a secret chamber.

The upper floors reveal both defensive and domestic arrangements typical of tower houses. The first floor features larger windows set into tall embrasures, an L-shaped mural passage hidden within the thickness of the east wall, and an aumbry or wall cupboard for storage. The second floor, also stone vaulted with traces of wicker-centring still visible, once connected to a garderobe tower at the southwest angle, though only a fragment of its east wall survives. The third floor boasts elegant twin-light and single-light ogee-headed windows, architectural details that date the structure to the later 15th century. Curiously, small holes near one of the windows suggest the castle was repurposed as a dovecote in later centuries, whilst the ivy-covered limestone masonry and prominent base batter, though robbed at the corners, continue to stand as testament to the skill of its medieval builders.