This four-storey limestone tower house, measuring roughly 12 by 10 metres with walls over two metres thick, dates back to at least the mid-16th century. The Calendar of Ormond Deeds records that between 1547 and 1584, Thomas Earl of Ormond granted these lands, including the castles of Ballyquirke and Laghensy, to one Bryen O’Kennedy of Lackyne. By the time of the Civil Survey in 1654;56, the structure was already showing its age, described simply as ‘ye castle of Ballyquirke the walls only standing’, with the Countess of Ormond listed as its proprietor.

The castle’s defensive architecture reveals itself through careful examination of its remaining features. The original entrance, now obscured by fallen rubble from the collapsed eastern wall, was a two-centred doorway that opened into a lobby protected by a murder hole above; a grim reminder of the structure’s military purpose. From this lobby, visitors could access the ground floor’s main chamber, the guardroom in the northeast corner, or climb the mural stairs to reach the upper levels. The ground floor chamber, lit by narrow slit windows set in arched embrasures, still shows evidence of wicker centring used in its construction. Fine punch-dressed limestone doorways, likely dating to the 16th century, can be found throughout the structure, whilst the third floor retains its barrel-vaulted ceiling running north to south.

Despite its martial origins, Ballyquirke Castle has seen more peaceful uses in recent centuries. During the 18th or 19th century, significant modifications were made including the insertion of timber floor joists, a fireplace in the western wall, and even a sash window on the second floor; rather unusual additions for a medieval fortification. According to local tradition, the tower house found new purpose in the 19th century as a cider-making facility, transforming this once-formidable stronghold into a productive part of the rural economy. Today, whilst partially ruined with its eastern wall collapsed and interior filled with rubble, the castle remains an evocative reminder of the complex layers of Irish history, from medieval warfare to agricultural innovation.