The rectangular limestone tower house, constructed from roughly coursed rubble with dressed corner stones, once stood as a formidable three-storey structure measuring approximately 8.2 metres north to south and 7.6 metres east to west. Today, only partial remains of the western and southern walls survive, rising to about 13 metres high, with walls nearly two metres thick and featuring a distinctive base batter that extends just over two metres up from ground level.

The castle’s internal layout reveals the typical arrangement of an Irish tower house, with a barrel vault separating the ground floor from the first floor, whilst the upper levels were supported by wooden floors, evidenced by the large joist holes still visible in the western wall. The main hall, situated above the vault, was clearly the castle’s showpiece chamber, featuring elegant twin-light windows with ogee-headed arches set into both the south and west walls. Though only the southern window partially survives, it still shows traces of decorated spandrels, whilst fine arcading adorns the inner face of the western wall at first-floor level. The defensive features included a wall-walk supported by corbels and a bartizan at the southwest corner, though only the supporting corbels remain today.

By the time of Cromwell’s Civil Survey in 1654-6, the castle was already described as ‘one small castle wantinge repaire’, owned by Connor O’Dwyer of Ballagh and accompanied by four cabins. When the Ordnance Survey examined it in the 19th century, they recorded that the north and east walls were already missing except for a portion of the southeast angle, which included a pointed doorway. Since then, further deterioration has claimed the southeast corner and eastern doorway entirely. The surviving structure still displays various architectural details including double-splayed windows at ground level, flat-headed windows on the first floor, and multiple wall niches that would have served as storage spaces or perhaps held candles to light these now roofless chambers.