This rectangular two-storey building, measuring 22 metres north to south and 12 metres east to west, forms part of a larger complex of ruins. Built from uncoursed limestone bound with lime mortar, its walls feature a distinctive sloping base known as a batter, rising about 2 metres high. While most walls remain intact, the western wall has largely disappeared, leaving only short sections at each corner. The building’s eastern entrance, positioned at first-floor level, suggests this was once a hall-house typical of 13th-century architecture rather than the Knights Templar foundation sometimes claimed, though an early medieval high cross base within the ruins hints at the site’s religious significance stretching back even further.

The structure underwent significant renovations during the 15th or 16th century, when segmental vaulting was installed across the entire ground floor. This vaulting, supported by the eastern and western walls along with a newly inserted arcaded medial wall, has mostly crumbled away, leaving only fragments. The renovation also added four window embrasures at ground level; one each in the north and east walls, with two in the south wall. The best preserved northern window still shows its wicker-centred vaulting and single light opening. A narrow mural staircase, lit by two small slit windows, winds upward from the eastern side of the north wall’s window embrasure, climbing through the corner to reach the wall tops.

Historical records first mention a castle here in 1271, when it was reportedly “broken down by Hugh O’Connor” during the turbulent medieval period. The 19th century brought another wave of modifications, converting parts of the interior for agricultural use and adding a bellcote atop the north wall, typical of Georgian and Victorian demesne farmyards. During this period, the medieval window embrasures were adapted to accommodate wooden doors and window frames, some fragments of which remain visible today. The eastern wall’s exterior shows extensive repairs and alterations over the centuries, including plaster scars marking where an additional building once stood against its southern end, testament to the site’s long and varied use.