The castle, which measures roughly 9.35 metres east to west and 8.1 metres north to south, has weathered the centuries remarkably well, though not without its battle scars. Built from large, well-coursed limestone blocks with dressed quoinstones, the structure rises three to four storeys high, featuring a distinctive base batter that extends to the first floor level. Records show the tower was already standing in 1574, when it belonged to someone known as ‘Oheyn’.

The original entrance on the east wall leads into a small lobby, complete with a murder hole overhead; a rather unwelcoming feature designed to deter uninvited guests. From here, doorways branch off to a spiral staircase on the north side and the main ground floor chamber to the west. The staircase, which initially runs straight before spiralling anticlockwise from the northeast corner, once provided access to all levels of the tower, though only fragments of its steps remain today. The ground floor room, now strewn with rubble from collapsed interior walls, was originally lit by three narrow slit windows set deep into the walls, though only the southern window remains intact. A stone vault separates the first and second floors, whilst wooden floors, evidenced by corbels in the walls, divided other levels.

The tower’s upper floors reveal both its original medieval character and later modifications. The first floor features a fireplace inserted into the south wall, which rather awkwardly blocks an earlier ogee-headed window that can still be seen from outside. Windows at this level show signs of alteration too, with square two-light openings in the west and north walls missing their central mullions, and a flat-headed window in the east wall clearly inserted where an older slit window once stood. Hidden passages run through the walls at this level, including a garderobe passage along the north wall and a narrow chamber along the east wall, both lit by modest flat-headed loops. The original parapets that once crowned the tower are long gone, reportedly toppled by an earthquake in 1755, leaving the structure open to the elements but still standing proud above the Galway landscape.