The rectangular enclosure measures 84 metres east to west and 83 metres north to south, surrounded by limestone rubble curtain walls that rise to approximately 5 metres high. Circular flanking towers once stood at each corner, though only traces of foundations remain at the northwest. The site can be entered through a wide breach in the southern wall’s western end or via a narrow arched gateway inserted near the northern end of the western wall.

The defensive nature of this structure is evident in its numerous gun-loops, which pierce both the curtain walls and towers. These loops feature splayed and lintelled embrasures with rectangular shot holes measuring roughly 5 centimetres wide by 8 centimetres high. The southeast tower, with an internal diameter of about 4 metres, remains the most intact; its ground floor doorway once provided access from within the bawn, and large joist sockets indicate where the first floor would have been. Whilst the southwest tower has partially collapsed with its entrance blocked, the northeast tower can still be accessed via inserted steps, despite also being in a state of partial ruin.

Historical records suggest this site has a much older pedigree than its 17th-century fortifications might indicate. The 1842 Ordnance Survey map shows a rectangular feature projecting into the interior from the western curtain wall, marked as ‘site of Clonmeen Castle’, though this had vanished by 1897 and leaves no visible trace today. Foundations of thicker walls beneath the northern and eastern bawn walls, as well as under the southeast tower, may be remnants of a 14th-century castle that belonged to Philip O Mol. The castle later became one of the principal strongholds of the O’Callaghans before being ruined during the wars of 1641, after which the O’Callaghans forfeited the property.