The castle, marked as ‘Castle in Ruins’ on the 1838 Ordnance Survey map, occupies a commanding position with views stretching from north to southeast, though trees now obscure the vista in other directions. Just 50 metres away lies Castleville farm, with its traditional Irish farm buildings arranged around a walled courtyard, whilst a canalised stream runs along the northern boundary of the site.

The rectangular castle ruins measure roughly 11 by 9 metres externally, with walls that once stood at least 2 metres thick; today they survive to heights of 2 to 3 metres. The northwest wall remains the most intact, featuring what appears to be a window reveal halfway along its length and an intriguing block of masonry at its southwestern end that projects outward from the main wall line. The northeast wall has largely collapsed, leaving only the corner sections standing, though remnants of a mural staircase in the southeast angle suggest this may have been where the main entrance once stood, with the stairs providing access to upper floors.

The castle sits atop a substantial earthen platform measuring approximately 30 by 35 metres at its base, rising 2 to 3 metres above the surrounding landscape. Whilst the platform’s summit barely extends beyond the castle’s footprint on its northwest to southeast axis, it provides more generous space to the northeast and southwest. The slopes vary in character; steep drops mark the northeast and southwest sides, whilst gentler gradients lead down to the stream on the northwest and towards open ground on the southeast. Years of quarrying have eaten into the southwestern slope, creating a pit now partially filled with rubble, whilst sycamore trees have taken root at the northern and southern edges of the mound, adding to the site’s atmospheric ruins.