The castle sits amongst farm buildings, with an empty farmhouse to its west, creating an atmosphere of rural abandonment. Historical records reveal that William Power transferred the freehold of Powerstown and several other lands to the Earl of Ormond in 1575 for £300, whilst the Civil Survey of 1654-6 already described it as a ‘ruinous castle’ under the ownership of Alexander Power of Tickincor.

The limestone rubble structure, roughly three storeys in height, measures approximately 6.7 metres northeast to southwest and 10.1 metres northwest to southeast. Despite its deteriorated state, architectural details remain visible: cut limestone quoins mark the north and south corners, whilst different base-batters on the southeast and northwest walls show variations in construction technique. The tower’s thick pebble-dash render conceals an older, smoother layer underneath, and ivy obscures portions of the eastern sections. A significant crack runs down the centre of the southeast wall, which branches eastward and leaves the masonry in a precarious condition; the southwest wall stands only to first-floor level with its southern end bulging outward dramatically.

The interior reveals two ground-floor chambers, each accessible from outside through separate doorways that were broken through the original walls. The northwest chamber features a stone vault ceiling showing fascinating evidence of wicker-centring in lime plaster, though a clear break indicates where the original vault collapsed and required rebuilding. This room contains an ogee-headed window, a flat-headed window, and various blocked openings and recesses. The southeast chamber houses the remnants of a stairwell in its eastern corner, where three broken stone steps project from the wall; all that survives of the original stairs to upper floors. Possible bawn wall fragments, now covered in pebble-dash, extend from the tower to connect with the adjacent farmhouse, suggesting this was once part of a larger defensive complex.