This circular tower house, constructed from roughly coursed limestone rubble, currently rises three storeys into the Irish sky, though it once stood considerably taller. The structure appears to have been truncated sometime in the eighteenth century, likely by the residents of a nearby Georgian house who may have found the medieval tower somewhat inconvenient to their refined sensibilities.

By the time of the Civil Survey conducted between 1654 and 1656, the castle was already described as the ‘ruines of an old castle’, suggesting it had fallen into disrepair well before the Cromwellian period. The survey records John Purcell as the proprietor in 1640, placing him amongst the last known occupants before the structure’s abandonment. The original defensive complex was more extensive than just the tower; remnants of what may have been the original bawn wall can still be traced in parts of an eighteenth century enclosure built to the south.

Intriguingly, the eastern wall of this later bawn appears to incorporate what might be a seventeenth century gable ended house, originally thatched, suggesting the site saw continued, if more modest, habitation even after the main tower fell from use. This layering of different periods of construction and occupation makes Cranagh Castle a fascinating example of how Irish fortified sites evolved and adapted through the centuries, from medieval stronghold to Georgian era curiosity.