The result is a structure that layers Tudor ambition, unfinished stonework, and later Georgian pragmatism into a single quietly complicated ruin.

The story begins with Sir Osborne Etchingham, who acquired the dissolved Cistercian abbey's estate in 1545 following the suppression of the monasteries. His grandson, John Itchingham, is credited by Robert Leigh, writing in 1684, with beginning the house, though it was almost certainly never finished in that first campaign. The outbreak of the 1641 rebellion, which convulsed landownership and building projects across Ireland, appears to have halted the work. By the time of the Civil Survey of 1654 to 1656, the Etchingham family still held the large castle at Dunbrody along with nearly all the land of the former monastic estate across the parishes of Dunbrody, Killesk, and Rathroe. The building was eventually brought to completion around 1800 by Captain John Kennedy, who served as agent to Lord Donegal, and by 1839 the Ordnance Survey six-inch map shows it as an occupied residence.

What survives today is a U-shaped structure, roughly fifteen and a half metres north to south and just under twelve metres east to west, opening onto a small internal court on its eastern side. Three of the original four gabled chimney stacks still project from the walls, and circular turrets fitted with gun-loops sit at the north-east and south-east angles of the main block, a feature more in keeping with a defended manor house than a domestic residence of any later period. The bawn, a walled enclosure providing a defended yard around the house, extends to the west, with circular corner towers at its north-west and south-west angles still standing to about three metres. A two-storey wing added in the eighteenth or nineteenth century absorbed the southern and western walls of the bawn entirely, obscuring whatever original fabric they once held. The windows and doorways visible in the surviving walls all appear to be later insertions, meaning the exterior offers few clues to the structure's earliest phase without looking more carefully at the defensive turrets and the underlying stonework.