The Down Survey map of 1654-6 shows Creggane Castle positioned at the heart of a square bawn, a fortified enclosure typical of Irish defensive architecture. By 1659, the Civil Survey of Limerick recorded the property in the hands of John Supple, though the castle and its protective bawn were already falling into disrepair, with only an orchard remaining as evidence of more prosperous times.

The castle underwent significant transformation in the 19th century when it caught the eye of a Mr. Hutchins, who saw potential in the old fortress. Rather than demolish the structure, Hutchins incorporated it into his dwelling house, lowering its height and adding a new roof. The Ordnance Survey Letters provide precise measurements of this reimagined building: 10.3 metres by 8 metres externally, with walls still an impressive 1.5 metres thick and rising to about 13.7 metres high. The modified castle retained three storeys, with the notable architectural feature of an arched floor above the ground level, a testament to its original medieval construction.

The estate expanded around 1840 with the addition of U-shaped outbuildings to the southwest, creating a working farmstead typical of the period. These limestone rubble structures included various ranges and lean-tos that served the practical needs of a 19th-century Irish estate. A two-storey house dating from around 1790 also forms part of the complex, showing how the site evolved from a defensive stronghold into a functioning agricultural centre, adapting to Ireland’s changing social and economic landscape whilst preserving elements of its martial past.