The only physical remnants that might connect to this lost fortress are found in the existing architecture of the estate; notably, the wall of the walled garden and part of the south side of the stable yard are believed to have been incorporated from the original castle. The peculiar shape of the garden itself has led some to suggest it may follow the outline of a former bawn, the defensive courtyard that typically surrounded Irish tower houses and castles.

Adding weight to these theories is a date stone bearing the inscription “TB 1690”, which has been built into the gateway of the garden. This date would place any construction or renovation work during the tumultuous period following the Williamite Wars, when many Irish castles were either destroyed or repurposed. The initials likely refer to a former owner who undertook building work at the site during this era.

The information about Garryhill’s castle comes from the Archaeological Inventory of County Carlow, published in 1993, with updates from more recent research. While the castle itself has vanished from the landscape, its ghost lingers in the bones of later buildings, offering tantalising hints about the defensive structures that once dotted the Carlow countryside. Today, visitors to Garryhill House can still trace these architectural echoes, imagining the medieval or early modern stronghold that local memory insists once commanded this spot.