The castle’s location would have provided its inhabitants with excellent visibility in all directions, a crucial defensive advantage during turbulent times. Historical records from the 1655-9 Down Survey indicate that the lands of Brockagh belonged to Andrew Tuite in 1641, placing the castle within the context of pre-Cromwellian Irish landownership.

Today, only fragments remain of what was once a rectangular tower house measuring approximately 11 metres east-west by 7 metres north-south. The structure was built from roughly dressed mortared limestone with a slight base batter, and notably featured rounded corners similar to those found at nearby Carrick Castle. The most substantial surviving element is the three-metre-high southwest wall, which contains a single centrally placed window. The rest of the castle’s outline can still be traced through low, grass-covered wall footings that mark where the other walls once stood.

The castle sits within a sub-circular enclosure, though this feature appears to be a later addition; it doesn’t appear on the 1837 Ordnance Survey map when the castle was still shown as an upstanding structure, but is clearly visible on the revised 1911 edition. By that later survey, the castle had already fallen into considerable ruin, with only the southwest gable still standing. The rectangular building was aligned northeast-southwest, and aerial photography from the Cambridge University Collection reveals the ghostly outline of the enclosure surrounding the castle ruins, adding another layer to this site’s complex history.