Three of its four walls are now barely visible above ground level, and only the eastern wall still stands to any meaningful height, reaching about a metre. What makes the ruin worth pausing over is not what is visible on the surface but what lies beneath: a barrel-vaulted cellar that has survived intact while the structure above it has largely collapsed.

The building measures roughly 15.7 metres in length and 9 metres in width, oriented east to west. A barrel vault is a continuous arched ceiling formed from a single curved surface, like a tunnel cut in half lengthwise, and it was a common feature of Irish vernacular and semi-formal architecture across several centuries. Such vaulted cellars were used for cool storage, and their heavy stone construction often meant they outlasted the more modest walls built above them. Without more documentary evidence it is difficult to assign a precise date or function to the Flaskagh More building, but the combination of its scale and its vaulted undercroft suggests something more substantial than a simple agricultural shed.