Archaeological surveys from 1945 documented this granite structure, which measured approximately 9 metres by 7.5 metres and featured walls that rose to a height of around 3 metres. The building’s rectangular form was typical of defensive structures from its era, constructed from local granite that would have provided both strength and durability against the elements and potential attackers.

The castle’s architectural details, though largely lost to time, included at least one notable feature; a low arched doorway that served as the main entrance. Unfortunately, by the time of the 1945 survey, the form and design of other openings, likely windows or additional doorways, had already been destroyed, leaving only speculation about their original appearance. These openings would have been crucial for both defence and daily life within the castle walls.

Today, nothing remains of Graiguenaspiddoge Castle above ground level. The structure has been completely levelled, leaving only historical records and archaeological notes to tell its story. This fate befell many of Ireland’s smaller castles and fortified houses, particularly those that fell out of use or were deliberately demolished for building materials. The information about this lost castle comes primarily from the Archaeological Inventory of County Carlow, published in 1993, which compiled and preserved these fleeting glimpses of structures that once dotted the Irish landscape.