This small tower house, typical of the defensive structures built by Gaelic and Anglo-Norman families across Ireland, would have served as both a fortified residence and a symbol of local authority. The castle's compact design features the characteristic elements of Irish tower houses: thick limestone walls, narrow window openings, and a rectangular footprint that maximised defensive capabilities whilst providing living quarters for the local lord and his household.

The castle's strategic position in the countryside around Moycola would have allowed its inhabitants to oversee agricultural lands and maintain control over local trade routes. Historical records suggest connections to various prominent Galway families, though the exact sequence of ownership remains somewhat unclear. Like many Irish castles of its type, Moycola likely witnessed centuries of changing fortunes; from medieval prosperity through the upheavals of the Cromwellian conquest and the Williamite wars, eventually falling into disuse as more comfortable Georgian houses became fashionable amongst the landed gentry.

Today, the castle ruins offer visitors a tangible connection to Ireland's turbulent past. Though partially collapsed and overtaken by nature, enough of the structure survives to appreciate the skill of its medieval builders. The remaining walls, some reaching up to four storeys in height, showcase the murder holes, spiral staircases, and defensive features that were once common across the Irish landscape. For those interested in medieval architecture and local history, Moycola Castle provides an authentic, uncommercialized glimpse into how minor nobility lived and defended themselves in medieval County Galway.