The building itself tells a story of architectural evolution; what began as a two storey structure with notably thick walls later saw the addition of a third storey constructed in brick. This layering of construction periods offers visitors a tangible connection to different eras of Irish building traditions.

Within the pub’s walls lies a particularly intriguing piece of history: a section of wattle partition that was carefully removed from a first floor wall and preserved on the premises. Whilst this woven wooden framework could potentially date back to the seventeenth century, researchers including Bradley and colleagues noted in 1985 that its exact age remains unconfirmed. Such architectural fragments are rare survivals that provide valuable insights into traditional Irish construction methods, where wattle and daub formed the backbone of many buildings before more modern materials became widespread.

Perhaps most impressively, Sean’s Bar maintains documentation tracing its innkeepers from 1600 onwards, creating an unbroken chain of proprietorship spanning over four centuries. This continuous record offers historians and curious visitors alike a unique window into the social and economic life of Athlone through the ages, from the plantation era through the Georgian period, the Great Famine, and into modern times. The combination of physical remnants and written records makes this pub not just a place for a pint, but a living archive of Irish social history.