What remains of this once-imposing tower house is primarily its western wall, now draped in ivy, which still features an intact chimney stack and fireplace. These remnants hint at the domestic life that once filled these stone chambers over 400 years ago.

The castle walls hold intriguing clues to its past inhabitants and their beliefs. An armorial stone on the southwest side displays two letter ‘H’s positioned above what appears to be a Freemason symbol, accompanied by the inscription ‘ANOD 1610’. Another stone, though its current whereabouts are unknown, once bore the defensive motto ‘GODS STRENGTH IS MY DEFE..CE 1625’ above three Freemason symbols. These markings suggest the castle’s owners were not only people of faith but possibly members of the early Masonic movement in Ireland, a fascinating connection given that organised Freemasonry wasn’t formally established in Ireland until the 18th century.

By the time the Ordnance Survey documented the site in the 19th century, Grangecon Castle was already described as being in ruins, a state recorded in O’Flanagan’s OS Letters from 1928. Today, these weathered stones continue to stand as silent witnesses to Wicklow’s complex history; a place where religious devotion, defensive architecture, and mysterious fraternal symbols converged in the early days of the 17th century.