Prior to his death, the 3rd Duke of Bridgewater had begun to demolish the medieval Priory buildings in order to build a new country house. His successor, the 7th Earl of Bridgewater commissioned the architect James Wyatt to build his new home, Ashridge House. The foundation stone for the new house was laid by the 7th Earl's wife, Charlotte Catherine Anne, Countess of Bridgewater, on 25 October 1808, the 48th anniversary of the accession of George III of Great Britain. The ceremony is commemorated by a brass plaque by the main entrance.