 In 1927 the architects Allan Stevenson, Mair & Cassells, were responsible for further addition, alterations and a new garden wall.A category 'B' Listed Building, the date 1684 is to be found on an archway at the walled garden.Previous to the Covenanting times the open green in front of the old Hall of Caldwell was a favourite place for dance gatherings on summer Sunday evenings, with people coming from Neilston, Lochwinnoch, and Beith.