 Probably in the 1360s, the Sibbalds built a barmkin, or fortified courtyard, with a tower house at the north-west corner.The lands and the castle were left to a daughter, who married Sir Robert Lundie, who extended the castle in 1496, following his appointment as Lord High Treasurer of Scotland.Sir Robert built a two-storey range of buildings to the east of the keep, enlarging the accommodation with a long hall and a solar.