Following the growing popularity of Scottish Baronial architecture, the 7th Duke commissioned the Edinburgh architects David Bryce and William Burne to remodel the exterior of the castle in the 1860s/70s.
Crenallations and turrets removed during the Georgian period were reinstated, a new entrance hall was erected and a ballroom added. New gates were installed and the latest services including bathrooms, telephones and gas were introduced for the first time.
During the Great War the castle was used as an auxiliary hospital and from 1922 the family found it more convenient to live in the private apartments.