The house was built for Mary Pickering on the site of, and incorporating part of, an earlier building called Kincardine Lodge, dating from around 1780.
Webb later went on to design notable London buildings including Admiralty Arch, The Mall and the principal facade of Buckingham Palace.
Herbert Hardy Wigglesworth[3] trained in Aberdeen under Alexander Marshall Mackenzie before moving to the London office of Ernest George and Peto.
The entrance tower hints back to the 14th century keep with its plain rendered walls, battlements and cap house.
At the heart of a 3,000-acre (1,200 ha) estate, the castle is not open to the public, but serves as a venue for meetings, private dining, marquee events and weddings.