The castle is still occupied. 
The Wallaces of Sundrum, descendants of Sir William Wallace owned the property from 1385, but it passed by marriage to the Cunninghams in 1400. The Cunninghams were members of the Baronetage of Nova Scotia between 1669 and 1829. The castle was included in the refurbished mansion in about 1829. 
The original castle had a massive keep with a small stair-wing and a larger wing built later.
The walls of the current dining-room correspond to the original keep.
The principal façade is now dominated by a four-storey centre tower, which has a parapet and machicolations. There are square-headed drip moulds. Corner turrets are square; there is a porte-cochere; the building stands on a terrace, with round corner bastions. The internal hall and staircase have plaster ceilings and other Gothic decoration.  The owners possess drawings of the castle prior to the modernisation.
It is a category A listed building.
- Coventry, Martin (2001). The Castles of Scotland. Musselburgh: Goblinshead. p. 101 ISBN 1-899874-26-7
- "Canmore". Royal Commission on the Ancient and Historical Monuments of Scotland. Retrieved 2016-09-19.
- "British Listed Buildings". British Listed Buildings. Retrieved 2016-09-22.