The Castle House, Castle Street, Dingwall

The monument to Roderick Maclennan is located at Dingwall Castle on Castle Street and dates back to 1821. It is a square castellated house with two storeys over a raised basement, featuring three wide bays. The structure is built of rubble with tooled ashlar dressings. The centre bay is slightly advanced, and it includes an advanced porch with angle pilasters connected by a low cast-iron balustrade. The entrance is round-headed with a recessed panelled door, and there is a round-headed window in the centre of the first floor with multi-pane glazing. The house has 12-pane glazing elsewhere, although some windows are blind. Each floor has two windows, and there is a wide chimney breast on the return elevations. The corners of the building feature coped angle pilasters, and the coped end stacks rise above the wallhead, which is incorporated with wallhead crenellation. The roof is a piended platform covered with slate.

Inside, the house retains its original staircase, chimney pieces, door pieces, and plaster ceiling cornices. The monument itself, designed by Hinchliffe from Hampstead Road, London, consists of a square marble plinth set on a two-stepped square platform. Each face of the plinth has cusped panels, with an inscription dedicated to Roderick Maclennan and a carving of the brig "Dart" from 1805. The site is enclosed by a coped rubble garden wall.