Mansion House, Comlongon Castle

Comlongon Castle is a large, rectangular-plan tower house from the 15th century, located at the west end of a mansion house built between 1900 and 1902 by architects James Barbour and J.M. Bowie from Dumfries. The tower house has five storeys and is constructed from rubble with ashlar dressings. It features a round-headed door with a yett at the east end of the north wall, small mostly square-headed openings, and larger openings that have iron grilles. The building has a splayed base course and a corbelled and crenellated parapet that encloses the roof, connecting to a crow-stepped cap house over three angles.

Inside, there are many passages, chambers, and presses within the wall thicknesses, along with a carved stone chimney-piece on the first floor. To the west, there are outbuildings linked by a crenellated wall. The 20th-century house is mostly three storeys and echoes features of the tower house, with an asymmetrical design that includes extensive use of corbelling and crow-stepped gables. It is also rubble-built, with contrasting pink ashlar dressings. The north-east corner features a round-headed doorway, and there are north-facing mullioned and transomed windows alongside a loggia to the south on blocked columns. The building has coped stacks and slate roofs.