North Gate-Lodge, Dundas Castle

North Gate-Lodge at Dundas Castle is a single-storey, three-bay Tudor Gothic lodge house designed by William Burn around 1820. The building features a principal range with an advanced open-pedimented east gable and a canted west gable. The main elevation faces south, showcasing an asymmetrical design with an advanced gable on the left and an entrance porch set in a re-entrant at the center. The lodge is constructed from stugged and polished sandstone ashlar, with a battered base course, moulded reveals, and hoodmoulds over the windows.

On the south elevation, there is a six-light mullioned and transomed window that centers the advanced gable on the left. The entrance door, which is panelled and gothic-glazed, is located in the central bay and is sheltered by a stone porch featuring a square column with chamfered arrises that supports a Tudor-arched corniced stone canopy. To the right, there is a two-light mullioned window.

The east gable has an open-pedimented design with a two-light blind window featuring a sloping cill and gothic tracery at its center. The west gable is asymmetrical and canted on the left, with pointed-arched windows on each face, and a three-centre-arched window on the side of the south gable to the right.

The roof is covered with grey slate and is piended at the canted west end and flanking the east gable. The chimney stacks are made of stugged sandstone ashlar, with corniced bases and circular cans; the west stack has a single flue that pierces the canted roof, while the principal ridge features a two-flue stack that is shouldered, with canted ends and incised arrowslit decoration on the shaft.

The property also includes ornate wrought-iron principal gates and square sandstone ashlar gatepiers with bases, stop-chamfered shafts, and corniced pyramidal caps. Flanking quadrant walls curve towards the road to the east, consisting of an ashlar dwarf wall with a roll-moulded cope and ornate wrought-iron railings, which are terminated at the north and south by matching ashlar piers. Additionally, there is a random rubble wall extending to the north and south along the road, with a wrought-iron pedestrian gate adjacent to the north of the principal gates, featuring square, capped sandstone ashlar piers.