South Lodge, Castle Grant

South Lodge at Castle Grant is a baronial-style gate lodge built in the later 19th century. It is two stories high and constructed of square tooled granite with a rubble rear and tooled granite ashlar dressings. The building has asymmetrical two-bay fronts facing south and east, which face the road and the drive respectively. A drum tower rises from a facetted base at the southeast angle, flanking the left gate pier. The entrance to the lodge is located at the angle with the tower and the east front, and it is masked by a shallow gabled and crow-stepped porch that features a monogram above the lintel.

The drum tower displays a coat of arms on the first floor and is lit by slit vents. It terminates with a slated conical roof topped by a cast-iron finial. The dwelling has a corbelled parapet and square angle bartizans. The windows feature 12-pane glazing, and the building has coped end stacks and slate roofs.

The gate piers consist of a simple pair of granite piers, although no gates survive. The right gate pier is flanked by a stumpy crenellated octagon that imitates the base of the lodge's angle tower. This is connected to a low coped and buttressed retaining wall that encloses a wide approach area from the main road, with interval piers that have pyramidal caps.