21, Castle Hill

No. 21 Castle Hill is a house, now used as offices, dating from around 1800 with late 19th-century alterations. It features a sandstone ashlar facade, with coursed rubble on the other sides. The slate roof has a small flat-roofed dormer on the right, and the gables are coped with kneelers and gable chimneys. The building has a double-depth plan with a rear wing to the left and stands three storeys above a cellar, with three bays beneath an eaves cornice. The windows have raised sills, plain reveals, and 4-pane sashes on the ground and first floors, while the upper floor has 9-pane sashes. The doorway is adorned with a moulded cornice supported by fluted consoles. The recessed door, accessed by two nosed steps, features nine raised and fielded panels and an overlight with glazing bars arranged in an elliptical pattern crossed by diagonals. Inside, there is a stained glass screen in the internal porch, mahogany doors, and panelled shutters in all front rooms, along with a dogleg staircase that has an open string, two very slender turned balusters per tread, and a mahogany handrail.