Nos.1&3 Castle Street

C18 style front in smooth render; parapet and cornice. Three storeys. Generally metal casement glazing with glazing bars. To east (L), block with 2 small windows on second floor; Venetian window on 1st floor; 4 round-headed shop windows on ground-floor. Main block of 5 bays; 4 square windows on second floor. On first floor, 5 windows, outer windows set in round-headed arches, centre window recessed within tall arch which rises to attic level. On ground floor, rectangular doorway in centre. To either side, 2 round-headed shop windows. To east of this, a bay with cornice and parapet at same height; 1 window on both first and second floors; 2 round-headed shop windows on ground floor.

Lobby with plate glass shop windows to each side. To rear, in circular top-lit hall, elegant 1930s style cantilevered spiral stair with solid rendered parapet; bronze handrail with "M" (for Mount Stuart) monogram.