The Grange, 23 Suffolk Street, Helensburgh

The Grange, located at 23 Suffolk Street in Helensburgh, is a villa built in 1858, with later additions made by Campbell Douglas and Paterson in 1909, and a wing added to the west by A N Paterson in 1910. This two-storey, three-bay L-plan villa features a single-storey wing to the west. The exterior is constructed from squared, coursed, and stugged cream sandstone rubble, with ashlar dressings and harled additions to the rear. Notable architectural elements include a base course, quoin strips, windows with raised margins and chamfered arrises, ashlar mullions, and hoodmoulds over the ground floor windows, as well as a doorway and window above on the first floor. The building has overhanging eaves and finialed, bargeboarded gables.

On the south (entrance) elevation, there is a slightly advanced gabled bay at the center that breaks the eaves midway at the first floor. This elevation features a round-arched doorway with fanlit two-leaf panelled doors and a half-glazed vestibule door. Above, there is a round-arched window with a cill course, flanked by bipartite windows at ground level. The gabled bipartite windows above break the eaves and have basket-arched lights. The north (rear) elevation includes a two-storey wing at the center with a later addition from 1909 abutting to the east. This elevation has a tapering wallhead stack to the left, ashlar coped skews with scrolled skewputts, and a louvred vent at the center. The east elevation features a canted gabled oriel and a modern doorway in the re-entrant angle.

The wing to the west is built with similar materials and has a gambrel roof. The south elevation includes a doorway to the right with bracketed eaves that sweep down to form a canopy porch over a boarded door. To the left, there is a tall window that breaks the eaves, topped with a gable dormerhead. The north elevation has a seven-light strip window that also breaks the eaves, with a glazed roof above.

Most of the windows are plate glass sash and case. The roof is covered with grey slate, and there are coped sandstone stacks with moulded cans.

The boundary wall and gatepiers consist of low rubble walls topped with ashlar coping. The square-plan ashlar piers have chamfered angles and are capped with squared tops featuring curved panels at the base.