19 Suffolk Street, Helensburgh

1 Lower Sutherland Crescent in Helensburgh is a symmetrical, two-storey, L-plan Tudor Revival double villa built in 1859. The building features snecked red sandstone rubble with ashlar dressings. It has a base course, chamfered reveals, and ashlar mullioned windows. The bipartite windows have hoodmoulds that rise to a semi-circle over the mullion, with label stops, and the eaves are overhanging and bracketed.

On the south entrance elevation, there is a steeply gabled porch set diagonally in the re-entrant angle, featuring a shouldered-arch doorway with a fanlit panelled door and a date stone above that reads '1859'. To the right at ground level is a bipartite window, and above it is a four-centred-arch window that breaks the eaves, topped with a gabled dormerhead. To the left of the porch is an advanced gabled bay with a slightly advanced tripartite window at ground level, and an ashlar saw tooth half-pitched coping that acts as an apron to the hoodmoulded bipartite window above. There is also a loop window in the gablehead.

The east side elevation features a corniced canted window at the centre with a blocking course, and above it, there is a bipartite window on the first floor.

The north rear elevation has a modern lean-to garage attached to the left, with a stair window above on the first floor. To the right, there is a gabled dormer-headed window breaking the eaves, along with a single-storey service wing that is advanced to the outer right and abuts the wing of 1 Sutherland Crescent.

The windows are plate glass sash and case, most with two panes in the lower sashes and a single pane in the upper sashes. The roof is covered with purple slate featuring fishscale banding, and there is a corniced rendered end stack.

1 Sutherland Crescent is a mirror image of 1 Lower Sutherland Crescent.