Letham Hill, 20 West Dhuhill Drive, Helensburgh

This is a two-storey, asymmetrical Arts and Crafts villa, designed by John Burnet and Son and built in 1914. It occupies an L-shaped plan, with a single-storey service wing to the northwest and a conservatory to the southwest. The exterior is largely harled, with ashlar dressings and mullions, and features extensive mock half-timbering to the first floor. This timbering corbels out from the north, east and south elevations, and is accompanied by overhanging, bracketed eaves and bargeboarded gables.

The north elevation is L-shaped, with an entrance wing projecting to the right. Two bays are recessed to the left, while a harled, corniced bay is set within the re-entrant angle, featuring a tall, stepped mullioned and transomed stair window. A window is positioned to the left at ground level, and a bipartite window is above it at the first floor.

The east elevation of the entrance wing has a tall, gabled bay with an architraved doorway positioned off-centre to the left, featuring a keystone and a deep-set, half-glazed vestibule door. Windows flank the doorway, with another above at the first floor. A tripartite dormer sits to the left of the gable. A gabled return to the right (north) has a narrow window to the centre and left, and a segmental-arched tripartite window to the right. A tripartite window is centrally located at the first floor, with another towards the outer right. A lower service wing extends to the outer right.

The east (side) elevation is gabled and features a full-height, canted window at the centre. The ground floor lights are grouped 1-2-1 with ashlar mullions, while the first-floor lights are grouped 2-3-2 and are timber mullioned. A jettied, half-timbered gabled apex tops this window.

The south (garden) elevation displays mock half-timbering to the centre and right at the first floor. A tripartite window is centrally positioned on the ground floor, with a bipartite window above it and to the right at the first floor. A canted window extends to the outer right, with lights grouped 1-2-1. A timber balcony sits above it, with a French window. A full-height, harled and coped canted window breaks the eaves to the outer left, with lights grouped 1-2-1.

The west (side) elevation has a conservatory adjoining it to the southwest. Two narrow windows are present at the first floor. A slightly advanced bay to the outer left (on the west elevation of the entrance wing) features a segmental-arched tripartite window at ground level, topped by a dormer with swept eaves. A lower, single-storey service wing adjoins at right angles to the left.

The service wing's north elevation shows a door to the outer left, a boarded window to the right, and another to the far right. The conservatory is rectangular in plan, with a low, harled base and a slightly advanced, gabled entrance bay to the south.

The windows are multi-pane casement types. The roof is covered with red tiles, and there are harled stacks and original rainwater goods.

The interior includes a hall with a coved ceiling, wainscot to the hall and first-floor landing, and a balustraded timber staircase with Jacobean applied decoration. The drawing room features an Art Nouveau chimneypiece and original wall lights.