Ardluss, 135 Sinclair Street, Helensburgh

Ardluss is an Arts and Crafts villa built in 1900, designed by William Leiper and located at 135 Sinclair Street, Helensburgh. The house is an asymmetrical L-shaped design, constructed with stugged and snecked red sandstone rubble, with ashlar dressings. The gableheads and parts of the first floor are tile-hung. A corbel course runs along the first floor, and the windows are ashlar, mullioned and transomed with chamfered arrises. Overhanging eaves and bargeboards are also present.

The east (entrance) elevation features a slightly projecting door bay with a pointed arch, hoodmould, deeply chamfered reveals, and a boarded door. Above the doorway is an overhanging tile-hung gable with a lop-sided jerkin head and a bipartite timber mullioned window. A bipartite window is set to the left at ground level. Ivy covers the tile-hung area of the first floor return, which also includes a tripartite mullioned and transomed window at ground level and a bipartite timber mullioned window at first floor. An Elizabethan-style stair window is positioned to the far right at first floor level. A single-storey and attic service wing projects to the right.

The south (garden) elevation is gabled and features a full-height, deep canted window off-centre to the left, with transoms at ground level and a tile-hung gablehead. To the right at ground level is a window, and to the far right at ground level is a bipartite mullioned and transomed window, with a four-light window above it at first floor. A bipartite window is located to the outer right at ground level with tile hanging at the first floor and a timber mullioned bipartite window above. A bipartite window is set to the left of the canted window at ground level with a relieving arch, and a bipartite window is located at first floor. A semi-octagonal canted tower is situated at the southwest angle, with three transomed windows at ground and first floor levels, topped with a polygonal, finialled roof (the finial is missing).

The west (side) elevation has a bipartite window at ground level with a relieving arch and a bipartite window at first floor, now blinded. Two lower recessed bays extend to the left, each with two windows at ground level and a single window at first floor. A single-storey and attic wing is located to the outer left.

The service wing is constructed of red sandstone rubble with a tile-hung attic. Its east elevation has a doorway in the centre, a window to the right, and a door to the outer right, with a tripartite window to the left of the doorway and a single window to the far left. The first floor has a tripartite window to the left and a dormer breaking the eaves to the right. A tripartite window is set to the gablehead on the return to the north. The west elevation features three asymmetrically disposed windows at ground level, a tripartite dormer to the right, and a jerkin head with a four-light window to the gablehead on the left.

The windows are a mix of sash and case styles. Lower sashes have plate glass, while upper sashes have multiple panes at ground level. First-floor windows are 12-pane sash and case, or multi-pane casements, with lead-pane glazing in the hall and stairhall. The roof is red tiled, with corniced red sandstone stacks.

The interior features plain cornices, a timber balustraded staircase, a dining room with an original timber chimneypiece and a timber beamed ceiling supported on stone corbels.

The property is enclosed by a semi-circular coped red sandstone boundary wall with pyramidal capped sandstone piers, having roll-moulded angles, and timber gates.