Cuilvona, 4 Kennedy Drive, Helensburgh

Cuilvona is an Arts and Crafts villa dated 1909, designed by Duncan McNaughtan, with additions and alterations made around 1930. It is an asymmetrical, H-plan building of two storeys, with a later three-storey block to the rear and a lower two-storey service wing to the west. The main elevations are harled with red sandstone ashlar dressings, and mock half-timbering appears on the upper storey. Many windows are mullioned in ashlar at ground level, while the first floor features timber casement windows.

The east (entrance) elevation has a doorway positioned off-centre to the right. It features a stepped and moulded ashlar surround with a keystone, a two-leaf panelled door, and a glazed vestibule door. A stepped inglenook is to the left, featuring two narrow windows and a half-piend tiled roof. A two-light window is centrally positioned, with another to the right at first floor level.

The south (garden) elevation is characterised by a semi-circular inglenook with two widely spaced windows and an ashlar coping. Flanking these are windows, with two three-light windows on the first floor. Advanced gable bays are situated on the outer right and left, each with a 1-3-1 canted window at ground level. The right bay includes a doorway from around 1930, with a jettied gablehead and a shallow canted oriel above. The left bay has a tiled half-piend roof and a shallow canted oriel to the first floor.

The west elevation includes a canted inglenook with an ashlar coping and a single-storey lean-to projection to the left. A small window is present at the first floor, and another to the outer left. The service wing adjoins at a right angle.

The north (rear) elevation is dominated by a three-storey block (circa 1930) centrally placed, comprising two windows on each storey, flanked by a slightly advanced chimney wall with a reduced wallhead stack. This block is flanked by two-storey pavilions with piended roofs, featuring two ground-floor windows to the left and a bipartite window to the right, alongside two first-floor windows.

The service wing’s south elevation displays irregular fenestration at ground level, with a bay projecting above eaves at first floor, featuring a centrally placed window and a cat-slide roof. The north elevation presents irregular ground-floor fenestration, a boarded door far to the right, and a red-tile hung upper storey with a full-length dormer. The west elevation has a jerkin-headed gable.

A variety of sash and case and casement windows are present, with differing glazing patterns. The south elevation's windows feature plate glass in the lower sashes and four-pane upper sashes on sash and case windows, while casement windows have smaller panes. The roof is tiled in red, and a tall harled stack formerly stood to the west (most stacks have since been removed).

Internally, the hall/lounge has a timber beamed ceiling, while the principal rooms boast finely detailed Edwardian chimneypieces. A timber staircase is featured, with broad balusters.

The boundary walls are harled and topped with red sandstone ashlar copings. Broad drum piers, also ashlar coped, support timber gates with balusters to the upper section.