Ardvuela, 20 Queen Street, Helensburgh

Ardvuela is a villa located at 20 Queen Street in Helensburgh, built in the later 19th century with early 20th century additions. This two-storey, three-bay building features classical details and has a later single-storey wing on the right (east side). The exterior is constructed from stugged, squared, and coursed cream sandstone with ashlar dressings, including base and string courses, moulded arrises, and ashlar mullioned windows. The eaves are paired and bracketed.

The south elevation, which serves as the entrance, has an ashlar porch at the center supported by columns on pedestals, topped with an entablature and a balustraded parapet. The porch is glazed on the south and west faces and features marble tiles. The entrance includes an architraved doorway with two-leaf panelled doors and a plate glass fanlight above. There is a bipartite window on the first floor and a tripartite window at both the ground and first floors to the right. To the outer left, there is a shallow canted full-height window with brattishing, a low conical roof, and a finial. The single-storey, two-bay wing to the outer right has a transomed window to the left and an advanced bay to the right with a four-light mullioned and transomed window, along with a transomed window on the return to the left, featuring pierced stonework on the parapet.

The east elevation includes a stone forestair leading to a doorway at the first floor. There is a two-storey and attic block adjoining at the northeast angle, with bipartite windows on the south elevation at both the ground and first floors to the left, and additional windows on the right. Two pedimented dormer windows break the eaves above, featuring round-arched windows with keystones. Modern double garages are situated to the right.

On the west elevation, there is a doorway to the outer left and a bipartite window supported on ashlar corbels breaking the eaves to the right, with another window to the left. The north (rear) elevation has a single-storey service wing with a gambrel roof and a bipartite window breaking the eaves on the west elevation.

Most of the windows are plate glass sash and case. The roof is covered with grey slate, and there are corniced ashlar stacks with moulded square-plan cans.

The interior has not been seen. The gatepiers are made of cream ashlar with rusticated piers, moulded caps, and low ball finials.