10-12 Bon-Accord Street, Aberdeen

10-12 Bon-Accord Street in Aberdeen is a B-listed Art Deco garage and showroom designed by civil engineer and architect S Gavin Williamson, with consultant A G R Mackenzie, built between 1936 and 1937. The building occupies a corner site and incorporates the original 2-storey Georgian frontage from around 1823, designed by Archibald Simpson, along Bon Accord Square. The structure features polished granite ashlar, with grey stone on the 1823 facade and the central entrance pavilion on Bon Accord Street, while the other elevations from the 1930s are in pink stone.

The building is 2-storeys high with a flat roof and an open roof deck. It has oblong metal windows with horizontal panes and top hoppers, and Art Deco motifs in bronze. Inside, there are reinforced concrete ramps along the south wall leading to the upper floors.

On the west elevation facing Bon Accord Square, the east wall of the original house has been sympathetically reused in the new garage building. The parapet and center stack were raised by seven masonry courses during the 1936 rebuild, but the overall symmetry of the view east out of Bon Accord Square remains largely intact.

The south elevation is symmetrical, featuring a center bay that is recessed between flanking bays with continuous strip windows that are convex-curved at the inner angles. The center bay has a parapet that rises above the wallhead and a tall vertical window set back between receding planes. The southeast angle is square.

The east elevation features a central pavilion with a banded streamlined parapet above the adjoining wallheads. It has three slim vertical windows in recessed panels with bronze sheet-metal spandrel panels in the middle. The Art Deco doorpiece has receding planes and a winged bronze motif above the door. There is also a rectangular Art Deco clock and a winged torch motif with the inscription "J. 1937" above. A wrought-iron openwork beacon is raised on a granite plinth at the parapet. The flanking bays contain showrooms with large single windows at the ground level and oblong windows in a recessed band at the first floor, with two windows on each side and two on the bowed angle connecting to the south window.

The north elevation, facing Langstane Place, includes a vehicular entrance and exit at ground level. The plain west elevation, which fronts the car park, has three windows and features the center stack of the adjoining house advanced to the right.