33 Thornly Park Avenue, Paisley

33 Thornly Park Avenue is a two-storey, three-bay gabled villa designed by Thomas Graham Abercrombie in 1911. The exterior is harled with some sandstone ashlar dressings, featuring stone mullions and raked cills.

On the south elevation, there is a bay to the right of the centre with an open porch supported by timber piers, a set-back part-glazed timber door, and mock half-timbering above. The central bay has a tripartite window on the projecting ashlar ground floor beneath low swept eaves, with a flat-roofed tripartite dormer above. To the left, a broad gabled bay features tripartite windows at both the ground and first floors, with a five-light horizontal window adjacent to a jettied slate-hung gablehead. There is also a single-storey piended bay with a garage door on the outer left.

The east elevation has a full-height canted section under a polygonal roof, with three windows at ground level and an additional window in the centre at the first floor.

The north elevation is asymmetrically fenestrated, featuring three central windows and a bipartite window to the right at ground level. There is a four-part horizontal stair window with a lower left light to the left and another bipartite window in the centre at the first floor. A bay to the right breaks the eaves with a flat-roofed tripartite window. Original horizontal rooflights are present, along with a single-storey piended bay (ancillary) that clasps the outer right angle, which has a single window and a boarded timber door on the return to the left.

The west elevation displays an asymmetrical gable to the left with a first-floor window in the centre and a blank bay to the right, all above a piended roof of a single-storey ancillary section.

The villa features small-pane glazing patterns in timber sash and case windows throughout, some with plate glass lower sashes, and leaded glazing in the stair window, with the top panes coloured. The roof is covered in grey slates, and there are coped harled stacks with some cans. The eaves are overhanging with plain bargeboarding.

Inside, there is an egg and dart cornice, a timber-balustered dog-leg staircase with some panelling, and a pantry with timber cupboards and a butler's sink.

The property is enclosed by flat-coped boundary walls with square-section gatepiers and ironwork gates.