Whincroft, 2 Upper Colquhoun Street, Helensburgh

Whincroft is a 2-storey villa designed by A N Paterson in 1915, built on an asymmetrical L-plan. The building is constructed from cream bull-faced, square and snecked sandstone rubble with polished ashlar dressings and quoins, and features mock half-timbered details. It has a tall base course, moulded cill course at first floor to the south elevation, and windows that vary between single, bipartite and tripartite arrangements with chamfered reveals and stone mullions. The west-facing canted window has wooden mullions and casement windows. The eaves are bracketed.

The west elevation, which faces the street, consists of three asymmetrical bays. The lower outer left bay contains a round-arched doorpiece with a stop-chamfered shouldered surround and a modern panelled door, above which is a cartouche dated 1915. A stepped and corbelled string course extends over an apron to a bipartite window set in an advanced panel. The two taller bays to the right have an apex stack, with a small square-headed window set in a round-arched panel at ground floor, a window above, and a canted window to the left with a piended slate roof and a window above.

The south-facing garden elevation has three bays. A single transomed window sits at ground floor at the centre, with a tripartite mullioned window at first floor above. Similar windows occupy the right bays at both ground and first floor levels. A full-height canted window to the outer left contains a 1-2-1 arrangement of mullioned and transomed windows at ground and first floor levels, with a segmental-arched door and flanking windows to an attic space behind a tall parapet that forms a balcony.

The east elevation is the most complex, with ten asymmetrical bays. Two bays to the left feature a moulded string course, with a transomed window at ground floor to the outer left and a window at first floor to the right. Five advanced bays follow, featuring a window at first floor with an attic in a re-entrant angle, set within a segmental-arched ashlar panel in a corbelled panel with curved angle corbelled to square, rising to a crowstepped gable with a corniced stack at the apex. The advanced bays have a moulded lintel course at first floor and a chamfered angle to the left, with windows at ground and first floor to each bay. Three further advanced bays to the right include a taller gabled bay with a door to its left and an apex stack.

The north elevation features an advanced three-bay service wing to the outer left, with windows at the centre and left, and a tripartite window to the right. A bipartite dormer window breaks the eaves with half-timber detail to the apex and a bargeboard. A return section to the west shows a taller lop-sided gable at centre with a window at first floor and a corniced stack, beneath which are three windows at ground floor. A bracketed half-timbered tripartite window sits above the centre window. A stepped four-light stair window occupies the first floor on the return to the north, with a door at ground level to the left and a small window to the right.

An advanced block corbelled to half-timber at first floor extends from this section, featuring a tripartite window at ground level, a bipartite window to the left, and a tripartite window above to the north face. A chamfered recess on the return to the left is corbelled to square above. A taller crowstepped gabled bay at the outer right contains a circular window at ground floor and a window above, with a corniced stack at the apex.

Windows are mostly sash and case, with plate glass to the lower sashes and six-pane upper sashes. Casement windows appear on the half-timbered elevations, and the stair window contains patterned leaded glass. The roof is covered in blue and green slates with ashlar coped skews and bracketed block skewputts. The original rainwater goods remain in place.

Internally, the building is flatted and features a timber gallery at first floor to the stairhall.

The gatepiers and boundary walls are constructed from stepped bull-faced snecked rubble with semi-circular coped tops. Corniced ashlar piers are topped with ball finials.