Ballytrim, 132 Sinclair Street, Helensburgh

Ballytrim is a 2-storey, asymmetrical Arts and Crafts villa probably designed by Stewart and Paterson and built in 1926. The house is harled with painted ashlar dressings, featuring a base course, ashlar mullioned windows, bargeboarded gables, and swept eaves.

The north (entrance) elevation has a 3-bay central section, a canted projection to the right, and taller gabled bays to the outer left and right. A doorway off-centre left is flanked by a panelled door and an ashlar architrave with a date panel above the lintel. A small window is above the doorway on the first floor; to the right is a tall stair window with timber mullions and a double transom. A small window is located at ground and first floor to the right. A 2-storey canted projection to the right features a polygonal roof with swept eaves and a window at ground and first floor. A curved screen wall abuts the ground floor window to the right. Windows on the first floor have a continued cill course around the canted bay. A lop-sided gabled bay to the right has a window at ground and first floor, while a gabled bay to the left has a bipartite window to the right at ground level, with a garage abutting to the left. A window is positioned to the right on the first floor while an attic window is centrally located.

The east elevation includes an advanced gabled bay to the left with an apex stack, two windows at ground and first floor. To the right are two windows at ground level. A window breaking the eaves is positioned above with a half-piend dormerhead.

The south (garden) elevation presents a 3-bay central section flanked by taller gabled bays. A tripartite doorway, flanked by windows, is off-centre to the right. There are two windows above on the first floor. The gabled bay to the right features a canted window (1-2-1) at ground level with a half-piend slate roof; a tripartite window is located above on the first floor, with an attic window. A full-height canted window off-centre to the left has a polygonal slate roof. The gabled bay to the outer left has a bipartite window at ground and first floor, with an attic window above.

The west elevation features a steeply pitched roof which sweeps low above the ground floor. A bipartite window is positioned to the right at ground level, with two windows to the left. Three dormers are located above, with a half-piend to the central dormer and flat roofs to the flanking dormers. A tall harled stack is above the centre with flat-roofed dormers flanking.

A rectangular-plan garage abuts the north-east gable; its north elevation exhibits a 2-leaf garage door and a doorway to the left. The west elevation has four small windows and an additional window to the far right. A conservatory, abutting the garage to the left (east) and almost square in plan, is canted to the east and has a harled base with timber framing.

The windows feature a variety of glazing patterns, with plate glass to lower sashes, 6-pane upper sashes to the windows on the south elevation, and some 12-pane and 9-pane to the north elevation. The roof is grey/green slate with red ridge tiles, coped harled stacks, and two rooflights to the south. The interior was not inspected.

Gatepiers are square-plan with harled surfaces and a red-tiled course below tiled pyramidal caps; they are flanked by a quadrant wall with an iron railing to the right.