Coach House, 24 Queen Street, Helensburgh

The Coach House at 24 Queen Street in Helensburgh is an earlier 19th-century structure with later 19th-century additions, including a coach house built around 1900. It is a two-storey, four-bay villa featuring classical details. The building is rendered and lined to resemble ashlar, with ashlar dressings, while the 1900 additions are made of red brick with mock half-timbering. Notable architectural features include raised margins around the windows, hoodmoulds, quoin strips, overhanging bracketed eaves, and bargeboarded gables.

On the south elevation, the earlier villa has three symmetrical bays on the right, with a columnar doorpiece that includes an entablature, a panelled door, and a plate glass fanlight. There are windows with hoodmoulds flanking the door, and three symmetrically arranged windows on the first floor. To the outer left, there is a later single bay featuring a tripartite window at both the ground and first floor levels.

The east elevation has a window in the center at both the ground and first floors, along with a single-storey lean-to addition at the northeast angle.

On the north (rear) elevation, there is a small window located off-centre to the left, another window to the far left, and a doorway on the far right that leads to a modern conservatory. A three-light window breaks the eaves in the center, and there is a two-storey wing to the outer left. The later circa 1900 gabled porch is attached to the single-storey wing on the outer left and features four-light basket-arched windows on the north side, with a doorway on the return to the right.

The building primarily has plate glass sash and case windows, a grey slate roof, rendered coped end stacks, and moulded cans.

The interior has not been seen.

The coach house is a single-storey and attic structure with a rectangular plan. It is rendered at the ground level, featuring ashlar long and short margins around the coach entrance and the doorway to the east. The upper section is jettied and incorporates brick and half-timber detail, with grey slate-hung gables and boarded doors.

On the south elevation, there is a large doorway off-centre to the right with double doors, a doorway to the right, a window to the left, and a large doorway to the outer left that has been lowered to a flat arch.

The east elevation features a central doorway, with a grey slate-hung gable and a window in the center.

The coach house has a grey slate roof with jerkin-headed gables, red ridge tiles, and a red brick stack.

The boundary wall and gatepiers are constructed of squared, stugged grey sandstone with ashlar coping. The square-plan piers have stop-chamfered angles and pyramidal caps.