St Kieran's Chapel House, St John Street, Campbeltown

St Kieran's Chapel House, located on St John Street in Campbeltown, was built in 1880 and is a two-storey, three-bay presbytery with an asymmetrical design. The principal front is constructed of stugged ashlar, with the side and rear elevations made of stugged rubble. The building features a base course that is chamfered at the top, along with chamfered arrises and sloping cills at the windows.

The east (principal) elevation has three bays and is asymmetrical, with the right bay advanced and gabled. It includes a stepped hoodmould with block stops over the central entrance door, which is framed by a plaque inscribed with "St Kiaran's Chapel House 1880." The entrance features a two-leaf vertically-boarded timber door with a modern 12-pane glazed inner door, and there is a small pointed-arched window above it. The outer bays at ground floor have bipartite windows, while the first-floor window on the left breaks the eaves and is topped with a gabled stone dormerhead.

The side elevations have blank gables, and there is a modern brick garage at ground floor on the north elevation. The west (rear) elevation consists of three bays and is nearly symmetrical, with a lean-to structure at the ground floor flanked by windows on the outer left and right. There is a stair window centered below the eaves, accompanied by an adjacent slit window. The first-floor windows at the outer bays also break the eaves and feature gabled stone dormerheads.

The building has timber sash and case windows, with plate glass at the ground floor of the principal front and 4-pane windows elsewhere. There is a modern window at the first floor of the rear elevation. The roof is covered with purple slate, and the principal front has bracketed and profiled cast-iron gutters and hoppers, while the rear elevation has plain cast-iron gutters and downpipes. The lean-to has a felted mono-pitch roof with ashlar skews, and the principal gables feature ashlar skews with articulated shafts on bases, chamfered copes, and circular cans.

The boundary wall consists of a droved ashlar dwarf wall with a moulded cope and modern railings facing St John Street. Square stop-chamfered ashlar gatepiers with bases and pyramidal caps are present. There is also a random rubble wall with a concrete cope that curves at the corner of St John Street and Kirk Street, terminating to the south with a stugged ashlar pier topped with a pyramidal cap. Wrought-iron gates and hooped railings connect the pier and the garage.