St Kieran's Chapel, St John Street, Campbeltown

St Kieran's Chapel is a Gothic church built in 1849-50. It is a rectangular building with a projecting, canted north-west end. The main front is built of polished ashlar stone, while the sides and rear are of roughcast with dressed ashlar stone detailing.

The south-east (principal) elevation has three bays and is symmetrical. A central bay is advanced at ground level, featuring a pointed-arched entrance door with moulded reveals and a hoodmould above, ornamented with carved floral stops and a cross at the apex. A pointed-arched window sits above the door, also with a hoodmould featuring carved mask stops. A gable rises above the window, topped with a carved cross. Three-tier battered buttresses flank the central bay, with filleted nook shafts to the middle tier and a panelled upper tier featuring crocketed pinnacles. Tall, pointed-arch windows are present in the outer bays, each with a hoodmould. Angle buttresses are located at the outer left and right, with a stop-chamfered upper tier and pinnacles. A moulded skew cope runs along the gable, and a carved ashlar cross marks its apex.

The south-west elevation displays three bays, each featuring tall, pointed-arch windows with stone Y-tracery and transoms, chamfered arrises and sloping cills. A corniced eaves cornice and ashlar margins at the corners are also present. The north-west elevation is a mirror image of the south-west elevation.

The north-west elevation’s canted end features a three-bay design; the outer bays incorporate windows matching the side elevations, while a single-story lean-to is situated at the centre bay.

Windows throughout the side and north-west elevations have leaded glazing with coloured glass borders. The south-east windows have timber mullions, with three circular motifs in the arch-head of the centre window and a single motif in the arch-heads of the outer windows. The entrance features a two-leaf, four-panel timber door. The roof is a grey slate, piended and bellcast over the hall, and mono-pitch over the lean-to. Cast-iron downpipes are present. An octagonal ashlar wallhead stack, corniced with a square base, is centrally positioned on the rear elevation.

The interior was modernized around 1960, including a false ceiling. A monument to James Cattenach is located in the north-west corner.

A droved ashlar dwarf wall with a moulded cope (railings have been removed) runs along St John Street, terminating to the south by a square, stop-chamfered ashlar pier with a base and ogee cap. Matching gate piers with pyramidal caps support a cast-iron gate featuring decorative finials depicting a crown, thistle, rose and shamrock.