St Mary's Roman Catholic Church, Raploch Road, Larkhall

St Mary's Roman Catholic Church, built in 1905, is a Free-style church of rectangular plan with later alterations and additions. It has a gambrel roof with overhanging eaves and exposed rafters, and features buttresses flanking the central entrance bay. A hexagonal, separately roofed creche is located to the left, and a piended stair bay projects to the right. The exterior is harled with painted segmental and pointed-arched ashlar surrounds to the openings. A later pitched connecting corridor links the church to the presbytery at the southwest angle.

The main, north-facing elevation has a tall, architraved, pointed-arched doorway in a projecting entrance bay. The door is a replacement two-leaf boarded door with a vertically divided fanlight decorated with a trefoil motif in the center light. Smaller windows are at ground level, with taller bipartite windows above in the flanking bays. A window is positioned in every other side of the integrated hexagonal creche, and a narrow light is set high in the left return of the entrance bay. Two tall windows are evenly spaced in the aisle bay to the right.

The south-facing rear elevation has two tall, narrow windows set wide in the nave bay, a window with a smaller window flanking in the aisle bay to the left, and a blank aisle bay to the right. The east and west side elevations are regularly fenestrated with five bays, divided by tapered buttresses; each bay has a window. The west elevation also contains a narrow, trefoil-headed stair window to the outer left and the pitched connecting corridor to the outer right.

The church has timber-framed fixed windows with leaded and plain glass panes. The roof is swept grey/purple slate, with a red clay ridge and a Celtic cross finial at each gable apex. Slate covers the creche, and there is a vestigial ashlar coped stack to the rear, ashlar coped crowsteps, and replaced uPVC rainwater goods.

Inside, the church has a painted timber boarded open timber roof with scissor braces and tie beams. Point-arched arcades on octagonal columns divide the nave from the aisles. A round arched entrance, later glazed, leads to a polygonal chapel to the east. A timber staircase has timber banisters and a handrail. A triangular-headed, timber-panelled door leads to a gallery at the north end (formerly with a turned timber parapet, now blocked). A tall, pointed-arched chancel arch is located at the south end. Modern timber fittings include an altar, lectern and tabernacle stand. A triangular-headed, timber-panelled door leads to the vestry, and the church has timber pews.