123 Greencastle Pier Road, Greencastle, Kilkeel, Newry, Co Down, BT34 4LR

123 Greencastle Pier Road is the left-hand property of a symmetrical pair of two-storey, three-bay semi-detached lighthouse keepers' houses, situated on the north side of Greencastle Pier Road with its front elevation facing south to the sea.

The building has a pitched natural slate roof with clay ridges. The left gable is raised and coped with moulded kneelers. Two painted rendered two-stage chimneys rise from the party walls: the chimney between the first and second bays has two pots, while the chimney on the party wall with the adjacent property has four pots. Cast iron ogee rainwater goods with decorative hoppers are supported by a decorative eaves course comprising three courses of yellow brick, the middle one saw-toothed. Circular downpipes are held in place by poppy head clasps. The walls are painted smooth cement render with a painted chamfered basecourse. All windows have painted dressed granite cills.

The front elevation is dominated by a central porch with a pitched natural slate roof, raised gable, and rainwater goods detailed as those to the main block. The porch's front gable contains a 6/6 sliding sash window with horns, while the left cheek is blank and the right cheek has a framed and sheeted painted timber door with a modern electric light above. To the ground floor left and right bays are single 6/6 sliding sashes with horns, with three similar windows at first floor level in line with the ground floor openings. The left gable has a single narrow 4/4 sliding sash window set to the left on the ground floor. Centred above is a modern oriel window on two rendered brackets with a flat roof, large picture window, and stained sheeted apron below; each cheek is narrow but similarly detailed.

The rear elevation has a single yellow brick eaves course and is abutted to the left and centre by a single-storey lean-to above which sits a 6/6 sliding sash window to the first floor centre. The lean-to has a monopitched natural roof and half round metal rainwater goods. Its right gable is raised and concrete coped, continuing as a yard wall. The yard-facing elevation is painted and rendered with two modern top-hung timber casement windows and a modern door. The right gable is a party wall with the adjacent property.

A Silurian rubble yard wall with dressed granite quoins continues as an outbuilding to the rear. Its side (west) wall has a sheeted door with brick dressed reveal. The wall makes two steps down and has a post-war railing added to its rounded concrete coping. The outbuilding to the rear of the yard is single-storey with a mono-pitched artificial slate roof sloping to the yard, with raised coped verges and decorative kneelers. The walls are coursed random Silurian rubble with granite quoins. The external wall to the north has a brick dressed doorway (infilled with concrete blocks) with two small vent openings in the wall above. The yard does not enclose the rear right bay, which contains a driveway and a single-storey post-war garage. A paved area to the front of the house is enclosed by an embattled mass concrete wall with a wrought iron pedestrian gate and a shared vehicular gateway with a similarly detailed gate held by a pair of rock faced ashlar piers with pyramidal copings.