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

117 Greencastle Pier Road is the right-hand property of a pair of identical two-storey, two-bay semi-detached lighthouse keepers' houses, erected in the late 1910s by the Commissioners of Public Works in Ireland to a standard design. The building sits on the north side of Greencastle Pier Road, facing south towards the sea, and forms part of an imposing group of masonry structures above the shoreline.

The house is constructed with painted smooth render walls, featuring a chamfered basecourse and quoins to the right corner of the façade. A platband runs between ground and first floors, continuing around the right and rear elevations of the main block. A deep moulded cornice sits at eaves level with a low blocking course above. The roof is flat mass concrete. Two rendered chimneys are present: one to the right with moulded coping, and a shared chimney to the left serving both properties.

At ground floor right of the main block is a 2/2 sliding sash window with moulded eared architrave and stooled concrete cill; a matching window sits above at first floor level, with the cill advancing from the platband. To the left at ground floor, a single-storey flat-roofed porch projects from the façade, detailed as the main walls but without quoins. The porch's front wall contains a small 1/1 sliding sash window with moulded eared architrave. Its right wall holds a sheeted painted timber door with a modern electric light fitting above. The porch roof is topped with a mass concrete water tank, slightly smaller than the porch itself and rising almost to the eaves level of the main block. The tank's front face is decorated with an applied roundel and has a flat roof with a slate lid. At first floor left, the wall recesses behind the water tank and contains a two-paned casement window providing access to the tank and porch roof.

The west elevation forms a party wall with the adjacent property. The rear wall is detailed as the façade, with quoins to the left side. At ground floor centre is a single-storey gabled porch with a rendered base, glazed cheeks and timber roof featuring ogee-moulded rainwater goods and a sheeted door on the left cheek. To its left and right are 2/2 double-glazed units in original openings. To the extreme left is a small modern casement window with concrete cill, which once formed a door to an outside toilet. At first floor, either side of the rear porch are 2/2 sliding sash windows.

The right elevation is detailed as the main walls, with a chimney rising from the centre of the parapet. It is blank in fenestration. A modern single-storey garage with a shallow corrugated roof (falling to the rear), rendered walls, an up-and-over door to the front gable, two two-paned windows on the left cheek, and a sheeted door to the front has been added adjacent to this elevation.

The front drive is shared with the adjacent property. Both properties share a common gateway with Nos. 121 and 123. To the road runs an embattled mass concrete wall, shared by all these properties. Opposite No. 117 stands a small wrought iron pedestrian gate, with a similarly detailed carriage gate at centre hanging on dressed granite piers with pyramidal granite caps. A small rear yard is enclosed by painted concrete blockwork walls with a similar outhouse to the rear. The garden to rear and left is enclosed by a modern fence.

An earlier block of c.1889 stands immediately to the west, and a boathouse stands to the south-east. The house and its pair are notable for their unusual mass concrete construction and integral water tanks to the front, creating an interesting architectural contrast to the adjacent keepers' houses.