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

119 Greencastle Pier Road is the left one of a pair of identical semi-detached houses, erected in the late 1910s by the Commissioners of Public Works in Ireland to a standard design. It is an imposing two-storey, two-bay structure of unusual mass concrete construction, forming part of an architecturally distinctive group above the shoreline alongside adjacent keepers' houses and earlier structures dating from around 1889.

The principal facade faces south towards the sea. Walls are finished in painted smooth render with chamfered basecourse and projecting platband between ground and first floors, which continues around the left and rear elevations of the main block. Quoins mark the left corner of the facade. A rendered chimney with projecting coping rises to the left, with a similar shared chimney to the right serving both properties. The roof is flat mass concrete, finished with a deep moulded cornice at eaves level and low blocking course above.

At ground floor left, a single-storey porch with flat roof partially obscures the quoins. The porch walls are detailed as the main walls but without quoins. Its front face features a small 1/1 sliding sash window with moulded eared architrave and concrete cill; its left wall is blank and right wall has a sheeted painted timber door with identical architrave. The porch roof supports a slightly smaller, set-back concrete water tank, rising almost to the eaves of the main block. This tank is detailed with basecourse and cornice, its front face decorated with an applied roundel, flat roof with slate lid. This water tank is an unusual and visually distinctive feature of the design.

At ground floor right on the main block is a 2/2 sliding sash window. Above is an identical window with cill advancing from the platband. To the first floor left, the wall is recessed behind the water tank and has a two-paned casement window providing access to the tank and porch roof.

The left gable is detailed as the main walls with a cement-rendered chimney rising from the centre of the blocking wall. It is abutted by a modern single-storey wing, above which is a single 1/1 plastic double-glazed window to first floor left. The wing has a flat roof concealed behind a parapet with ogee hopper. Walls follow the main block detailing but without quoins. Its front wall has a 1/1 sliding sash; left cheek has two similar openings; rear wall has a modern picture window.

A two-storey return is abutted to the right of the rear wall. The remaining wall to the left has a single plastic double-glazed window to each floor. This extension is flat-roofed with blocking course and quoins, with a shallower basecourse. Its right cheek has plastic double-glazed windows matching the scale of those on the main block. Its rear wall has a large plastic picture window on each floor; its left cheek is blank. The right elevation is a party wall with the adjacent property.

The front drive is shared with the adjacent property and shares a common gateway with numbers 121 and 123. To the road is a concrete boundary wall with embattled copings, shared by all properties. Opposite number 117 is a small pedestrian gate in wrought iron, and at centre a similarly detailed carriage gate hangs on rockfaced ashlar granite piers with pyramidal granite caps. In front of number 119 stand a slate-capped cistern and a communal water pump. The pump is cast iron with curved handle, lugged nozzle, fluted top section, and removable finial lid; its internal mechanism has been disconnected. A small garden to the rear and right is enclosed by modern fencing.

The building is of industrial archaeological interest as an example of utilitarian mass concrete construction by a government agency, and derives particular historical and architectural significance from its group value with contemporary and earlier keepers' houses, forming an imposing ensemble above the shoreline. A 1975 photograph shows no windows on the left gable of the main block at first floor, indicating later alterations. Original drawings are held in the archive of the Commissioners of Irish Lights, Dublin.