Ballynahinch gate lodge, 64 Tannaghmore Road, Seaforde Demesne, near Seaforde, Ballynahinch, Co Down, BT24 8NU

Ballynahinch Gate Lodge is a good quality, single storey classical gate lodge built around 1830 to designs by John Lynn. It stands at the north-western (Ballynahinch) entrance to Seaforde Demesne, on the south side of Tannaghmore Road, approximately 1.5 miles north of Seaforde and 5 miles south-west of Ballynahinch, County Down.

The lodge is constructed in sandstone with a hipped, slated roof topped by a central chimney. The symmetrical front façade faces roughly east and is topped with a cornice and plain blocking course or parapet. The principal feature is a flat-roofed Ionic portico centred on the façade, with double Ionic columns supporting an entablature and cornice. Within the portico sits a panelled timber door with a semicircular spoked fanlight. To either side of the doorway is a semicircular-headed sash window with Georgian panes in a 6/6 configuration, each set within a semicircular-headed recess. Panelled pilasters define the façade edges.

The left side of the south elevation shows the south façade of the return, which includes a small sash window with Georgian panes (6/6). To the right is the south façade of the main front portion, featuring a semicircular-headed fixed window (not set within a recess). This section has edge pilasters and a relatively deeply recessed main façade section between them.

The north elevation comprises two parts. To the left is the north façade of the main front portion, which matches the front with recessed window, pilasters, and architectural detailing. To the right is the north façade of the return, which has been extended northwards to align with the main front façade. This side incorporates a partly glazed door and a sash window with Georgian panes in a 3/6 configuration.

The main front portion is built in ashlar sandstone, while the return is finished in lined render. The west façade (originally the return's rear) now forms the façade of a later lean-to extension, which has two small windows with modern frames.

An undated plan and elevation drawing by John Lynn, held at Seaforde House, shows a lodge substantially similar to the existing building but without the portico. The building retained its original footprint until the mid-twentieth century, when a lean-to extension was added to the north side of the return. A further lean-to extension was added to the west side of the return after approximately 1978 or around 1990.

A small single storey outbuilding in rubble stands to the rear. The lodge is graded B1 and remains in use as a gate lodge.