Drumnahall, 7 Spa Road, Ballymaglave south, Ballynahinch, Co Down, BT24 8LU

Drumnahall is a substantial single-storey house of circa 1840, set at the end of a lane west of Spa Road within the Montalto estate. It displays large rear returns and slight Regency overtones, and was possibly built for a senior employee or land agent of the estate. A smaller, informal dwelling dating from circa 1880–1900 abuts the property to its north side.

The main house was constructed between 1836 and 1846, first appearing in Slater's directory of 1846. The resident in that year was William McCully, though by 1856 the occupant was Reverend David Edgar, minister of Ballynahinch 2nd Presbyterian Church. Alexander Watson is recorded as resident in the second valuation of circa 1863.

The front façade faces roughly west and is symmetrical. At the centre stands a panelled door with a semicircular radial fanlight, sheltered by a flat-roofed portico supported on two Ionic columns. A laurel wreath moulding is visible on the entablature above the right column, though much of the portico roof is obscured by ivy. Either side of the doorway are large sash windows with Regency-type glazing combining both Georgian and margin panes.

The south elevation consists of the main front gable and the south façade of the long return. The gable contains a sash window with Georgian panes (6/6) at ground floor to the right, and two semicircular arched sash windows with gothic tracery (9/6) at attic level. The flush south façade of the return has a ground-floor window corresponding to that in the gable, a small sash window at ground level to the far right, and an even smaller window at first-floor level.

The north elevation of the main front section is now largely obscured by the adjoining single-storey gabled and hipped-roof house, though a portion of the north gable remains visible with an attic window (9/3) to the right, similar in style to those on the south but smaller in scale.

The rear façade contains a left-of-centre carriage doorway with timber-sheeted double doors and wicket gate. To the right, set at a higher level due to sloping ground, is a modern-framed window. Further right stands a large double door with glazed upper portions. A window with modern frame is set into a small gable above the carriage arch. The carriage arch opens into a small courtyard.

The courtyard is bounded by returns on three sides. The west side, forming the rear of the main front section, is a gabled bay with a window set at high level and, at ground level, a small timber-sheeted door leading to a cellar. The south side—actually the north face of the long return—has a large modern window and panelled door at ground level, with two small sash windows (3/3) at first floor. The north side, the south face of another return whose original exposed north façade is now hidden by the neighbouring dwelling, contains an arched cellar door at ground level (serving a separate cellar from the first) and a small sash window (3/3) at first floor, with a smaller modern-framed window to its left. A small sash window is located at the east side of the courtyard directly above the carriage arch.

The exterior is finished in lined render, left unpainted on the outer façades, while the courtyard façades are rendered and painted. The main roof is gabled and hipped, entirely slated, with three rendered chimney stacks—two serving the gables of the main front section and one serving the south return.

The neighbouring dwelling to the north is essentially rectangular, running the full length of the original house's north side, with a bay to the right of its north façade. It has a gabled and hipped slated roof and a rough-cast façade with windows of various sizes, mostly with modern frames. The arrangement of openings is irregular, though not vernacular in character.

The building undoubtedly had some original relationship to the Montalto estate and likely served as an agent's house or residence for a senior estate employee such as the head gardener. The second dwelling was probably added circa 1880–1900 as another estate worker's dwelling.