Ardigon House, 51 Ardigon Road, Ardigon, Killyleagh, Co. Down, BT30 9TA

Ardigon House is a classical gentleman's country residence built in 1849, standing as a two-storey building with a hipped roof. It is situated at the end of a long drive to the west of Ardigon Road, approximately two miles west of Killyleagh, County Down.

The front south-east façade is symmetrical with a slightly recessed narrow central bay. At ground floor level, an entrance portico sits on a base of stone steps, comprising two Ionic columns and two square corner columns supporting an entablature with cornice and blocking course with panelled and corniced outer piers. Within the portico is the main entrance: a panelled timber door with shallow panelled pilaster jambs and three-pane sidelights with aprons. Above the door is a large elliptical fanlight with radial tracery, framed by moulded outer pilaster jambs and a moulded archivolt. The back of the portico has respondent pilasters.

The projecting outer bays each contain two sash windows at ground floor, with moulded surrounds, entablature with cornice above, and panelled cills below. The ground floor of these bays is finished in rusticated render with a projecting course above window level. The first floor of the outer bays has two windows each with plain moulded surrounds. The central bay at first floor contains a tripartite sash window with outer pilasters and a corniced entablature supported on mullions with corbel brackets. Above the entablature are two moulded panels. The first floor is finished in lined render topped with an eaves cornice and parapet with squat inner and outer piers matching the portico.

The south-west façade is finished in lined render. The ground floor has two sash windows, with Georgian panes to the right-hand window, and a window-like recess to its right. The first floor has three slightly unevenly spaced sash windows, smaller than those below. The north-east façade is also lined render, with two sash windows at ground floor and three at first floor, all with Georgian panes (six over six). At the far right of the ground floor projects a high wall, mainly in rusticated render with large outer piers and inner pilasters. At mid-point, a panelled timber dummy door is set within a shallow portico with Doric columns supporting an entablature with cornice and blocking course with small outer piers. The wall continues with a similar entablature, cornice and parapet with piers, and two larger outer piers with pyramidal tops. The wall has a chamfered base, as do the south-east, south-west and north-east façades of the house. The rear of this wall is rendered. The wall turns at a right angle and heads north-west to enclose the rear yard; its outer side is constructed in snecked greywacke stone with a brick and concrete north-west end pier.

The rear north-west façade of the house is random greywacke rubble with red brick dressings to the openings. It appears to have originally been symmetrical. At ground floor are two sash windows of slightly differing size, both with Georgian panes (six over six). The centre has a partly glazed timber door with stained glass, immediately right of which is a window (as before), with a shallow lean-to linking to a car port to the north-west and a single-storey hipped-roof outbuilding to the west. The first floor has four windows (as before) with a larger semicircular-headed staircase window to the centre with multi-pane patterned glazing.

The roof is hipped and covered in natural slate with four symmetrically positioned rendered chimney stacks featuring corbelling and tall octagonal pots. Cast iron rainwater goods are present.

To the rear is a large mainly two-storey outbuilding. Its south-east portion appears to be a dwelling with a modern partly glazed door to its south-east façade, a pair of segmental-headed windows with modern frames to the right, and a first-floor window with Georgian panes. This façade shows evidence of alteration with ill-fitting openings. The north-west portion has a rubble finish with various pedestrian, carriage and stable doors, and louvered window openings to the south-west façade. South-west of this L-shaped outbuilding is a rectangular rubble-built outbuilding, part two-storey and part single-storey with a hipped roof and openings similar to those described above.

A gravel forecourt lies in front of the house.