Islandreagh House, 29 Islandreagh Road, Dunadry, Co Antrim, BT41 2HF

Islandreagh House is a detached three-bay two-storey rendered farmhouse built around 1820, facing south at the east end of Islandreagh Road. The building is rectangular on plan with various later additions: a modern single-storey flat-roofed extension to the west gable, a three-window-wide two-storey addition dating to around 1960 abutting the east end of the north elevation, and two modern single-storey flat-roofed quadrant linking blocks to the southeast and northwest (entrance porch) at the internal angles.

The roof is pitched with painted timber overhanging eaves and bargeboards, and features simple rendered gable chimneystacks. The walling is smooth rendered with V-jointed quoins. Windows throughout are painted timber 6/6 sashes with rendered masonry cills and square heads unless otherwise stated, with moulded architraves and no horns, retaining original cylinder glass lights.

The principal south elevation has the entrance off-centre with an elliptical-arched opening featuring a moulded painted timber surround with recessed panels to the soffit and a moulded architrave-transom supported on two Doric columns. The surround incorporates a Regency-style spiderwebbed fanlight above a painted timber door of twelve raised and fielded panels, divided by a lock-rail into two sections: square top panels and longer rectangular base panels below. Geometric-glazed sidelights on plinths flank the door. The south elevation displays two floors of three windows each with moulded architraves and original cylinder glass.

The west gable is abutted at ground floor by a flat-roofed extension. The first floor of the main west gable has one window and a round-headed 12/6 sash lights the attic. The extension west elevation features a flat-headed canted bay with a central 10/10 sash flanked by 6/6 sashes. The left end of the annex has an oculus with radial glazing. The south elevation of the annex contains a single tripartite window flanked by 2/2 sashes, while the north elevation has two square-headed 3/3 sashes.

The north elevation of the main house is abutted at its left end by the modern north addition, with a quadrant entrance porch serving the internal angle junction. The centre bay features two round-headed 9/6 sashes stacked to first floor level. Additional windows on this elevation include one further window to the main house and two 3/3 sashes to the annex. The modern entrance porch has a central modern door flanked by a six-light casement to each side.

The east gable has a single first-floor window and a round-headed 9/6 sash to the attic, abutted by a modern glazed quadrant linking block connecting to the north addition.

The house is set in extensive grounds with a gravel forecourt, manicured lawned gardens, box hedges to the front, and a modern glazed enclosed pool to the southeast. The building occupies the southeast corner of a farmcourt containing three roughcast outbuildings with multi-bay pitched roofs and replacement painted timber casements. These include a single-storey stable block to the west with skylights and two stable half-doors, a two-storey garage to the north, and a third single-storey outbuilding abutting the right end of the addition north gable. A detached modern range of outbuildings and a greenhouse lie to the northwest.

The house is set back from the road and accessed by a rendered boundary wall-lined avenue with cylindrical pillars that leads to a roundabout opening onto the farmyard. Rainwater goods are painted moulded metal gutters. The roof is of natural slate with pitched design.