Drumnakilly House, Drumnakilly Road, Drumnakilly, Omagh, Co Tyrone, BT79 0JY

Drumnakilly House is a substantial detached four-bay two-storey house built around 1840, located on the south side of Drumnakilly Road. The building displays an unusual plan form that developed in an ad hoc manner, reflecting changing circumstances over time. It represents a minor manor house that experienced reduced circumstances and was adapted accordingly.

The original rectangular main block was constructed from brick with lime render and chamfered stone quoins. Around 1900, the house underwent significant extensions: a single-storey monopitched extension was added to the east, a single-storey lean-to servants' quarters was constructed to the south-west with a further lean-to and one-and-a-half-storey addition abutting it, and a gabled single-storey porch was added to the north. A single-storey outbuilding attached to the north-east was later converted around 1970 to provide additional accommodation.

The roof structure features pitched natural slate with terracotta ridge tiles set over corbelled brick eaves and raised sandstone verges. Lime-rendered corbelled brick chimneys rise prominently. Cast iron rainwater goods are fitted throughout. Windows are square-headed timber-framed 6/6 sliding sashes with sandstone quoins. The principal elevation faces west and features four unequally spaced ground-floor windows, including one dipartite window. The first floor originally had six unequally spaced windows—from left to right showing 6/3, 6/6, 6/1, and 1/1 configurations—though some are now partially boarded. A water tower rises from the angle of one addition. The gabled porch contains a dipartite window with label mould and a square-headed six-panelled timber entrance door, also surmounted by label mould with label stops. The east elevation's first floor has six equally spaced windows, while the lean-to addition features a vertically-sheeted timber entrance door with transom light within a gabled dormer, flanked by 3/3 sliding sash windows. The south gable contains two ground-floor windows.

The setting includes a double-courtyard arrangement of outbuildings to the west. The attached outbuilding to the north-east has a monopitched natural slate roof with replacement roughcast and lime-rendered walling. To the east of the first yard stands a one-and-a-half-storey brick stable block with a monopitched corrugated metal roof, featuring segmental-headed carriage arches; its attic windows are now blocked. A further courtyard lies to the rear, enclosed to the north by recent farm buildings and to the south by a single-storey roughcast outbuilding with pitched roof. To the east, a single-storey lime-rendered stable block with a hipped natural slate roof over brick eaves contains round-arched-headed openings that are now blocked. Further recent farm buildings stand to the east, and a replacement dwelling was constructed to the west in 2008.

Historically, a building appears on the first edition Ordnance Survey map of 1833, though considerably smaller in plan and uncaptioned, which may have formed the basis for the current house. Drumnakilly House first appears by name on the second edition map of 1854. A lodge is also shown on this map, uncaptioned. The Townland Valuation of 1828–40 lists the property as belonging to Alexander McCausland and valued at £5 10s. By 1860, Griffith's Valuation assigned it a value of £22, describing it as "house, offices, gate-house and land". Captain Luke Scott occupied the property in 1873, followed by John James Gilmore in 1878. The lessors were the Representatives of Alexander McCausland in 1873, then Alexander O. S. McCausland from 1880. Daniel Levingstone became the occupier in 1891 and purchased the freehold in 1899 under late nineteenth-century land purchase legislation. By 1901, the property's valuation had been reduced to £17, with valuers' notes commenting, "This house was formerly the residence of the owner of this estate and is now a farm house. There are more offices than present occupier requires." A plan and dimensions given at that date show the house comprising seven rooms, a kitchen, pantry, scullery, and eight bedrooms, with all structures built of rubble masonry and slate. After 1933, the house was owned by Orr Kyle, with the valuation further reduced to £8 and £5 10s for outbuildings. The gate lodge, originally occupied on a service tenancy, had been demolished by 1994. According to the owner, the house was built in stages with the core dating from around 1840 and extensions added around 1900, possibly including the lean-to corridor to the east and servants' quarters to the west, though this staging is not reflected in valuation records. The attached outbuilding was converted to form part of the house around 1970. The building was scheduled for demolition at the time of recording.