Killycolp House Farm, 21 Killycolp Road, Tullyhogue, Cookstown, Co Tyrone, BT80 8AD

Killycolp House Farm is a detached, hipped, two-storey gentleman's residence built around 1830 in a Georgian style. It stands prominently on a rise set back from the Killycolp road, approached by a long driveway with cut and carved-stone gate pillars and painted wrought-iron gates. The house sits at the top of a large sloping field overlooking the surrounding countryside, with a level parking area to the front. Its elevated position, along with its naming after the townland and adjacent road, lends it a sense of importance. A collection of associated outhouses and farm buildings to the rear enhances the overall setting.

The ground floor footprint is roughly square in plan. There is a two-storey pitched return to the rear and a single-storey lean-to to the northwest, visible on the rear elevation. Walls throughout are roughcast and painted, with rendered chimneystacks.

The front east elevation is three windows wide. At its centre sits a single-storey classical-style entrance porch — a later addition that somewhat compromises the composition — with rusticated walls and a rendered pediment. The porch has a square-headed door on its south elevation fitted with a panelled timber door, and a square-headed tripartite window to its east elevation with carved timber pilasters, margin panes, and a cut-stone sill. The ground floor windows of the main house are square-headed 1-over-1 timber sash frames with margin panes and cut-stone sills. The upper floor has 6-over-6 timber sash windows, with a classical reduction in proportion relative to the ground floor. The central first-floor window above the porch is a replacement single-light timber casement. The south side elevation has timber sliding sash windows to both ground and upper floors matching those described above. The north side elevation has no openings. The roof is hipped and covered in natural slate.

The two-storey rear return to the west has square-headed timber sliding sash frames, natural slate roofing, and one replacement uPVC window to the north. The single-storey lean-to to the northwest has a replacement uPVC window to the west; the remainder of this lean-to is partially obscured by a stone wall.

To the northwest of the house, an assortment of outbuildings forms a U-shaped yard accessed by a laneway to the north of the main house. The southern boundary of the yard is defined by a series of single-storey lean-to sheds with metal roofs and painted timber doors. A long, double-height outbuilding with a pitched metal roof forms the western boundary; its external walls are random rubble, it has four segmental-headed arched openings facing the yard, and the openings are dressed with red brick. A large painted corrugated metal shed occupies the northwest corner of the yard. The northern boundary is formed by a series of small single-storey sheds beneath a continuous pitched slate roof, with square-headed door openings and timber doors. To the northeast of the yard stands a two-storey random rubble outbuilding with an elliptical-headed opening and a square-headed door at ground level, square-headed openings with replacement windows at upper level, and two stone and brick chimneys to the roof.

The house appears on the Ordnance Survey map of 1833–34. In the first valuation of 1835 it is recorded as a newly built house not in the best condition, graded as quality letter 1A, and held by a Captain Griffith. Its recorded dimensions were 48½ft × 22½ × 22½ for the main section, with returns of 21 × 23 × 13 and 14 × 21 × 8, and thatched outbuildings of 28 × 16 × 7½ and 47 × 17½ × 7. The building was rated at £11 13s 0d. By the time of the revised Ordnance Survey map of 1857 the house was marked as 'Killycolp' and appears to have been extended slightly to the rear, with the front porch added. The 1858 valuation records the occupant as Henry A. Griffith, with Robert Graham as immediate lessor and a rateable value of £20; the valuers' dimensional notes for that survey have not survived. Henry Griffith died around 1868–69. Subsequent occupants recorded in the valuation revision books include William Crawford (1872), Deane Mann (1873), the Representatives of William Alexander Gunning (1881, with an annotation suggesting they purchased the lease for £1,410), John W. Osmond or Ormond (1882), Matthew Henderson (1885, with William H. Spier listed as immediate lessor), Sophia Henderson (1902), Sophia S. Hunter — possibly Sophia Henderson after marriage — (1910), Thomas Brown (1912), and Thomas Hamilton (1920), whose descendants retained the property until at least 1993.