40 Glen Road, Brockaghboy, Garvagh, Coleraine, Co Londonderry, BT51 5DD

40 Glen Road is a single-storey thatched house built between 1820 and 1839, situated in the townland of Brockaghboy in the area historically known as Glen Ullin, approximately three miles south-west of Garvagh on the road leading to Dungiven and Coleraine. The house faces north and is set at an angle behind a forecourt south of the roadway.

The building is constructed with plastered and whitened walls beneath a thatched roof, with concrete skews flashed with lead. Each gable features a plain chimneystack; the eastern gable incorporates a clay pot, and a further plain stack serves the kitchen hearth on the ridgeline, all lead flashed. A corrugated iron-roofed outbuilding abuts the west gable.

The north-facing front elevation has a timber-sheeted half door placed slightly right of centre, flanked to the east by two 6/6 vertically sliding sash windows and to the west by three 6/6 vertically sliding sash windows with sash stops and sills of traditional depths. The three windows on the west side are more closely spaced than those opposite the doorway. The east gable contains no openings.

The rear elevation accommodates the kitchen bed outshot and features 6/6 vertically sliding sash windows either side of this projection, with a further window of slightly reduced height towards the west end. A small fixed light of 3x2 panes, retained from the earlier building to light the pantry, is positioned between the two west-facing windows. A crank handle pump is located at the west side of the house.

The original plan form with bed outshot was retained during restoration following a fire in March 1993. At that time, the bay to the east, formerly slated, was incorporated acceptably beneath the thatch. The windows were restored to match earlier types with division into small panes, and replaced internal woodwork was installed in traditional style. Re-thatching by Gerry Agnew and repairs in original style were carried out during 1981 and 1982.

A building is shown on this site on the Ordnance Survey map of 1831–32, though not noted in the contemporary valuation. The second valuation of 1856 records the occupant as O'Kane, the lessor, with a rateable value of £1.