Diamond Hill, 39 Braniel Road, Hillhall, Lisburn, County Antrim, BT27 5JJ

Diamond Hill is a four-bay single-storey vernacular house built around 1800, situated at the end of a long lane west of Braniel Road in Hillhall, Lisburn. It is accompanied by a substantial range of agricultural buildings and outhouses typical of a working farmstead.

The main house is rectangular on plan with single-storey extensions at a lower level to each side. It has a pitched natural slate roof with roughcast rendered chimneystacks, each topped with a single clay pot. The walling is rubble stone and brick, roughcast rendered and painted white. Partial cast-iron half-round rainwater goods are fitted.

The principal southeast-facing elevation is irregularly arranged with a projecting porch to the left of centre, flanked by two windows on either side (the rightmost set further back). A flat-roofed porch, a later addition, opens to the northeast with a modern timber door and a timber-casement window to the southeast. Windows are mainly 2/2 timber-framed sliding sash with vertical glazing bars and horns, set in deep reveals with projecting painted masonry sills.

The southwest gable is abutted at a lower level by an extension with a corrugated tin roof. The southeast elevation contains two leaded casement windows. The northwest elevation has two early timber-sheeted doors accessed by rubble stone steps, and a metal-framed conservatory abuts the gable. The rear (northwest) elevation is almost entirely obscured by a lean-to with three timber casement windows facing southeast and a single window to the northeast. A flat-roofed porch with a modern timber door and window is accessed by three masonry steps. A later flat-roof extension at the northeast gable now houses a garage, with a metal shutter and canopy to its gable; its elevations are blank.

To the rear stands a double-height barn built of slated rubble stone with red-brick dressings. A single-storey lean-to abuts its north gable. The south gable is reached by external steps leading to an early timber-sheeted door. The east elevation, facing the yard, contains two timber-sheeted stable doors flanked by two timber-framed windows with a smaller timber-sheeted opening above. The lean-to has a timber-sheeted door and metal-framed lattice window. The barn's west elevation is largely blank, with a single opening to the attic at centre and a series of diminutive openings at mid-height.

Northeast of the house is a stable-block with a corrugated tin roof, partially restored using concrete blocks and two replacement stable doors. Its right section contains three early stable doors and two metal-framed lattice windows. To the southeast, agricultural buildings are arranged around a yard. The earliest is a linear single-storey range with rendered walls, metal-framed windows, and early timber-sheeted doors. To the north is a large corrugated metal agricultural shed; to the west is an earlier corrugated metal shed, with a timber shed featuring a pitched felt roof abutting it to the south.

The property is set at the end of a long lane and surrounded by farmland on all sides. A small raised lawned and shrubbed garden to the front is partially enclosed by roughcast rendered walls with a cast-iron latch gate, bounded to the lane by a grass verge. To the rear are a partially ruined rubble stone slated byre, a corrugated metal outhouse, and a shed. Modern wrought-iron and metal farm gates provide access to farmland to the north, east, and west.