Rockbrook House, 4 Temple Road, Upper Ballinderry, Lisburn, County Antrim, BT28 2PD

Rockbrook House is a symmetrical three-bay, two-storey house built around 1830, located to the east of Temple Road in Upper Ballinderry. The main block is rectangular in plan and is accompanied by a two-storey return constructed around 1840, with a single-storey modern extension of circa 2000 added to the internal angle at the rear.

The building is finished in roughcast lime render and roofed with pitched natural slate featuring ridge crestings. Rectangular smooth rendered corbelled chimneystacks rise from the walls, each topped with three octagonal decorative clay pots. Half-round cast-iron rainwater goods complete the external detailing.

The principal elevation faces south and displays three bays across its width. At ground floor, the windows are 2/2 horizontally divided timber-framed sliding-sashes contained within paired round-arched headed openings with moulded architrave terminating at a moulded stop at the centre, each with a painted projecting masonry sill. The first-floor windows are diminutive 1/1 sliding-sashes set within elliptical-arched headed openings with projecting masonry sills and plain painted reveals. A central raised panelled timber door, fitted with a brass knob, knocker and letter box, dominates the ground floor. The door features an elliptical-arched radial fanlight, raised pilasters, side panels and horizontally divided sidelights, all contained within an elliptical-arched headed opening with moulded architrave and a key block supporting a brass downlight. The entrance is accessed by a single stone step and is flanked by paired round-arched headed window openings.

The west gable is blank and faces directly onto an adjacent perpendicular outbuilding. Access between the two buildings leads to the modern extension at the north.

The rear elevation is abutted to its east by the two-storey return, which shares the same roof detailing as the principal block. The return's north gable comprises an offset external gable chimneystack. Its east elevation features two square-headed enlarged uPVC windows at ground floor and two round-arched headed windows at first floor. At the internal angle between the return and the adjacent outbuilding to the west, a modern single-storey extension with a flat roof has been added, fitted with uPVC windows, a door and uPVC rainwater goods.

Rear windows at ground floor comprise square-headed 1/1 timber-framed sliding-sashes with projecting masonry sills. The first-floor exposed sections of both the main building and return retain original windows: two square-headed 2/2 horizontally divided sliding-sash windows at ground floor on the left, with a window and timber-sheeted glazed door to the right on the return.

The house sits in a rural setting with two perpendicular aligned earlier outbuildings to the west, a barn to the south-west, and a lane connecting to Temple Road at the west. Early outbuildings have been extended and largely rebuilt to the north. A paved forecourt at the south is accessed through wrought-iron entrance gates supported on square roughcast piers with pyramidal stone caps.