420 Antrim Road, Belfast, Co. Antrim, BT15 5GA

420 Antrim Road is a mid-terrace, two-bay, three-storey red brick and stucco Victorian house with an attic, built in 1872 to the designs of Redfern Kelly (1845–1928), a Belfast-based engineer primarily known for his work on behalf of the Belfast Harbour Commissioners — including the deepening of the Victoria Channel, the reconstruction of the Alexandra Graving Dock following its collapse in 1905, and the construction of the Thompson Graving Dock. Kelly also designed a Masonic Hall in Larne and the Murlough Cottages in Dundrum. The house forms part of a group of seven similar properties originally known as Fortwilliam Terrace (nos. 416–428 Antrim Road), all listed together and all sharing the same group value. A comparable terrace, also thought to have been designed by Kelly and formerly known as Castleton Terrace, built in 1878, stands almost directly opposite on the east side of Antrim Road.

The terrace is set slightly above road level on the west side of Antrim Road, behind a low rendered wall and a row of mature trees, with a shared bitmac driveway. Each house has a small enclosed front area and an enclosed rear yard. The house is rectangular on plan, facing east, and is now subdivided into self-contained apartments rather than used as a single dwelling.

The roof is covered in artificial slate with full-span flat-roofed dormer windows to both the front and rear — a later alteration. At the front, the dormer sits behind a stucco parapet wall with a deep moulded cornice and plain frieze. There is a replacement painted rendered chimney stack with painted pots on the north party wall, and concealed parapet guttering discharging to uPVC downpipes.

The main walling is red brick laid in Flemish bond with cement pointing, and there are continuous moulded string courses at first and second floor sill levels. The rear elevation and return are finished in rough-cast cement render.

Window openings are square-headed with decorative stucco surrounds, moulded sills, and replacement single-pane timber sash windows with ogee horns throughout, unless noted otherwise. The two-bay, three-storey east-facing front elevation features a rendered three-sided canted bay window at ground floor level, with a continuous masonry sill, plat band, and shallow cornice to the parapet. At first floor level, the windows are framed by scrolled foliate console brackets supporting a hood cornice, with a moulded sill supported on stepped brackets. At second floor level, the windows have decorative painted lugged architrave surrounds with bracketed sills.

The entrance is in the left bay, set within a gauged brick round-headed door opening with a projecting bull-nosed surround. The replacement painted timber panelled door is flanked by fluted Ionic columns supporting a dentilated lintel cornice, with a plain glazed fanlight above. The door opens onto a concrete paved platform with three concrete nosed steps down, followed by a further concrete paved platform and two more nosed steps. The front area is enclosed by a replacement red brick wall with steel railings.

To the south, the house abuts no. 418 Antrim Road; to the north, it abuts no. 422. The rear elevation has a flat-roofed three-storey cement rendered return built around 2000, with square-headed window openings fitted with precast concrete sills and uPVC casement windows, as well as uPVC French doors opening onto steel balconettes.

The surrounding area of Skegoneill was largely rural when the Antrim Road was first laid out in 1830. The second edition Ordnance Survey map of 1858 confirms that the land north of the Belfast Waterworks and Limestone Road remained predominantly rural at that time. As Belfast's population grew rapidly and the shipbuilding, rope-making, and textiles industries expanded in the mid-19th century, the townland of Skegoneill quickly developed into one of the most affluent areas in the city, with a number of gentlemen's mansions and wealthy merchants' houses established there. Nos. 416–428 Antrim Road were built on the grounds of Hopefield House, a two-storey, six-bay mansion formerly occupied by the Sinclair family, most of whose grounds were built over during the 1870s. A further group of houses at nos. 344–354 Antrim Road was also constructed on this same parcel of land in 1877.

The terrace was leased by Samuel Lawther, manager of Samuel Lawther & Co., local coal importers and ship and insurance brokers with business premises on Corporation Square, who himself resided on Duncairn Street. No. 420 was initially valued at £40 and first occupied by James Gallagher, a local grain merchant. By the time of the 1901 Census of Ireland, the house was occupied by John Burke, a local magistrate and consul to the Austro-Hungarian Empire; the census building return described his house as a first-class dwelling of 14 rooms. Burke had vacated the property by the 1930s, when Thomas Mayne, a local iron founder, took possession. Under the First General Revaluation of Property in Northern Ireland (1936–57), the house's value was raised to £48. In 1963 ownership passed to a Mr J. Bradley, who converted the building into offices, which were valued at £78 by the end of the Second General Revaluation (1956–72). The terrace was listed in 1987. The building is currently in use as a number of self-contained apartments.

Although the flat-roofed attic dormers to both front and rear and the replacement flat-roofed rear return built around 2000 represent detrimental alterations, the front elevation remains largely intact. The house retains its vertical emphasis, graduated fenestration, and restrained neo-classical stucco mouldings, exemplifying the formal aesthetic typical of substantial mid-19th-century Belfast terrace housing.