Seapark House, 109 Shore Road, Greenisland, Carrickfergus, Co Antrim, BT38 8TZ

Seapark House is a detached four-bay two-storey house with classical detailing, built around 1804 and extended around 1855. It stands in a private estate on the east side of Shore Road, Greenisland.

The building is rectangular on plan with two-storey projections on its main elevations. A square-on-plan four-stage tower rises to the west, abutted on its south elevation by a single-storey return which serves as a garage. The roofs are hipped with natural slate and lead-sheeted ridges. Five rendered corbelled chimneys with original clay pots punctuate the roofline.

The walls are smooth rendered over a projecting stepped plinth. Windows throughout are timber-framed 6/6 sliding-sash with moulded architraves unless stated otherwise. The ground floor features a flat dentilled entablature. Sills are painted masonry.

The south-facing entrance elevation spans four bays. The first bay to the west is bowed with a conical roof and contains three windows at each floor above a double-leaf glazed entrance door at ground floor right. Bay three holds three windows at first floor and a double-leaf entrance door at left at ground floor, with two eighteen-pane fixed windows to the right. This bay is abutted by a single-storey loggia supported on Tuscan columns. Bay four is canted with a hipped roof and contains an entrance door with transom light on the south elevation, flanked by windows to each cheek and three windows at first floor. The door is abutted by a single-storey porch supported on paired Ionic columns. Bay five is bowed and features a tripartite window at each floor; the ground floor has a 1/1 sliding-sash and the first floor a 2/1 sliding-sash, both divided by timber mullions with console brackets.

The west elevation is abutted off-centre to the right by the four-stage tower. To the right of the tower is a single-storey lean-to slated extension linking the main house and garage return. To the left, a single-storey extension with hipped slated roof is topped by deep overhanging eaves supported on Ionic columns. The exposed section to the right of the tower is blank. The exposed section to the left contains horizontally sheeted timber and a single 6/6 window at first floor.

The garden elevation (north-facing) is four bays wide. At the left, a bowed bay contains a tripartite window at each floor: a 9/9 sliding-sash at ground floor and a 6/3 at first floor, each divided by timber mullion with console bracket. Bay two is canted and features a double-leaf entrance door with transom light (both with six glazed panes over single fixed panels), accessed by three masonry steps and surmounted by a 6/3 window at first floor. Windows to each cheek flank this bay. Bay three contains two dipartite windows at ground floor (divided by timber mullion with console bracket), each surmounted by a window at first floor, with a further small window at each floor to centre. Bay four is bowed and contains two windows at each floor. Bay five is canted with three windows at each floor.

The east elevation consists of three bays. The central bay is canted and contains three windows at each floor: a 6/6 sliding-sash at ground floor and a 9/9 at first floor. The outer bays each contain two windows at each floor. The south elevation mirrors these proportions and contains a single 4/4 sliding-sash to the left and a dipartite 4/4 sliding-sash to the right.

The four-stage tower's first double-height stage is abutted to north and south by single-storey extensions. The west elevation of this stage contains two windows at ground and first floor. The second stage contains a single window at east and west elevations, and two windows to north and south. The third stage contains three openings at each elevation, with the central window being a 1/1 sliding-sash and the outer openings blind, surmounted by a stucco frieze and cornice. The fourth stage contains three segmental-arched-headed windows surmounted by hood-mouldings at each elevation, above a cornice and balustrade.

The tower is connected to the main house by a two-storey linking block with pitched slated roof and a timber casement to the north. The single-storey return (garage) is detailed as the main block. Its east elevation features a central double-leaf entrance door flanked by three timber-framed segmental-headed 2/2 sliding-sash windows, each divided by Ionic columns supporting a plain dentilled entablature, with a further window at right contained within the linking block. The south elevation contains four blind segmental-headed openings each divided by Ionic columns supporting a plain dentilled entablature. The north elevation contains three replacement panelled garage doors to the right and a blind segmental-headed opening to the left, each divided by pilasters supporting a dentilled entablature. The east elevation of the linking block between the main house and single-storey return contains a central double-leaf timber glazed door flanked by tripartite 4/4 sliding-sashes, each divided by Ionic columns supporting a moulded eaves course.

The house is set within mature private estate grounds. To the south-west, the estate boundary is formed by roughly coursed walling accessed through a pair of original cast-iron gates supported on square pillars with rubble crenellations. To the north, the boundary wall consists of a smooth rendered plinth wall surmounted by cast-iron railing, with a pair of recent cast-iron gates supported on square pillars with banded rustication and concrete capping. Belfast Lough lies to the east. A bathing house and boathouse stand to the south-east of the main building.

The roof is natural slate. The walls are smooth rendered. Windows have been largely replaced with double-glazed 9/9 timber sliding-sashes at ground floor and 6/3 at first floor with painted masonry sills unless stated otherwise. Few original cast-iron rainwater goods remain; most have been replaced with cast-metal.