20 Seaview, Warrenpoint, Newry, Co Down, BT34 3NJ

20 Seaview is the right-hand house of a pair of substantial mid-19th-century houses occupying a prominent seafront location in Warrenpoint. Built between 1840 and 1859 (first appearing on the 1859 Ordnance Survey map), the house retains much of its original character and remains little altered.

The house is two storeys with attic accommodation. It is two bays wide to the front façade and three bays wide to the rear, where the pair of houses interlock. The pitched roof is covered in natural slate, with a rendered and corbelled chimney stack on the party wall it shares with its neighbour. The right gable has a tiled verge, while a wall-head dormer to the left bay features a pitched natural slate roof and plain timber bargeboard.

The front elevation faces southeast towards the sea. The main entrance sits on the right bay, with a modern door surmounted by a plainly glazed transom and a smooth rendered and painted architrave decorated with foliated console brackets supporting a moulded cornice. Above this is a 1/1 sliding sash window with a smooth rendered and painted semicircular-headed architrave, slightly advanced block at the spring of the arch, an infilled spandrel, and a plain cill. The dormer to the left bay contains a 2/2 sash window, with two-paned windows in the left and right cheeks. A modern small skylight punctuates the right bay of the front pitch. The left bay features a two-storey canted bay that shares eaves level and rainwater goods with the main block. Its walls are rendered and painted with a common cill course to each floor, and contains 1/1 sliding sashes to the windows on each cheek. The front wall is dry-dashed with stepped stucco quoins to the right end. Boxed eaves with a plain eaves board carry moulded metal rainwater goods throughout. The right gable is blank; the left gable is abutted by the adjoining house.

The rear elevation is smooth rendered and painted. At ground floor centre is a 6/6 sliding sash window with a painted granite cill. At ground floor right is a pair of tongue-and-groove sheeted carriage doors shared with the neighbouring property. The first floor contains 6/6 sliding sashes (without horns) to the centre and right bays.

A two-storey return adjoins the main block to the rear, with a pitched natural slate roof and a glazed cat-slide roof over a rear lobby at the junction with the house. The return's walls are smooth rendered and painted. The lobby advances slightly; its left cheek is blank, and its right cheek abuts the rear wall of the main block. The lobby's yard-facing elevation contains a glazed tongue-and-groove sheeted door with a 1×3 paned window to its left (without cill), and a pair of timber casement windows to the first floor above. The return has four openings to the ground floor, the second from left being a tongue-and-groove sheeted door and the others being 6/3 sliding sashes. The first floor has two 6/6 sash windows. The left cheek of the return is blank.

A derelict two-storey outbuilding abuts the end gable of the return. It has a pitched natural slate roof, rendered walls, and numerous original openings including circular cast-iron framed lattice windows.

The front of the house is set within a garden area enclosed by a dwarf wall with hedges. The property shares a gravel drive with the adjoining building.

The Second Valuation of 1861 recorded the house as 'Bayview' with measurements of 7.75 yards by 9.5 yards by 2.5 storeys.