Sennan House, Rostrevor Road, Warrenpoint, Newry, Co Down, BT34 3RT

Sennan House is the right of a pair of mirror-image semi-detached villas dating from the mid to late 19th century. It is positioned on the north side of Rostrevor Road in Warrenpoint, facing the sea within mature grounds. The house is set back considerably from the road.

The main building is two storeys high and two bays wide, though its entrance is situated to the side elevation rather than the principal front. The pitched L-plan roof is covered in natural slate with the base of the 'L' facing east. The eaves are moulded and advanced, with bracketed ogee cast-iron gutters. The left gutter of the façade features cast-iron crestings. The chimneys are rendered stucco with chamfered bases, moulded caps and yellow octagonal terracotta pots. The front pitch is gabled to the right bay with a timber bargeboard and finial. There are four pots on the shared rendered chimney between the two houses and a two-pot chimney between the bays.

The walls are smooth rendered and painted with a moulded basecourse and moulded platband between the floors. Two further plainer and thinner platbands appear on each floor at quarter and three-quarter height up each window. All windows have run-moulded stucco architraves with plain decorative key-blocks. Ground-floor windows are 1/1 sashes unless stated otherwise. First-floor windows are 2/2 sashes with segmental heads.

The south elevation is two bays wide. The right bay advances slightly and contains a single-storey canted bay window with a moulded and fretted parapet over a blocking course concealing its flat roof. The window has an opening to the front and narrower ones to each cheek. A single first-floor window sits above with a stucco roundel in the gable featuring keyblocks to cardinal points. The left bay has a rectangular single-storey bay with two front windows and narrow blank cheeks, topped by a swept leaded roof with decorative cresting to the gutters. A single first-floor window is present.

The east elevation is three bays wide and contains the main entrance. A two-pot chimney sits on the right gable. A single-storey gabled porch abuts the central bay, detailed as the main house with a pitched natural slate roof and decorative fretted timber bargeboard on paired timber brackets. The porch front wall has a granite step up to a door with two round-headed panels separated by a beaded muntin, with a semicircular headed fanlight above and a moulded architrave with fluted arris. The left cheek has a 2/2 sash window; the right cheek is blank. The remaining bays each contain a single window opening and an identical window above the porch. All are 2/2 sashes except the ground-floor left opening, which has a low cill and part-glazed apron below the sash.

The north gable of the main house is abutted to its left by a lower two-storey return set back slightly from the east elevation. A lean-to abuts the ground floor of this section, with an artificial slate roof and painted cement rendered walls; its front wall contains a modern window. The remainder of the north elevation of the main house has a round-headed landing window at half-landing level fronting an internal yard.

The return has a pitched natural slate roof aligned north-south and a small rendered chimney on the ridge. Its east elevation is four openings wide with rendered walls and platbands at ground-floor cill level, at three-quarter height of the ground-floor windows and at first-floor level. All openings have moulded stucco architraves. Most are 6/6 sashes; exceptions include the second opening from the left at ground floor, which is a modern timber door with transom light, and the opening to its right, which is a wide window with a modern Georgian glazed timber window inset. The second opening from the left at first floor is a tiny roundel.

The return's north gable is rendered, with the central and right portions abutted by the stable block and the exposed left section blank. The return's west elevation is rendered and unpainted, abutted at the right by a small modern lean-to with a chimney stack, cement rendered walls and a shallow artificial slate roof. At the left end is a two-storey return with walls matching the main block. This has two six-paned casements on its west wall at ground floor and a 1/1 sash on its south cheek at first floor. Its north cheek abuts the stable block. The remaining elevation has a two-paned modern window at ground-floor centre, a 6/6 sash window at ground-floor left with a similar opening at first floor and a 1/1 sash at first-floor right.

The stable block is two storeys and aligned west-east with a pitched natural slate roof and cement rendered walls painted to the north and east only. Its west gable abuts the adjacent extension of St. Leonards. The east gable is blank at ground floor and has a loading door at first floor. The north elevation has a semi-elliptical headed coachway at the left, now infilled, glazed and fitted with a door. At the right are a further door and small window; the door is tongued-and-grooved sheeted and the window is a cast-iron lattice casement. The south elevation faces into the domestic yard and has a door at ground-floor left and a small 1/1 sash window at first-floor centre.

To the north and east of the stable block is a small rear yard enclosed by a rendered wall with gate piers on its south side, the gates themselves now gone.

The front garden of the house is terraced and lawned.