Porth-y-carn is a Grade II* listed building in the Monmouthshire local planning authority area, Wales. First listed on 1 April 1974. Hospital administration block.

Porth-y-carn

WRENN ID
waning-arch-fern
Grade
II*
Local Planning Authority
Monmouthshire
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
1 April 1974
Type
Hospital administration block
Address
Porth-y-carn, Usk
OS grid reference
SO 375 009
Coordinates
51.70416, -2.90556
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Porth-y-carn is a villa built in a classical style. It features a stucco-rendered exterior with a shallow-pitched slate roof behind a corniced parapet and tall, long, narrow corniced rendered cross-ridge stacks. The building has a near rectangular plan, consisting of a main block with an entrance porch and a narrower, lower side wing to the left. It stands two storeys high.

The main block has a three-window range of 12-pane sashes with narrow glazing bars on the first floor, and a tripartite arrangement on the ground floor under a moulded bracketed hood, with slightly advanced side bays. There are two steps leading up to the central porch, which has a heavy entablature and Doric columns in antis, created by engraving the stucco. The porch features a very large doorcase with double 4-panelled doors, margin lights, and a large overlight with margin-type glazing, along with a stone flagged floor. To the left is the two-storey side wing, which has a two-window range.

The rear elevation facing the river is similarly designed to the front, except for the doorway, which has a shallow moulded surround with paired pilasters on either side and an entablature featuring wreathed motifs, leading to a recessed 4-panelled door. The northern elevation includes large 12-pane windows on the ground floor and smaller ones above, with a blind centre.

The villa is said to retain contemporary furnishings, including 6-panelled doors, moulded surrounds with paterae, shutters, panelled reveals, shelved recesses, moulded plaster cornices, and marble fireplaces.

Local climate

Porth-y-carn receives an average of 890 mm of rain a year. This makes it wetter than 66% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 66% of listed buildings.

It experiences an average of 41 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 18 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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