Plymouth House is a Grade II listed building in the Vale of Glamorgan local planning authority area, Wales. First listed on 16 December 1952. House.

Plymouth House

WRENN ID
gaunt-screen-magpie
Grade
II
Local Planning Authority
Vale of Glamorgan
Constituency
Vale of Glamorgan MP: Kanishka Narayan (Lab)
Country
Wales
Date first listed
16 December 1952
Type
House
Address
Plymouth House, Llantwit Major, Cowbridge / Y Bont-Faen, CF61 1SJ
OS grid reference
SS 965 688
Coordinates
51.40899, -3.48908
Source
Cadw listing

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

Description

Plymouth House is a two-storey building with an attic, featuring rendered walls that likely cover local limestone rubble. It has a Welsh slate gabled roof, with old slates on the rear pitch and two pairs of tall square stone stacks with capping on the rear pitch. The front elevation, which is difficult to see due to surrounding trees, has a five-bay south elevation with modern transomed and mullioned 2-light wood casements, each with 2 over 6 panes.

The left wing of the building is disused and has blocked windows. The west end of the building has a window both above and below in the first and second bays, with the central bay featuring similar windows, including one in the attic storey that has a 19th-century fretted bargeboarded gable and part finial. The fourth bay has a similar window on the first floor above a later slate-roofed lean-to porch with a wide boarded door, leading to a 17th-century wing. The fifth bay also has windows above and below. The roof is steeply pitched with stone verges and gable stacks at either end.

The west gable end has plastered cladding over a stone wall, with early window openings above the lean-to, featuring dripstones. There is a chamfered rounded-headed window in the attic storey. The east gable has a window on each floor. The rear elevation is mostly obscured and has a damaged later rear wing.

Inside, two of the roof trusses have extended feet of the principals that are curved, and the cambered collar shows mortices and peg-holes for former arch-braces. The two through-purlins on each side have been renewed, but reused materials in the roof include a chamfered purlin with signs of intermediate pegged rafters or narrower bays than currently exist. Other trusses feature lap-jointed collars with notched ends pegged to the principals.

Local climate

Plymouth House sits in one of the wettest parts of the UK, with an average of 1,170 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 13 freeze-thaw cycles a year, fewer than 88% of listed buildings. Of these, 5 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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  • No EPC on record for this property
  • Sale history — 6 transactions since 2007
  • No related consent applications matched
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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