Barn at Grawen Farm is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 22 August 1975. Barn.

Barn at Grawen Farm

WRENN ID
winding-lancet-falcon
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
22 August 1975
Type
Barn
Address
Barn at Grawen Farm, Cwmtaf, Merthyr Tydfil, Vaynor
OS grid reference
SO 015 111
Coordinates
51.79037, -3.4287
Source
Cadw listing

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

Description

The barn at Grawen Farm is a 19th-century structure built from rubble stone and topped with a metal sheet roof. It features a tall opening with cut stone voussoirs forming a cambered arch. There is one small loop window on each side of the barn. The left end wall has a battered base and six vent loops, while the rear has a similar door to the front.

Inside, there are two beams beneath the roof trusses, positioned one on each side of the entry. The roof trusses are primarily made of pine and include added collars for support.

Local climate

Barn at Grawen Farm sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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 — 1 transaction since 2019
  • 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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