Barn at Upper Dyffryn is a Grade II listed building in the Monmouthshire local planning authority area, Wales. First listed on 19 October 2000. Barn.
Barn at Upper Dyffryn
- WRENN ID
- secret-passage-alder
- Grade
- II
- Local Planning Authority
- Monmouthshire
- Constituency
- Monmouthshire MP: Catherine Fookes (Lab)
- Country
- Wales
- Date first listed
- 19 October 2000
- Type
- Barn
- Address
- Barn at Upper Dyffryn, The Dyffryn, Abergavenny, Grosmont
- OS grid reference
- SO 421 233
- Coordinates
- 51.906, -2.84162
- Source
- Cadw listing
Description
The barn at Upper Dyffryn is a large 19th-century structure featuring a lofted stable at the northwest end. It is built of rubble stone and topped with a corrugated metal roof. The southwest elevation faces the road and includes opposing doorways that lead to the threshing floor, which is located off-centre to the right. The barn doors are also made of corrugated metal. On either side of these doors, there are ventilation slits—one at ground level and one higher up.
The long wall of the barn on the left has a square doorway that leads to the pitching loft, with a boarded door secured by strap hinges. The northeast elevation faces into the farmyard and has vent slits on each side of the threshing floor, similar to those on the southwest elevation. To the right of the threshing floor, the stable features a slatted window with a segmental arched head.
The northwest gable includes a vent slit at the gable head and a ground floor stable doorway, which has a segmental arch made of stone voussoirs. This doorway is fitted with boarded half doors that have strap hinges. The southeast gable features an upper pitching loft doorway with a segmental arched head, while below, the wall has a single vent slit at both upper and ground levels.
The barn consists of five bays and is supported by collar trusses and two tiers of purlins.
Local climate
Barn at Upper Dyffryn receives an average of 840 mm of rain a year. This makes it wetter than 57% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 56% of listed buildings.
It experiences an average of 43 freeze-thaw cycles a year, more than 84% of listed buildings. Of these, 20 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
- No sale records on file
- 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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