Barn to the rear of Llandyfan is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 7 June 1989. Church.

Barn to the rear of Llandyfan

WRENN ID
sunken-tallow-ridge
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Caerfyrddin MP: Ann Davies (PC)
Country
Wales
Date first listed
7 June 1989
Type
Church
Address
Barn to the rear of Llandyfan, Ammanford, Cyngor Bro Dyffryn Cennen, Carmarthenshire
OS grid reference
SN 642 171
Coordinates
51.83618, -3.97225
Source
Cadw listing

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

Description

The barn located to the rear of Llandyfan is constructed from rubble stone with dressed quoins and features a hipped slate roof. It has two tall cart openings with stone voussoirs and cambered heads, which originally had tall boarded double doors, with part of the right door still surviving. There are long slit vents in the center and on each side, although the right vent is obscured by the addition of the south range. The rear wall closely resembles the front.

Inside, the barn has twin stone flagged threshing floors. The roof is a five-bay structure made of oak, featuring pegged tie-beam and collar trusses, one of which is marked with the painted date of 1802. The roof also includes stepped double purlins.

Local climate

Barn to the rear of Llandyfan sits in one of the wettest parts of the UK, with an average of 1,430 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 30 freeze-thaw cycles a year, fewer than 63% of listed buildings. Of these, 13 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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  • Detailed attributes — period, style, materials, features
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  • 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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Nearby listed buildings

  1. Outbuilding on N side of farmyard at Llandyfan Grade II 12 m
  2. Outbuildings on SE side of farmyard at Llandyfan Grade II 17 m
  3. Lime Kiln to rear of Llandyfan Grade II 23 m
  4. Church of St Dyfan Grade II 38 m
  5. Llandyfan House Grade II 42 m
  6. Baptistery in Llandyfan churchyard Grade II 44 m
  7. Churchyard walls and gateway at Llandyfan church Grade II 56 m
  8. Glynhir Stable Range Grade II 2.0 km
  9. Glynhir Pigsties Grade II 2.0 km
  10. Glynhir Paddock Range Grade II 2.0 km