Corn-barn at Trefarthen (N side of yard) is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 20 May 1998. Barn.
Corn-barn at Trefarthen (N side of yard)
- WRENN ID
- roaming-tallow-alder
- Grade
- II
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 20 May 1998
- Type
- Barn
- Address
- Corn-barn at Trefarthen (N side of yard), Llanidan
- OS grid reference
- SH 482 661
- Coordinates
- 53.17078, -4.27119
- Source
- Cadw listing
Description
The corn barn at Trefarthen is a five-bay structure dating from the 19th century. It features wide opposed doors at the center and a granary loft at one end, which is accessed by external stone steps at the rear. The walls are made of coursed rubble and include two tiers of slit vents on the lateral walls, with five vents to the left (west) of the door and two to the right (east). The gable walls also have three levels of slit vents. The barn has a pitched slate roof with slate slab copings. The central tall doors are topped with a stone voussoir basket arch, and there are blocked openings to the right (east). The granary loft on the east side has two modern windows in the lateral wall and two windows with ventilators in the gable wall. Inside, the granary features a king-post roof truss, with '1829' painted on the tie-beam.
Local climate
Corn-barn at Trefarthen (N side of yard) sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% 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 16 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 6 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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