Hayban and cowhouse at Berth-ddu is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 27 February 2004. Agricultural building.
Hayban and cowhouse at Berth-ddu
- WRENN ID
- tired-soffit-harvest
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 27 February 2004
- Type
- Agricultural building
- Address
- Hayban and cowhouse at Berth-ddu, Nant Bryn Llefrith, Trawsfynydd, Gwynedd
- OS grid reference
- SH 710 340
- Coordinates
- 52.88872, -3.91846
- Source
- Cadw listing
Description
Hayban and cowhouse at Berth-ddu are two parallel buildings built into a slope, allowing gable pitching doors to be accessed from the higher ground level. They are connected by a high wall at the lower end. The cowhouse, located to the south, is constructed from rough rubble boulders and has a slate close-eaved roof. It features a pitching door in the upper gable, while the main doorway in the lower gable is presumed but not visible. The adjacent haybarn to the north is also built from boulders, but shows more distinct coursing. It has orthostatic stone slab pillars on the open sides and a close-eaved slate roof, with a pitching door in the upper gable end.
Local climate
Hayban and cowhouse at Berth-ddu sits in one of the wettest parts of the UK, with an average of 1,390 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 94% of listed buildings.
It experiences an average of 44 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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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