Haybarn at Cynlas Fawr is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 January 2001. Haybarn.
Haybarn at Cynlas Fawr
- WRENN ID
- heavy-jade-crag
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 January 2001
- Type
- Haybarn
- Address
- Haybarn at Cynlas Fawr, Cefn-Ddwysarn, Llandderfel
- OS grid reference
- SH 961 383
- Coordinates
- 52.93222, -3.54668
- Source
- Cadw listing
Description
The haybarn at Cynlas Fawr is a three-bay structure featuring a rubble end wall and square rubble front piers, topped with an old slate roof that has a medium pitch. The sides are supported by wooden posts set on rubble plinths, while the rear gable apex remains open. Inside, the original roof structure includes pegged tie-beam and raking strut trusses.
Local climate
Haybarn at Cynlas Fawr sits in a wetter-than-average part of the UK, with an average of 1,120 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 74% of listed buildings.
It experiences an average of 54 freeze-thaw cycles a year, more than 95% of listed buildings. Of these, 34 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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