Cymmer Castle is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 17 June 1966. Castle.
Cymmer Castle
- WRENN ID
- drifting-gallery-nettle
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 17 June 1966
- Type
- Castle
- Address
- Cymmer Castle, Llanelltyd, Gwynedd
- OS grid reference
- SH 731 195
- Coordinates
- 52.75855, -3.88083
- Source
- Cadw listing
Description
Cymmer Castle is a rubble-built gabled tower block that was originally one-and-a-half storeys high with a raised basement. It features a squat chimney on the north gable with weather-coursing. The north and east sides of the structure are almost at full height, while the rest of the building is in ruins. The north and south gables originally had a single large window opening on the main floor, and the east and west sides had two such windows, with the upper windows set within gabled dormers. Inside, there is a small angled fireplace in the northeast corner and what may have been a stair access in the southeast corner. Decayed oak lintels can still be seen at some openings, including two basement lights. There is also evidence of both interior and exterior render.
Local climate
Cymmer Castle sits in one of the wettest parts of the UK, with an average of 1,360 mm of rain a year. This makes it wetter than 96% 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 39 freeze-thaw cycles a year, more than 74% of listed buildings. Of these, 21 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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