Deganwy Castle is a Grade II* listed building in the Conwy local planning authority area, Wales. First listed on 23 September 1950. House.
Deganwy Castle
- WRENN ID
- sunken-stronghold-dew
- Grade
- II*
- Local Planning Authority
- Conwy
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 23 September 1950
- Type
- House
- OS grid reference
- SH 782 794
- Coordinates
- 53.29787, -3.82868
- Source
- Cadw listing
Description
Deganwy Castle is a fortification situated between two steep hillocks, with a bailey located between them. The former southern entrance features a short section of rubble-stone wall near the old gatehouse, and additional footings of the wall can also be seen. On the northern side, there is a bank and ditch, along with a short section of rubble-stone wall at right angles, likely part of a gateway, although the northern wall was never completed. The western hillock shows remnants of a mid-13th century curtain wall to the south and east, with a more substantial earlier section still visible at the northwestern corner. This area includes the base of a round turret and a significant retaining wall, both constructed of coursed rubble stone. No structures remain on the eastern hillock, where Mansells Tower once stood.
Local climate
Deganwy Castle sits in a wetter-than-average part of the UK, with an average of 1,100 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 76% of listed buildings.
It experiences an average of 34 freeze-thaw cycles a year, fewer than 51% of listed buildings. Of these, 18 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.
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- No EPC on record for this property
- No sale records on file
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- 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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