Dolbadarn Castle is a Grade I listed building in the Gwynedd local planning authority area, Wales. First listed on 28 May 1999. Castle.
Dolbadarn Castle
- WRENN ID
- hallowed-shingle-sienna
- Grade
- I
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 28 May 1999
- Type
- Castle
- Address
- Dolbadarn Castle, Pentre-Castell, Llanberis
- OS grid reference
- SH 586 597
- Coordinates
- 53.11653, -4.11416
- Source
- Cadw listing
Description
Dolbadarn Castle is a castle keep with a circular plan that stands about 14.5 meters high. It is constructed from regularly coursed and tightly-packed slate-stone slabs and is currently roofless. The original entrance is located on the north-western side and features a steeply pointed arch, which is accessed by a wide flight of 20th-century external steps. Above this entrance is another steeply pointed arch. To the left of the entrance, there is a well-preserved lean-to garderobe tower, and a series of narrow rectangular windows to the right indicates the position of the internal spiral staircase.
Inside, the keep is roofless, but the internal spiral staircase remains intact, along with the remnants of two large fireplaces. There are also empty sockets for the joist and beam ends of the former floor structures.
Local climate
Dolbadarn 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 95% of listed buildings.
It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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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