Perimeter walls of Beaumaris Gaol is a Grade I listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 23 September 1950. Prison wall.
Perimeter walls of Beaumaris Gaol
- WRENN ID
- fallen-forge-rain
- Grade
- I
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 23 September 1950
- Type
- Prison wall
- OS grid reference
- SH 603 760
- Coordinates
- 53.26338, -4.0952
- Source
- Cadw listing
Description
The perimeter walls of Beaumaris Gaol are made of coursed freestone and stand approximately 15 meters high, enclosing a space that measures 55 meters by 32 meters. The walls feature freestone coping and have a slight batter at the base. Each side includes shallow buttresses that rise to three-quarter height and are clasped at the corners.
The main entrance is located on the north side, facing Bunkers Hill, and is framed by splayed sections of the perimeter wall that connect to the main prison building. This entrance consists of four lower freestone piers with central double iron gates, flanked by bays with railings on dwarf walls.
On the south side, the wall is higher and constructed in two steps to accommodate an extension to the south wing that was made in 1867. A doorway with a concrete surround and a boarded door was later inserted in this section of the wall. On the east side, there is a wider buttress to the right of center, which features a studded door at the top; this is where the gallows was fixed. Additionally, on the inner side of the wall at this location, there is a bell topped with a wooden cross.
The inner side of the wall is pebble-dashed, except for the southwest quadrant where the original stone is exposed.
Local climate
Perimeter walls of Beaumaris Gaol sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.
It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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