Air shaft to Llandygai Tunnel is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 24 May 2000. Infrastructure.
Air shaft to Llandygai Tunnel
- WRENN ID
- sunken-iron-pigeon
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 24 May 2000
- Type
- Infrastructure
- OS grid reference
- SH 596 706
- Coordinates
- 53.2147, -4.10283
- Source
- Cadw listing
Description
The air shaft to the Llandygai Tunnel is a structure made of coursed and dressed rubblestone blocks. It is designed in the shape of a crenellated circular turret and features "arrow slit" ventilation holes.
Local climate
Air shaft to Llandygai Tunnel 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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