Torpantau tunnel - E portal is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Tunnel portal.
Torpantau tunnel - E portal
- WRENN ID
- forbidden-pedestal-sienna
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 17 December 1998
- Type
- Tunnel portal
- Address
- Torpantau tunnel - E portal, Taf Fechan, Talybont-On-Usk, Powys
- OS grid reference
- SO 056 171
- Coordinates
- 51.84479, -3.37127
- Source
- Cadw listing
Description
The Torpantau tunnel features a semi-circular arched portal made of coursed rock-faced stone. The portal is distinguished by prominent rock-faced voussoirs with diamond-shaped ends and dressed tooled edges, resembling quoins. It includes a rock-faced string, angled end piers, and large rock-faced coping blocks. Inside the tunnel portal, the sides consist of giant rock-faced stone blocks up to the impost level, with tooled stone above. The interior has coursed rubble vaults, with some brick further inside the tunnel, which is then cut directly into rock.
Local climate
Torpantau tunnel - E portal sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.
It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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
Sign in or create a free account to unlock:
- 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.
Similar buildings
The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.
this building 1 similar nearby listed buildings