Wall on North side of Postern is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 4 November 2005. Wall.

Wall on North side of Postern

WRENN ID
other-granite-coral
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
4 November 2005
Type
Wall
Address
Wall on North side of Postern, Powys
OS grid reference
SO 044 288
Coordinates
51.95005, -3.39231
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The wall on the north side of the Postern is a tall structure made of stone rubble. It runs along the line of St John's Road and features quoins where it turns for about 20 metres.

Local climate

Wall on North side of Postern sits in one of the wettest parts of the UK, with an average of 1,170 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.

It experiences an average of 50 freeze-thaw cycles a year, more than 91% of listed buildings. Of these, 28 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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  • Detailed attributes — period, style, materials, features
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  • 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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  1. 5 The Postern, including Forecourt Wall and Railings Grade II 20 m
  2. 6 The Postern, including Forecourt Wall and Railings Grade II 21 m
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  4. 8 The Postern, including Forecourt Wall and Railings Grade II 27 m
  5. Postern House Grade II 29 m
  6. Garden Retaining Walls & Railings to Nos.9 & 10 The Postern Grade II 31 m
  7. Garden Wall in the Postern to Priory Hill House Grade II 33 m
  8. 11 The Postern Grade II 40 m
  9. Garden Retaining Wall to Nos.11 & 12 The Postern Grade II 40 m
  10. 12 The Postern Grade II 44 m