20 Castle Street is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 16 December 1976. House.
20 Castle Street
- WRENN ID
- slow-slate-winter
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 16 December 1976
- Type
- House
- Address
- 20 Castle Street, Powys, LD3 9BU
- OS grid reference
- SO 043 287
- Coordinates
- 51.94878, -3.3925
- Source
- Cadw listing
Description
20 Castle Street is a block of four houses built in the 18th century. The buildings are three storeys high and feature a slate roof with a curved corner bay at the western end. The façade facing the street has a total of eight windows, including the corner bay. The exterior is finished with render and pebbledash that mimics masonry, and there are giant pilasters at each end, along with bands at the second floor level and the first floor sill level.
On the second floor, there are small square sash windows. The first floor has tall transomed casement windows, while the ground floor features either a single or triple sash window for each house, all without glazing bars, except for No. 18 on the west end, which has two. The eastern house, No. 21, has a corner bay and two doorways.
The western end, where Berkeley Place once stood, has been rebuilt in a Georgian style, presenting a three-window elevation with a pedimental gable, end pilasters, and banding between the floors.
Local climate
20 Castle Street sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.
It experiences an average of 56 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 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
- Sale history — 3 transactions since 2003
- 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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