Cwm Derw is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 3 September 2004. House.
Cwm Derw
- WRENN ID
- standing-porch-kestrel
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 3 September 2004
- Type
- House
- Address
- Cwm Derw, Bwlch-Y-Sarnau, Abbey Cwmhir
- OS grid reference
- SO 030 787
- Coordinates
- 52.39825, -3.42618
- Source
- Cadw listing
Description
Cwm Derw is a 2-storey house with two windows, constructed of rubble stone and topped with a slate roof. It features a stone stack on the right side, which is partially fallen, and a brick stack on the left. The lower storey openings have cambered stone heads. The doorway on the right has a boarded door, while the windows are replacement wooden casements, with a 3-light window on the right and a 2-light window on the left in the lower storey. The upper storey has 2-light windows beneath the eaves.
The left gable end retains the lintel of a former attic window and has a replaced window on the lower left under a cambered head, along with an inserted 4-pane sash window above it in a brick surround. Further to the left is the side wall of a rear outshut, which includes a boarded door under a cambered head and an iron-framed attic window above it.
On the right side of the front, there is a vertical joint that separates the house from an added stable, which has a small front window and a smaller loft opening. Above the loft opening is a stone ledge with pigeon holes. The gable end of the stable, which is partly collapsed, retains the jambs of a doorway on the left side and a loft opening. The property has not been inspected.
Local climate
Cwm Derw sits in a wetter-than-average part of the UK, with an average of 1,110 mm of rain a year. This makes it wetter than 88% 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 51 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 31 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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