Valve House on former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 16 February 2022. Valve house. 1 related planning application.
Valve House on former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs
- WRENN ID
- shifting-shingle-brook
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Caerfyrddin MP: Ann Davies (PC)
- Country
- Wales
- Date first listed
- 16 February 2022
- Type
- Valve house
- Address
- Valve House on former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs, Llanddeusant, Carmarthenshire
- OS grid reference
- SN 803 230
- Coordinates
- 51.8929, -3.74067
- Source
- Cadw listing
Description
The Valve House is located on a high battered base made of rock-faced stone, with the rest of the structure built from quarried stone featuring rock-faced quoins. It has a hipped slate roof with swept eaves that contribute to its distinctive appearance. The main entrance is a doorway in the east wall, which is topped by a concrete lintel. The north wall has a single-light window, while the west wall features a mullioned two-light window with concrete dressings. On the north side, there is a later outshut with a corrugated asbestos-cement roof. This outshut includes a doorway at basement level on the west side facing the dam, which is located below a two-light wood-framed window, both under concrete lintels. Additionally, there is a boarded-up doorway in the north wall, along with further stone and blockwork additions on the north and east sides of the outshut.
Local climate
Valve House on former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs sits in one of the wettest parts of the UK, with an average of 1,460 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 92% of listed buildings.
It experiences an average of 53 freeze-thaw cycles a year, more than 93% 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
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- No EPC on record for this property
- No sale records on file
- Related listed building consents — 1 application
- 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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