Clywedog Siphon Inlet House is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 28 February 2005. Inlet house. 2 related planning applications.
Clywedog Siphon Inlet House
- WRENN ID
- shifting-window-holly
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 28 February 2005
- Type
- Inlet house
- Address
- Clywedog Siphon Inlet House, Gwystre, Nantmel, LD1 6RW
- OS grid reference
- SO 072 660
- Coordinates
- 52.2849, -3.36136
- Source
- Cadw listing
Description
Clywedog Siphon Inlet House is a single-storey building made of brick, featuring freestone dressings and rusticated quoins, set on a rock-faced plinth. The roof is hidden behind a moulded cornice made of reconstituted stone. On the east side, there are central steel doors, which were once flanked by inscription bands that have now been chiselled out, along with cross windows. The rear of the building has three similar windows. The forecourt on the east side, which extends around the south side, is enclosed by iron railings on a rock-faced plinth and includes double gates.
Local climate
Clywedog Siphon Inlet House sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.
It experiences an average of 51 freeze-thaw cycles a year, more than 92% of listed buildings. Of these, 29 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
- Related listed building consents — 2 applications
- 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