Dolau 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.
Dolau Siphon Inlet House
- WRENN ID
- sombre-threshold-yew
- 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
- Dolau Siphon Inlet House, Nantmel
- OS grid reference
- SO 015 669
- Coordinates
- 52.29161, -3.44465
- Source
- Cadw listing
Description
Dolau Siphon Inlet House is a single-storey structure made of brick, featuring freestone dressings and rusticated quoins, all set on a battered rock-faced plinth. The roof is hidden behind a moulded cornice made of reconstituted stone. On the eastern side, there are central steel doors, which were once flanked by inscription bands that have now been chiselled out, along with cross windows on either side. The rear of the building has three similar windows. The western front is bordered by forecourt railings on a rock-faced stone plinth, which has diagonal sides leading to a central gate.
Local climate
Dolau 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
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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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