Alltwineu is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 19 January 2001. House.
Alltwineu
- WRENN ID
- eternal-floor-rush
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 19 January 2001
- Type
- House
- Address
- Alltwineu, Llanwrtyd, Builth Wells, Llanwrtyd Wells
- OS grid reference
- SN 858 489
- Coordinates
- 52.12745, -3.6684
- Source
- Cadw listing
Description
Alltwineu is a two-storey, three-window house built from whitened rubble stone and topped with a slate roof featuring stone end stacks. The house has projecting boarded eaves and large quoins. All openings are topped with shallow segmental heads made of stone voussoirs. The entrance is slightly offset to the left of center and includes a half-glazed planked door with a multi-pane overlight above it. The windows are hornless 8-over-8-pane sashes with stone sills. On the north gable end, there is a late 20th-century casement window, which is offset to the left on the lower storey. The south gable end has a late 20th-century half-glazed door, which is offset to the right. The rear of the house features three windows on the upper storey, similar to those on the front, and a similar window to the left on the lower storey. To the right, there is a late 20th-century casement window that is not aligned with the windows above.
Access to the interior was not available at the time of inspection, but the exterior suggests there is a central staircase hall, with the largest reception room located to the right.
Local climate
Alltwineu sits in one of the wettest parts of the UK, with an average of 1,240 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.
It experiences an average of 46 freeze-thaw cycles a year, more than 87% of listed buildings. Of these, 26 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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