Trewen is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 22 March 1993. Villa.
Trewen
- WRENN ID
- shadowed-pillar-sedge
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 22 March 1993
- Type
- Villa
- Address
- Trewen, Llanfyllin
- OS grid reference
- SJ 142 194
- Coordinates
- 52.76574, -3.2717
- Source
- Cadw listing
Description
Trewen is a three-storey building with three windows, featuring a rendered front over brick, moulded quoins, and square red brick chimneys. The second floor has three almost square windows; the outer windows are six-pane horned sashes, while the central window, which was a 'tax painted' dummy in old photos, now has a pair of narrow horned sashes. The first floor contains three sixteen-pane horned sashes. On the ground floor, there is a centrally placed pair of doorcases, typical of the early 19th century, with a sixteen-pane sash window on each side, although the left window is hornless. The left gable is made of rubble and has a casement window on each floor, offset to the rear. The building named 'Tegfan' has a two-storey rubble extension.
Local climate
Trewen sits in a wetter-than-average part of the UK, with an average of 960 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 61% of listed buildings.
It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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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