Cornorion Fawr is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 22 March 1993. House.
Cornorion Fawr
- WRENN ID
- rooted-rotunda-fern
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 22 March 1993
- Type
- House
- Address
- Cornorion Fawr, Cwm Nant Fyllon, Llanfyllin
- OS grid reference
- SJ 109 219
- Coordinates
- 52.78811, -3.32205
- Source
- Cadw listing
Description
Cornorion Fawr is a two-storey plus attic building constructed from Llanfyllin brick, rendered on the front and sides, and painted at the rear. It features a slate roof and brick chimneys, with modern glazing throughout. The gable end facing the road has a single camber-headed window in the attic and three camber-headed windows on each floor. To the left of the gable apex is an L-plan brick chimney.
On the right side (east), the upper floor has two camber-headed windows and a datestone inscribed with 'LL R 1729'. The ground floor includes a camber-headed window and a doorway with a modern hipped porch. The west elevation has one camber-headed window on each floor, along with a small camber-headed window between the floors on the left. There is also a modern garage with a monopitch roof. The rear gable end features a single camber-headed window in the attic and two camber-headed windows on each floor, with string courses between the floors and above the attic window. A square-headed entrance doorway is located between the ground floor windows, with a brick chimney to the right.
At the northeast corner, there is a cross wing. The rear elevation of this wing has a partially timber-framed upper floor with brick infill, and a door on the right return that projects beyond the main block, accessed by stone steps. The ground floor is constructed of rubble, featuring a square-headed doorway and window. The south elevation of the wing is rendered, with a beam between the ground and first floors and a single window on the ground floor.
The interior of the main block is said to contain a simple early 18th-century oak staircase.
Local climate
Cornorion Fawr 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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