St-y-Nyll windmill tower and attached barn remains is a Grade II listed building in the Vale of Glamorgan local planning authority area, Wales. First listed on 2 July 1986. Windmill tower, barn.
St-y-Nyll windmill tower and attached barn remains
- WRENN ID
- third-vault-bramble
- Grade
- II
- Local Planning Authority
- Vale of Glamorgan
- Constituency
- Vale of Glamorgan MP: Kanishka Narayan (Lab)
- Country
- Wales
- Date first listed
- 2 July 1986
- Type
- Windmill tower, barn
- Address
- St-y-Nyll windmill tower and attached barn remains, St Bride'S-Super-Ely, St. Georges-Super-Ely
- OS grid reference
- ST 099 782
- Coordinates
- 51.49618, -3.29911
- Source
- Cadw listing
Description
St-y-Nyll windmill tower and the remains of an attached barn are notable structures. The windmill tower is tall, measuring 13 meters, and has a tapering, circular shape that is partly covered in ivy. It is constructed from coursed limestone blocks, with some areas rendered on the north side. The tower has four or five storeys, but the floors, cap, sails, and other machinery have all been removed. It features plain window and door openings with deep reveals, and some ironwork supports for an external gallery can be seen halfway up.
On the eastern side, there are the ruinous rubble walls of a rectangular barn that was used for threshing and winnowing. The remains of the barn include a two-storey, three-bay southern elevation, which has surviving openings with semi-circular arched heads, including a lunette. The dressed voussoirs and a square opening for drive machinery connect through the adjoining walls.
Local climate
St-y-Nyll windmill tower and attached barn remains sits in a wetter-than-average part of the UK, with an average of 1,110 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.
It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 8 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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