Gwenddar Mill is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 13 October 1966. Mill.
Gwenddar Mill
- WRENN ID
- late-tower-bittern
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 13 October 1966
- Type
- Mill
- Address
- Gwenddar Mill, Henryd, Conwy
- OS grid reference
- SH 763 744
- Coordinates
- 53.25248, -3.85536
- Source
- Cadw listing
Description
Gwenddar Mill is a mid-18th century water mill with an early 19th century cross-wing addition. Various pieces of graffiti can be seen, including "174(8)?" on the collar truss of the main range, "OH 1792" near the southeast angle, likely for Owen Holland, and "1799 HW" on the west wall.
The mill is a two-storey, L-shaped structure made of rubble, which was being re-roofed at the time of inspection in September 1995, though it was previously covered with small, undressed slates. The primary range features cambered windows on both the ground and first floors of the gable facing the road, with the upper window having a pegged oak frame and a contemporary boarded shutter, along with rubble voussoirs. There is a curved timber lintel over a large cart opening on the east return, also with voussoirs, and a blocked window opening to the left at the angle with the later cross-range. The east gable of the cross-range has another window with a loading bay above, both with frames similar to the others, and the loading bay features contemporary stable doors. A large 19th-century iron overshot waterwheel is located on the north gable of the cross-wing, with a small two-light wooden mullioned window above it, which has a cambered head. The south side has further disturbed openings.
Inside, the primary range has a two-bay layout with a pegged, curved, and chamfered collar on a partly-collapsed truss. Some 19th-century milling machinery remains, although much of it is collapsed. The later range also has a two-bay layout with a bolted collar truss. Still in place as of September 1995 is a cast-iron corn grinder made by Henry Bamford and Sons of Uttoxeter, dated 1891. The ceiling features a chamfered main beam and plain joists, also partly collapsed. A short, solid oak tread single-flight stair with a plain rail and stick balusters leads to a mezzanine loft.
Overall, Gwenddar Mill is a mid-18th century vernacular water mill that retains much of its original character.
Local climate
Gwenddar Mill sits in a wetter-than-average part of the UK, with an average of 1,150 mm of rain a year. This makes it wetter than 89% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 80% of listed buildings.
It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 23 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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