Melin Gwalchmai is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 5 April 1971. Windmill.
Melin Gwalchmai
- WRENN ID
- solemn-tin-myrtle
- Grade
- II
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 5 April 1971
- Type
- Windmill
- Address
- Melin Gwalchmai, Trewalchmai
- OS grid reference
- SH 384 758
- Coordinates
- 53.25531, -4.42269
- Source
- Cadw listing
Description
Melin Gwalchmai is a three-storey windmill tower that stands full-height and has a circular plan with slightly tapering walls made of rubble masonry, which was once rendered. The ground floor features doorways with segmental heads made of rough voussoirs, while rectangular windows are present on the upper levels. The mill is now topped with a concealed flat roof. Additionally, there is a narrow tunnel that connects the eastern side of the mill to the adjoining former engine shed, which is constructed of corrugated iron.
Local climate
Melin Gwalchmai sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 84% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 92% of listed buildings.
It experiences an average of 10 freeze-thaw cycles a year, fewer than 91% of listed buildings. Of these, 3 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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
Sign in or create a free account to unlock:
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
Similar buildings
The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.
this building 1 similar nearby listed buildings