Melin Maengwyn is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 30 January 1968. Windmill.
Melin Maengwyn
- WRENN ID
- keen-bastion-dock
- Grade
- II
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 30 January 1968
- Type
- Windmill
- Address
- Melin Maengwyn, Gaerwen, Llanfihangel Ysgeifiog
- OS grid reference
- SH 485 719
- Coordinates
- 53.22327, -4.26982
- Source
- Cadw listing
Description
Melin Maengwyn is a full height, four-storey windmill tower built with a circular plan and slightly tapering walls made of rubble masonry, which was originally rendered, with some render still remaining. The structure is currently roofless and capless. It features opposing doorways on the ground floor and rectangular windows on the upper levels, each with segmental heads made of roughly hewn voussoirs. Above the northern doorway, there is a slate tablet inscribed with a date and the initials W / H E, which stand for H E Williams, the first member of the Williams family to operate Melin Maengwyn. Additionally, there is a large hole on the northeast side of the mill tower, created for the removal of the machinery.
Local climate
Melin Maengwyn sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.
It experiences an average of 16 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 6 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
- Sale history — 1 transaction since 2025
- 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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