Moelwyn Mill is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 23 January 1974. Mill.
Moelwyn Mill
- WRENN ID
- crooked-tin-mist
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 23 January 1974
- Type
- Mill
- Address
- Moelwyn Mill, Tan-Y-Grisiau, Ffestiniog, Gwynedd
- OS grid reference
- SH 690 454
- Coordinates
- 52.99068, -3.95166
- Source
- Cadw listing
Description
Moelwyn Mill is an early 18th century water-driven fulling mill, with 19th century alterations, and is the only fulling mill in the Merioneth district that still has its machinery intact.
The exterior features a two-storey rubble building topped with a renewed slate roof, and it has some rock foundations. The entrance is stepped down to the left and has a modern boarded door. To the right, there are two modern 12-pane windows, with three more above them, spaced irregularly. A large overshot waterwheel with wooden spokes and an iron wheel is located to the right. At the rear, there is a catslide outshut and a modern three-pane skylight on the roof.
Adjoining to the left is a mid-19th century millhouse, constructed similarly with two floors above a raised basement. It has two bays, with the entrance on the right and recessed modern 12-pane replacement windows. The millhouse features a modern boarded door with a plain fanlight above it. Below this, there is a basement entrance and an additional window to the left. Access to the entrance is provided by modern stepped and railed steps. The openings have rendered and whitened reveals with narrow stucco frames. The building has plain end chimneys and a slate-hung side facing the mill.
The interior was not inspected during the re-survey, but it is known to retain its machinery.
Local climate
Moelwyn Mill sits in one of the wettest parts of the UK, with an average of 1,440 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.
It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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 — 3 transactions since 2004
- 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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