Moelwyn Millhouse is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 23 January 1974. Millhouse.
Moelwyn Millhouse
- WRENN ID
- deep-barrel-indigo
- 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
- Millhouse
- Address
- Moelwyn Millhouse, Tan-Y-Grisiau, Ffestiniog, Gwynedd
- OS grid reference
- SH 690 454
- Coordinates
- 52.9905, -3.95165
- Source
- Cadw listing
Description
Moelwyn Mill and Millhouse is an early 18th century water-driven fulling mill that has undergone 19th century alterations. It is notable for being the only fulling mill in the Merioneth district that still has its machinery intact.
The mill itself is a two-storey building made of rubble with a renewed slate roof, and it has some rock foundations. The entrance is stepped down to the left and features 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 the mid-19th century millhouse, which is constructed in the same manner as the mill, with two floors above a raised basement. It has two bays, with the entrance to the right and recessed modern 12-pane replacement windows. The entrance features a modern boarded door and a plain fanlight. Below this, there is a basement entrance and an additional window to the left. Access to the entrance is provided by a modern stepped and railed pathway. 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 Millhouse 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
- 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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