Slate Mill is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 21 July 2000. Industrial facility.
Slate Mill
- WRENN ID
- shadowed-soffit-russet
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 21 July 2000
- Type
- Industrial facility
- Address
- Slate Mill, Pen-Yr-Orsedd, Caernarfon, Llanllyfni
- OS grid reference
- SH 508 537
- Coordinates
- 53.05992, -4.22683
- Source
- Cadw listing
Description
Slate Mill is a large rectangular building with a slate-slab structure, oriented roughly from north-west to south-east. It consists of parallel gable-ended sections with a central valley, although the roofs have been completely stripped of their slates. There is a doorway located approximately in the center of the south-west long wall, featuring red brick dressings, raking buttresses, and a concrete lintel. Another entrance is found in the far north-east corner.
Inside, the building has king-post roof trusses throughout, with the central roof valley supported by a mix of timber posts and slate-slab piers, with timber posts being the more common support. The line shafting for the former De Winton hydraulic feed-saw tables is still present.
Local climate
Slate Mill sits in one of the wettest parts of the UK, with an average of 1,380 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 25 freeze-thaw cycles a year, fewer than 73% of listed buildings. Of these, 12 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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