Eastern Slab Mill at Felin Fawr Slate Works is a Grade II* listed building in the Gwynedd local planning authority area, Wales. First listed on 11 April 1990. Industrial building.

Eastern Slab Mill at Felin Fawr Slate Works

WRENN ID
burning-baluster-ebony
Grade
II*
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
11 April 1990
Type
Industrial building
Address
Eastern Slab Mill at Felin Fawr Slate Works, Coed-Y-Parc, Bethesda, Llandygai
OS grid reference
SH 615 663
Coordinates
53.17635, -4.07367
Source
Cadw listing

Also on this page: sale history · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Eastern Slab Mill at Felin Fawr Slate Works is a Grade II* listed building with a long rectangular plan, oriented roughly north-south. It is constructed from snecked rubblestone, featuring hammer-dressed quoins and voussoirs. The gable-ended slate roof has slate coping and oversailing eaves.

On the eastern elevation, there are three original segmental-headed doorways that have been infilled later, along with an inserted full-height doorway to the left. A similar later opening is found on the west side, near the north gable end, which also has a slate-roofed full-width open lean-to supported by four cast-iron columns. The outline of a lower and narrower outbuilding can be seen at the south gable end. The eastern roof slope contains six large rooflights.

The interior was not accessible at the time of the survey.

Local climate

Eastern Slab Mill at Felin Fawr Slate Works sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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 2006
  • 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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Nearby listed buildings

  1. Water Wheel House between slab mills at Felin Fawr Slate Works Grade II* 13 m
  2. Western Slab Mill at Felin Fawr Slate Works Grade II* 25 m
  3. Foundry at Felin Fawr Slate Works Grade II 39 m
  4. Water Mill & Wheel House at Felin Fawr Slate Works Grade II 50 m
  5. Fitting and Repair Shop at Felin Fawr Slate Works Grade II 58 m
  6. Pont Coed-y-parc Grade II 93 m
  7. New Mill House Grade II 95 m
  8. Dam to SW of former Felin Fawr Slate Works Grade II 193 m
  9. Tanysgafell Grade II 487 m
  10. Tanysgafell Grade II 493 m