Hafod-y-llyn is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 21 July 2000. House, cowhouse.
Hafod-y-llyn
- WRENN ID
- tangled-cupola-harvest
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 21 July 2000
- Type
- House, cowhouse
- Address
- Hafod-y-llyn, Cors Y Llyn, Caernarfon, Llanllyfni, Gwynedd
- OS grid reference
- SH 493 502
- Coordinates
- 53.0286, -4.24826
- Source
- Cadw listing
Description
Hafod-y-llyn is a single-storey building with a two-room layout and a cowhouse attached to the left gable end. The structure is made of irregularly coursed rubblestone, with some traces of plaster still visible. It features a slate roof with coped verges on the house section. There is an integral end stack on the right and another stack to the left of the centre at the junction with the cowhouse, both equipped with slate drips. The house part has a central half-glazed door flanked by windows; the left window is a Victorian sash, while the right window is missing its joinery. A small window in the right gable end provides light to the croglofft. The door to the cowhouse is missing. The interior was not accessible during the survey but is reported to have a two-unit plan with some evidence of a former croglofft above the service end.
Local climate
Hafod-y-llyn sits in one of the wettest parts of the UK, with an average of 1,550 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 79% of listed buildings. Of these, 8 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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