Pen-y-Groes is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 25 November 1998. House.
Pen-y-Groes
- WRENN ID
- tenth-rood-ash
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 25 November 1998
- Type
- House
- Address
- Pen-y-Groes, Pont Aberglaslyn, Porthmadog, Beddgelert, Gwynedd
- OS grid reference
- SH 596 462
- Coordinates
- 52.99472, -4.09312
- Source
- Cadw listing
Description
Pen-y-Groes is a single-storey house built from whitened rubble on boulder foundations, topped with an old slate roof made of heavy, graded small slates. The roof features a tiled ridge, crude gable parapets, and tiny loft lights. The house has squat end chimneys that include weather-coursing and capping.
The entrance is deeply recessed, with an old boarded door located to the left of the center. To the left of the entrance is a small 4-pane window from the late 19th century, set in its original opening. To the right of the entrance, there is another lower entrance with a window to the right, similar to the one on the left.
Attached to the right gable end is a lower 19th-century lean-to that has a rectangular 6-pane sash window on the front. A modern slate plaque on the building marks it as the birthplace of Richard Owen.
Local climate
Pen-y-Groes sits in one of the wettest parts of the UK, with an average of 1,500 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 98% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 58% of listed buildings. Of these, 16 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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