Pen-yr-ogof is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 26 June 1998. Cottage.
Pen-yr-ogof
- WRENN ID
- narrow-porch-moon
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 26 June 1998
- Type
- Cottage
- Address
- Pen-yr-ogof, Rhiw, Pwllheli, Aberdaron
- OS grid reference
- SH 230 274
- Coordinates
- 52.81537, -4.62666
- Source
- Cadw listing
Description
Pen-yr-ogof is a cottage constructed from rubble stone, featuring exceptionally large boulders. It has a grouted slate roof and a square stone chimney stack on the left end, complete with dripstones and a pyramid cap. The stone gable is coped. This single-storey building includes a loft, but the front has been altered so that the door is now on the left instead of the center, with a large 6-pane sash window positioned in the center and to the right. The windows have slab lintels, and there is a small 9-pane tilting loft light in the right end wall.
Inside, a ladder stair leads to the full loft from just inside the entry. The ground floor consists of a single room, which features a large fireplace on the left with a stone slab lintel above it. There is one floor beam and joists present.
Local climate
Pen-yr-ogof sits in one of the wettest parts of the UK, with an average of 1,600 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 1 freeze-thaw cycle a year, fewer than 99% of listed buildings. Of these, 1 follows at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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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