20 Pencei (Cornhill) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. A Early C19 House.
20 Pencei (Cornhill)
- WRENN ID
- former-wattle-azure
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 1 April 1974
- Type
- House
- Address
- 20 Pencei (Cornhill), Porthmadog
- OS grid reference
- SH 568 384
- Coordinates
- 52.92409, -4.13062
- Source
- Cadw listing
Description
20 Pencei, located on Cornhill, is a 3-storey house built in the 19th century, constructed in a range with No 21 and Nos 1-3 Lombard Street. It features two windows and is made of large slate-stone blocks laid in regular courses, topped with a slate roof and a stone stack on the left side. The openings are offset to the right and have raised cement-render surrounds. To the right, there is a recessed half-glazed door. The windows are replacements set in the original openings.
The rear of the building is pebble-dashed and also has replacement windows. The property has not been inspected.
Local climate
20 Pencei (Cornhill) sits in one of the wettest parts of the UK, with an average of 1,490 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 97% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 60% of listed buildings. Of these, 15 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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