Gwydir-mawr is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 20 July 1999. House.
Gwydir-mawr
- WRENN ID
- third-keep-onyx
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 20 July 1999
- Type
- House
- Address
- Gwydir-mawr, Trefor, Caernarfon, Llanaelhaearn
- OS grid reference
- SH 376 471
- Coordinates
- 52.99666, -4.42062
- Source
- Cadw listing
Description
Gwydir-mawr is a two-storey stone building with a whitewashed front and brick gable stacks, topped by a slate roof with imposed copings. The structure features three bays, with an off-centre framed and boarded door that is deeply set into the wall. On either side of the door are small 4-paned hornless sash windows. At the rear, there is a small lean-to, and the garden wall is made from setts sourced from the nearby quarry. The building was not accessible at the time of inspection.
Local climate
Gwydir-mawr sits in one of the wettest parts of the UK, with an average of 1,710 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 7 freeze-thaw cycles a year, fewer than 95% of listed buildings. Of these, 2 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 — 3 transactions since 2002
- 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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