Lleiniau-hirion is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 19 October 1971. Townhouse. 1 related planning application.
Lleiniau-hirion
- WRENN ID
- ruined-rampart-lark
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 19 October 1971
- Type
- Townhouse
- Address
- Lleiniau-hirion, Trefor, Caernarfon, Llanaelhaearn
- OS grid reference
- SH 371 462
- Coordinates
- 52.98911, -4.42693
- Source
- Cadw listing
Description
Lleiniau-hirion is a single-storey house built from granite boulders on large boulder foundations. It features a slate roof, with a rooflight, which was installed around 1994 to replace an earlier slate roof and possibly earlier thatch. The house is situated uphill and includes an integral dairy or farm building that runs in line with it. There is a framed and boarded door to the right of the main axial stack, leading into a living kitchen that may have originally served as a dairy. The timber windows were replaced around 1994, and there is a small rear bedroom wing. The dairy or farm building is narrower and located beyond and to the right of the former gable stack, which now has the main entrance door. This entrance features a central door flanked by small windows on each side. A large buttress supports the gable end. The interior was not seen during the inspection but is said to have a tile fireplace covering the presumed large main fireplace.
Local climate
Lleiniau-hirion 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
- No sale records on file
- Related listed building consents — 1 application
- 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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