Glan Seiont is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 27 August 1999. House.
Glan Seiont
- WRENN ID
- half-railing-summer
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 27 August 1999
- Type
- House
- Address
- Glan Seiont, Llanrug, Caernarfon
- OS grid reference
- SH 523 639
- Coordinates
- 53.15204, -4.20954
- Source
- Cadw listing
Description
Glan Seiont is a single-storey building with an original one-room plan, oriented roughly from north-east to south-west, and extended at both gable ends. The structure is made of roughly coursed rubblestone with some galleting, topped with a graded slate roof that includes some 19th-century slate replacements. The original part of the house features infilled windows on either side of a doorway that is offset to the right, and there is a substantial ridge stack to the left, which was originally part of the gable end, at the junction with the 19th-century addition. To the right, there is an infilled doorway leading to the 18th-century addition. The rear of the building, which overlooks fields, has a 2-light window to the left of the original house part and another window that has been later converted into a blocked doorway to the left of the stack. The 18th-century addition has two small window openings.
The interior was not accessible during the survey but is reported to include an inglenook fireplace and two chamfered cross beams in the original house part, along with a further cross beam in the right room of the early 18th-century addition.
Local climate
Glan Seiont sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.
It experiences an average of 23 freeze-thaw cycles a year, fewer than 75% of listed buildings. Of these, 11 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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