Castell Gwylan is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 23 April 1998. House.
Castell Gwylan
- WRENN ID
- plain-plinth-grove
- Grade
- II
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 23 April 1998
- Type
- House
- Address
- Castell Gwylan, Porthamel, Llanddaniel Fab
- OS grid reference
- SH 511 673
- Coordinates
- 53.1828, -4.22902
- Source
- Cadw listing
Description
Castell Gwylan is an early 19th-century house designed in a castellated Gothic style, constructed from rubble masonry that has been rendered and colourwashed. The main elevation is symmetrically planned and overlooks the Menai Strait. It is two storeys high with a five-window range arranged in a 1-3-1 pattern, where the outer bays are advanced and designed as angle towers. The house features castellated parapets with a band below. The sash windows have pointed arches and interlaced glazing bars at the top. There is a four-centred arched entrance set within a flat-roofed porch. The rear of the house has modern flat-roofed extensions. The property has been modernised and no original features of note remain.
Local climate
Castell Gwylan 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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