Gwellyn is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1983. House.
Gwellyn
- WRENN ID
- rough-hall-lake
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 March 1983
- Type
- House
- Address
- Gwellyn, Caernarfon
- OS grid reference
- SH 485 628
- Coordinates
- 53.14081, -4.26533
- Source
- Cadw listing
Description
Gwellyn is a Regency house dating from the early 19th century. It has two storeys with an attic and features four bays. The exterior is rendered and topped with a slate roof that has bracketed eaves and two ridge stacks. The house has an L-shaped plan due to a rear wing, which likely contained service rooms.
The front of the house is symmetrically arranged, with a shallow bow in the central bays and wider gabled outer bays. The central entrance is set within an advanced gabled porch, which is flanked by a continuous veranda that has a hipped slate roof supported by corner posts. On each floor, there are 12-pane sash windows on either side of the porch, as well as similar windows in the outer bays, which are paired on the left-hand gable. The shallow gables on the sides feature an oculus and a small round-headed window on both the left and right. The rear of the main house has sash windows on the right and blocked windows on the left.
The property has been modernised and converted into flats.
Local climate
Gwellyn sits in one of the wettest parts of the UK, with an average of 1,370 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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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