Plas Gwynfryn is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1999. House.
Plas Gwynfryn
- WRENN ID
- silent-roof-ivory
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 March 1999
- Type
- House
- Address
- Plas Gwynfryn, Llanystumdwy, Criccieth
- OS grid reference
- SH 464 392
- Coordinates
- 52.92906, -4.28562
- Source
- Cadw listing
Description
Plas Gwynfryn is a building constructed in dark grey snecked rock-faced stone with paler gritstone dressings. The main south front features a romantically asymmetrical design, highlighted by a crenellated tower that rises three storeys, gables, and a three-part bay window oriel at the first floor level, which includes a date stone in the gable. To the right, there is a small crenellated stair turret. On the left side, a large porte-cochere with pinnacles is present. The windows throughout the building are generally stone mullioned and transomed. At the far east end, there is a single-storey parapetted billiard room, along with an extensive service wing at the rear. Although the slated roofs were destroyed in a fire, the external shell of the building has survived, and it features cast iron down pipes.
Inside, access is gained from the porte-cochere through an external hall that leads to a large central stair hall, which was originally illuminated by a roof lantern. The dining room suite is located at the rear, while the parlour and other reception rooms are situated at the front. Unfortunately, the entire interior, including the floors, wall panelling, stair, and plasterwork, was destroyed in the fire.
Local climate
Plas Gwynfryn sits in one of the wettest parts of the UK, with an average of 1,610 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 11 freeze-thaw cycles a year, fewer than 89% of listed buildings. Of these, 4 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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