Glanymorfa Mawr is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 26 July 2000. House.
Glanymorfa Mawr
- WRENN ID
- sombre-flagstone-oak
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 26 July 2000
- Type
- House
- Address
- Glanymorfa Mawr, Llanegryn, Tywyn, Gwynedd
- OS grid reference
- SH 602 051
- Coordinates
- 52.62574, -4.06632
- Source
- Cadw listing
Description
Glanymorfa Mawr is a building constructed from local rubble and boulders, topped with a slate roof. It features three bays and has one storey with an attic floor. The front elevation is symmetrical but slightly offset to the left, with a central entrance that includes a part-glazed panelled door. On either side of the door are late 19th century or early 20th century four-paned horned sash windows, and there are three additional windows in the raised and gabled dormers that light the attic floor. The building has gable end stacks. At the rear, one window has been replaced with a French window that includes side lights, and there are two similar raised gabled dormers along with one small roof light. The right-hand gable end has been rebuilt.
Inside, the front door leads to a through stair hall, with the kitchen located to the right and a parlour to the left. The kitchen features a large gable end stack with a simple firebeam above, along with two cross ceiling beams.
Local climate
Glanymorfa Mawr sits in one of the wettest parts of the UK, with an average of 1,380 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 95% of listed buildings.
It experiences an average of 23 freeze-thaw cycles a year, fewer than 76% 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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