Tri Dyffryn is a Grade II listed building in the Conwy local planning authority area, Wales. First listed on 8 October 1981. House.
Tri Dyffryn
- WRENN ID
- heavy-frieze-river
- Grade
- II
- Local Planning Authority
- Conwy
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 8 October 1981
- Type
- House
- Address
- Tri Dyffryn, Mount Pleasant
- OS grid reference
- SH 772 772
- Coordinates
- 53.27833, -3.8429
- Source
- Cadw listing
Description
Tri Dyffryn is a 1½-storey house featuring pebble-dashed walls and a slate roof. It has a large chimney stack on the right and a rear lateral stack set back from the left gable end. The original double-fronted design includes a central lean-to porch with a boarded door and false strap hinges. This porch is flanked by 2-light casement windows that have diamond leaded glazing. Gabled half dormers are present, featuring similar but shorter windows. On the right side, there is a higher 19th-century 2-storey gabled bay with 2-light windows on each storey. The left gable end has a small attic window on the left side.
While not inspected, a survey by RCAHM Wales noted a lintelled fireplace and a bread oven in the right-hand room. The ground-floor rooms are also reported to retain ceiling beams.
Local climate
Tri Dyffryn sits in a wetter-than-average part of the UK, with an average of 1,100 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 76% of listed buildings.
It experiences an average of 34 freeze-thaw cycles a year, fewer than 51% of listed buildings. Of these, 18 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
- Sale history — 1 transaction since 2020
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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