Barn at Byrllysg is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 13 April 2005. Barn.

Barn at Byrllysg

WRENN ID
quartered-parapet-swallow
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
13 April 2005
Type
Barn
Address
Barn at Byrllysg, Dyffryn Ardudwy, Gwynedd
OS grid reference
SH 595 240
Coordinates
52.7955, -4.08489
Source
Cadw listing

Also on this page: sale history · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The barn at Byrllysg is a small structure built from roughly coursed blockwork masonry. Its roof is currently covered with profiled metal sheeting, but it still features raised stone copings. The barn consists of three bays and has a central narrow doorway, which is flanked by narrow ventilation slits.

Local climate

Barn at Byrllysg sits in one of the wettest parts of the UK, with an average of 1,460 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 31 freeze-thaw cycles a year, fewer than 62% of listed buildings. Of these, 14 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 2022
  • 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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