Cowhouse at Isallt-fawr is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 30 March 1999. Cowhouse.
Cowhouse at Isallt-fawr
- WRENN ID
- rusted-porch-falcon
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 30 March 1999
- Type
- Cowhouse
- Address
- Cowhouse at Isallt-fawr, Dolbenmaen, Gwynedd
- OS grid reference
- SH 534 443
- Coordinates
- 52.97614, -4.18408
- Source
- Cadw listing
Description
The cowhouse at Isallt-fawr is a Grade II listed building, set longitudinally on a steeply sloping site. It is constructed from large boulders in the traditional Snowdonia style and features a slate roof with raised coped gables. The entrance is located on the downhill side, accessed by a slight ramp supported by a stone boulder wall. There is one ventilation opening and a raised door in the north gable, which likely serves an upper-level feed store.
The building consists of three bays and has two trusses; one truss has principal rafters set into the walls, along with a collar and tie beam, while the other truss has been replaced. Inside, there is a slate partition wall with orthostatic slate stall divisions against the back wall, and the edges are faced with timber to prevent injury to the livestock.
Local climate
Cowhouse at Isallt-fawr sits in one of the wettest parts of the UK, with an average of 1,550 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 20 freeze-thaw cycles a year, fewer than 79% of listed buildings. Of these, 8 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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