Carthouse at Llaithgwm is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 January 2001. Carthouse, granary.

Carthouse at Llaithgwm

WRENN ID
knotted-flagstone-curlew
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
31 January 2001
Type
Carthouse, granary
Address
Carthouse at Llaithgwm, Cwmtirmynach, Llandderfel
OS grid reference
SH 921 410
Coordinates
52.95574, -3.60723
Source
Cadw listing

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

Description

The carthouse at Llaithgwm is a rectangular, two-storey structure built from local rubble, topped with a medium-pitched slate roof. The front of the building is symmetrical and features two segmentally-arched entrances, which have rough-dressed voussoirs set back below arch-rings made of narrow stones. On the upper granary floor, there are two equally spaced, two-light windows. The left gable end includes an external stone stair that leads to an upper entrance, which has a boarded door and a pegged frame. The interior was not inspected during the survey.

Local climate

Carthouse at Llaithgwm sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 50 freeze-thaw cycles a year, more than 91% of listed buildings. Of these, 31 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
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  • 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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