Cottage/outbuilding at Tan-y-groeslon is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 September 1999. Outbuilding.

Cottage/outbuilding at Tan-y-groeslon

WRENN ID
dusted-sandstone-tarn
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 September 1999
Type
Outbuilding
Address
Cottage/outbuilding at Tan-y-groeslon, Llandwrog, Caernarfon
OS grid reference
SH 456 562
Coordinates
53.08075, -4.30561
Source
Cadw listing

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

Description

This is a cottage or outbuilding located at Tan-y-groeslon, built with limewashed irregularly coursed rubblestone and featuring a graded slate roof, which has smaller slates on the main section and larger slates on the lower range. The main section includes boarded double doors immediately to the right of an integral end stack that has a small brick chimney. There is a window to the right of the doors, while the lower section on the left has a small window to the right. The interior was not accessible during the survey.

Local climate

Cottage/outbuilding at Tan-y-groeslon sits in one of the wettest parts of the UK, with an average of 1,370 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 98% of listed buildings.

It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% 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
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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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  7. Northern Range to lower farmyard, including attached cross-range to east, at Glynllifon College Farm Grade II 667 m
  8. Parallel Farm Ranges and linking arched entrance into lower farmyard at Glynllifon College Farm Grade II 677 m
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