Tan-y-groeslon is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 September 1999. House.
Tan-y-groeslon
- WRENN ID
- worn-mullion-gilt
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 30 September 1999
- Type
- House
- Address
- Tan-y-groeslon, Llandwrog, Caernarfon
- OS grid reference
- SH 456 562
- Coordinates
- 53.08088, -4.30553
- Source
- Cadw listing
Description
Tan-y-groeslon is a building constructed from irregularly coursed rubblestone, featuring slate lintels and significant areas of rendering on the left gable end. It has a slate roof with slate-coped verges at the gable ends of the main range. The main entrance is a narrow central porch that leads to a boarded inner door, positioned between slightly projecting full-height gables. The first floor has small 3-light mullioned and transomed timber windows, while the ground floor features larger multi-paned windows, with the lower central sections being vertically sliding. There is a painted brick ridge stack with chimney pots on either side of the porch. The gable ends of the main range have windows on each floor, with the left side being infilled and the right side having a plastic window on the ground floor. The rear elevation includes a gabled porch that is slightly offset to the left, above which is a rooflight, and a 2-light plastic window to the right. The interior was not inspected at the time of the survey.
Local climate
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
- 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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Nearby listed buildings
- Cottage/outbuilding at Tan-y-groeslon
- Nos.3 & 4 Ffrwd
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- Tanlan
- Cemetery Walls and Gates
- Tai Elen Glyn
- Northern Range to lower farmyard, including attached cross-range to east, at Glynllifon College Farm
- Parallel Farm Ranges and linking arched entrance into lower farmyard at Glynllifon College Farm
- Former Farm Office at Glynllifon College Farm
- Two parallel farmyard ranges to north-east corner of Glynllifon College Farm