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

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

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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  • Detailed attributes — period, style, materials, features
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  • 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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  1. Cottage/outbuilding at Tan-y-groeslon Grade II 15 m
  2. Nos.3 & 4 Ffrwd Grade II 84 m
  3. North Lodge Grade II 97 m
  4. Tanlan Grade II 469 m
  5. Cemetery Walls and Gates Grade II 516 m
  6. Tai Elen Glyn Grade II 589 m
  7. Northern Range to lower farmyard, including attached cross-range to east, at Glynllifon College Farm Grade II 679 m
  8. Parallel Farm Ranges and linking arched entrance into lower farmyard at Glynllifon College Farm Grade II 690 m
  9. Former Farm Office at Glynllifon College Farm Grade II 690 m
  10. Two parallel farmyard ranges to north-east corner of Glynllifon College Farm Grade II 695 m