Pigsties at Grugan Ddu is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 September 1999. Pigsties.

Pigsties at Grugan Ddu

WRENN ID
silent-gateway-heath
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 September 1999
Type
Pigsties
Address
Pigsties at Grugan Ddu, Groeslon, Llandwrog
OS grid reference
SH 472 554
Coordinates
53.07443, -4.28206
Source
Cadw listing

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

Description

The pigsties at Grugan Ddu are a small, rectangular structure with gable ends, featuring yards on the south side. They are built from roughly coursed rubblestone and topped with a slate roof. The pigsties have doorways at the front that lead into two yards, which are separated by vertical slate slabs acting as a dividing wall. In front of the wall, there are V-shaped slate troughs.

Local climate

Pigsties at Grugan Ddu 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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  1. Grugan Ddu Grade II 20 m
  2. Former reservoir on hill to north-east of Fort Williamsburg Grade II 666 m
  3. Boundary Wall to Glynllifon Park Grade II 699 m
  4. East Lodge Grade II 853 m
  5. Mausoleum Grade II 956 m
  6. Rubble Footbridge uphill from Hermitage Grade II 963 m
  7. Penrallt Grade II 967 m
  8. High Bridge carrying road over East Drive and Afon Llifon Grade II 975 m
  9. Washouses to Nos. 1 & 2 Penrallt Grade II 980 m
  10. Rubble Footbridge below the Hermitage Grade II 1.0 km