Garden Wall at Penllwyn is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 31 March 1999. Garden wall.

Garden Wall at Penllwyn

WRENN ID
stubborn-pedestal-sunrise
Grade
II
Local Planning Authority
Caerphilly
Constituency
Caerphilly MP: Chris Evans (Lab)
Country
Wales
Date first listed
31 March 1999
Type
Garden wall
Address
Garden Wall at Penllwyn, Pontllanfraith
OS grid reference
ST 173 955
Coordinates
51.65285, -3.19579
Source
Cadw listing

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

Description

The garden wall at Penllwyn is a Grade II listed structure made of rubble with rough stone coping, surrounding the former garden of the manor house. The highest section is at the front, where the wall steps out to create an entrance bay that roughly mirrors the house's frontage. This section is raised to form piers that support a segmental arched pegged boarded gate with heavy hinges. The wall extends down the hillside and to the rear, where it is interrupted by a breeze block recess. It continues along the uphill side to the west, where there is a wide entrance opening.

Local climate

Garden Wall at Penllwyn sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.

It experiences an average of 44 freeze-thaw cycles a year, more than 85% of listed buildings. Of these, 21 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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  • 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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