Retaining Wall for Church of St. Cwyfan is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 25 November 1998. Retaining wall.

Retaining Wall for Church of St. Cwyfan

WRENN ID
stranded-trefoil-dock
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
25 November 1998
Type
Retaining wall
Address
Retaining Wall for Church of St. Cwyfan, Porth Cwyfan, Aberffraw
OS grid reference
SH 335 682
Coordinates
53.1855, -4.49218
Source
Cadw listing

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

Description

The retaining wall for the Church of St. Cwyfan is a Grade II listed structure that surrounds a small island. It features rough rubble walls that are battered and angled to fit the irregular shape of the island. On the landward side, there are stone steps set into a curved inset, which are accompanied by a simple iron rail.

Local climate

Retaining Wall for Church of St. Cwyfan sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 11 freeze-thaw cycles a year, fewer than 90% of listed buildings. Of these, 3 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
  • 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

  1. Church of St. Cwyfan Grade II* 19 m
  2. Llangwyfan-isaf Grade II 1.0 km
  3. Church of St. Beuno Grade II* 1.8 km
  4. Pendref Grade II 1.9 km
  5. The Eagles Grade II 2.0 km
  6. Aberffraw Calvinistic Methodist Chapel Grade II 2.0 km
  7. Aberffraw Calvinistic Methodist Schoolroom and Chapel House Grade II 2.0 km
  8. Seion Methodist Chapel, including railings to forecourt Grade II 2.0 km
  9. Pont Aberffraw Grade II 2.1 km
  10. Tyn Towyn Grade II 2.9 km