The Holy Well and Cell is a Grade I listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 5 February 1952. Thatched house.

The Holy Well and Cell

WRENN ID
small-paling-flax
Grade
I
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
5 February 1952
Type
Thatched house
Address
The Holy Well and Cell, Penmon, Llangoed
OS grid reference
SH 630 807
Coordinates
53.30634, -4.05672
Source
Cadw listing

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

Description

The Holy Well and Cell is a Grade I listed structure featuring sub rectangular limestone foundations of a monk's cell that rise to about 0.5 meters in height. To the northeast of the cell, there is an ancient well, which now has a rectangular flagged forecourt surrounded by rough limestone walling and crude stone benches along the east and west sides. Above the well, there is a small building made of red brick and limestone, which is built into the cliff face to the west. This building has a shallow gabled roof and a single doorway that is offset to the west, along with a narrow vent slit to the east. The lower part of the wall is made of stone and is slightly battered, while the brickwork is weathered, with some remnants of the original render still visible.

Inside, the walls are rendered, and the open doorway leads into a rectangular chamber that contains a rectangular basin for the well set into the flagged stone floor. There are crude flagstone benches along the north and east walls, and rectangular recesses in the walls above. One of these recesses is said to have been partly blocked by a slate slab that featured a coronet above the initials and date B / R B 1710, although this slab is no longer present.

Local climate

The Holy Well and Cell sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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Nearby listed buildings

  1. Priory Church of St Seiriol Grade I 65 m
  2. Priory House Grade II* 79 m
  3. Priory house outbuilding Grade II 81 m
  4. Refectory at Penmon Priory Grade I 85 m
  5. Dovecote and barn at Penmon Priory Grade II* 96 m
  6. Enclosure walls at former pilots' cottages for Trwyn Du, or Black Point, Lighthouse Grade II 1.1 km
  7. Pilot's Cottage (former) No 1 Grade II 1.1 km
  8. Pilot's Cottage (former No 2) Grade II 1.1 km
  9. Trwyn Du, or Black Point, Lighthouse Grade II* 1.3 km
  10. Plas Newydd Grade II 1.5 km