St Mary's Well is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 18 June 1998. House.
St Mary's Well
- WRENN ID
- fallow-gutter-amber
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 18 June 1998
- Type
- House
- Address
- St Mary's Well, Nefyn, Pwllheli
- OS grid reference
- SH 307 405
- Coordinates
- 52.93591, -4.52017
- Source
- Cadw listing
Description
St Mary's Well is a well superstructure built from squared rubble stone, featuring a square plan and a stone pyramidal roof topped with a bronze or copper finial. Each side of the structure has a blank recessed arch with raised rusticated surrounds and raised angle quoins. Above the pyramid roof, there is a plain projecting course, and the roof itself is adorned with tooled stone blocks at the angle ridges and a square apex piece beneath the finial.
Each face of the well has a stone steep gablet with a slate plaque inscribed with the following: on the southwest and northeast sides, it reads "1868 St Mary's Ffynnon Well Fair Rebuilt by the Ailadeiladwyd Corporation of Gan Nefyn Gorfforaeth Nefyn" with the names Robert Thomas and John Jones listed as bailiffs. The southeast side, facing the road, includes the inscription "The Right Honourable Lord Newborough Mayor Hugh Hughes Deputy Mayor John Wilson Recorder."
The rear features a blank plaque and a small boarded door. There are iron railings and a gate on the northeast side, leading down approximately four steps to a sunken area.
Local climate
St Mary's Well sits in one of the wettest parts of the UK, with an average of 1,660 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.
It experiences an average of 3 freeze-thaw cycles a year, fewer than 99% of listed buildings. Of these, 1 follows 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- 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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