Holy Well of Saint Mawnan is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 17 June 1988. A C19 Well.
Holy Well of Saint Mawnan
- WRENN ID
- sombre-balcony-pearl
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- Camborne and Redruth MP: Perran Moon (Lab)
- Country
- England
- Date first listed
- 17 June 1988
- Type
- Well
- OS grid reference
- SW 786 273
- Coordinates
- 50.10511, -5.09639
- Source
- Historic England listing
Description
The Holy Well of Saint Mawnan is a holy well, likely rebuilt in the 19th century, which originates from an ancient spring-fed well. It features retaining walls made of killas rubble. The well is covered by a barrel vaulted chamber that contains a sump fed by a spring. The doorway of the well is framed by a rubble triangular arch that leads into the barrel vault. Above the doorway, there is a reused medieval carved head.
Local climate
Holy Well of Saint Mawnan receives an average of 850 mm of rain a year. This makes it wetter than 59% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 84% of listed buildings.
It experiences an average of 7 freeze-thaw cycles a year, fewer than 95% 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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- 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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