The Grotto, About 1/2 Mile South East of Menabilly House at Polridmouth is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 13 March 1951. Folly.
The Grotto, About 1/2 Mile South East of Menabilly House at Polridmouth
- WRENN ID
- peeling-marble-barley
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- St Austell and Newquay MP: Noah Law (Lab)
- Country
- England
- Date first listed
- 13 March 1951
- Type
- Folly
- Address
- The Grotto, About 1/2 Mile South East of Menabilly House at Polridmouth, Fowey
- OS grid reference
- SX 102 505
- Coordinates
- 50.32396, -4.66652
- Source
- Historic England listing
Description
The Grotto, located about half a mile southeast of Menabilly House at Polridmouth, is a late 18th-century octagonal folly. It is constructed from rounded quartz boulders, with the joints snecked with sea shells. The interior walls were originally lined with shells, crystal ores, and polished stones, although most of these have been removed. The structure features two blocked four-centred arch openings and small gable heads on each wall. Currently, it is roofless and in a poor state of repair.
Local climate
The Grotto, About 1/2 Mile South East of Menabilly House at Polridmouth sits in a wetter-than-average part of the UK, with an average of 990 mm of rain a year. This makes it wetter than 80% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.
It experiences an average of 10 freeze-thaw cycles a year, fewer than 91% of listed buildings. Of these, 4 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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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