Grotto Underpass is a Grade II listed building in the Wiltshire local planning authority area, England. Underpass.
Grotto Underpass
- WRENN ID
- burning-gallery-dust
- Grade
- II
- Local Planning Authority
- Wiltshire
- Constituency
- South West Wiltshire MP: Dr Andrew Murrison (Con)
- Country
- England
- Type
- Underpass
- Address
- Grotto Underpass, Stourton with Gasper
- OS grid reference
- ST 774 338
- Coordinates
- 51.10384, -2.32318
- Source
- Historic England listing
Description
The Grotto Underpass is an underpass designed for a path leading to the Temple of Apollo, located below Zeals Road. It was built between 1760 and 1765 for Henry Hoare. The structure features a curving tunnel with rustic rockwork portals that include large voussoirs. The path continues uphill through a cutting, which is topped with a single rockwork arch. This underpass is likely contemporary with the Rockwork Bridge over Zeals Road, as both are part of the same route to the Temple of Apollo.
Local climate
Grotto Underpass receives an average of 850 mm of rain a year. This makes it wetter than 58% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 62% of listed buildings.
It experiences an average of 35 freeze-thaw cycles a year, more than 60% of listed buildings. Of these, 16 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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