Triangular Folly is a Grade II listed building in the Plymouth local planning authority area, England. First listed on 9 November 1998. Folly.
Triangular Folly
- WRENN ID
- south-sandstone-summer
- Grade
- II
- Local Planning Authority
- Plymouth
- Constituency
- South West Devon MP: Rebecca Smith (Con)
- Country
- England
- Date first listed
- 9 November 1998
- Type
- Folly
- Address
- Triangular Folly, Cornwood Road, City of Plymouth
- OS grid reference
- SX 559 556
- Coordinates
- 50.38317, -4.02745
- Source
- Historic England listing
Description
The Triangular Folly is a structure likely built in the late 18th century. It features walls made of slatestone rubble, accented with slate string courses and a parapet that has corner merlons. Designed in a simple Gothic style, the folly has a triangular plan with entrances on two sides. It consists of three stages, with pointed arched doorways on the lower stage and blind pointed arches on the stage above.
Local climate
Triangular Folly receives an average of 940 mm of rain a year. This makes it wetter than 72% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 89% 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 0.3°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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