Summerhouse Fort is a Grade II listed building in the Vale of Glamorgan local planning authority area, Wales. First listed on 16 December 2004. Fortification.
Summerhouse Fort
- WRENN ID
- ruined-terrace-jet
- Grade
- II
- Local Planning Authority
- Vale of Glamorgan
- Constituency
- Vale of Glamorgan MP: Kanishka Narayan (Lab)
- Country
- Wales
- Date first listed
- 16 December 2004
- Type
- Fortification
- Address
- Summerhouse Fort, Boverton, Cowbridge / Y Bont-Faen, Llantwit Major
- OS grid reference
- SS 994 664
- Coordinates
- 51.38847, -3.44698
- Source
- Cadw listing
Description
Summerhouse Fort is a structure built from local limestone rubble, designed as an octagonal curtain wall approximately 2 meters high. It features corner towers, at least one of which on the north side appears to have served as a privy. The overall design of the walls and towers is unclear due to damage and heavy ivy coverage, but there are indications of small battlements resembling a cock-and-hen parapet in certain areas. On the east side, there is a small barn-like building integrated into the curtain wall. This building is unroofed and lacks distinctive features aside from a doorway, but it does include a World War II gun-loop located at the north corner.
Local climate
Summerhouse Fort sits in a wetter-than-average part of the UK, with an average of 1,160 mm of rain a year. This makes it wetter than 89% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.
It experiences an average of 13 freeze-thaw cycles a year, fewer than 87% of listed buildings. Of these, 5 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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