Triangulation Pillar is a Grade II listed building in the Wiltshire local planning authority area, England. First listed on 10 October 1988. Triangulation pillar.
Triangulation Pillar
- WRENN ID
- sleeping-forge-sedge
- Grade
- II
- Local Planning Authority
- Wiltshire
- Constituency
- East Wiltshire MP: Danny Kruger (RUK)
- Country
- England
- Date first listed
- 10 October 1988
- Type
- Triangulation pillar
- Address
- Triangulation Pillar, Beacon Hill, Bulford
- OS grid reference
- SU 195 427
- Coordinates
- 51.18364, -1.72238
- Source
- Historic England listing
Description
The triangulation pillar, built around 1936, is located on Bulford Beacon Hill. It stands within an enclosure at the gun end of the original Principal Triangulation established in 1794. The pillar is made of concrete and has a square cone shape, topped with a bronze tripod base and featuring a benchmark on its side, at a height of 204 meters. The original triangulation point consists of an iron cannon set vertically 3 meters into the ground, with its muzzle filled, marking the north-east corner of the primary survey triangle for western England. This point is further protected by a 1.9-meter concrete kerb in the shape of a chamfered square, all situated within a triangular earthwork that includes a 2-meter-wide ditch. The triangulation point is 36,574 feet from the southern point near Old Sarum.
Local climate
Triangulation Pillar receives an average of 790 mm of rain a year. This makes it drier than 58% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 58% of listed buildings.
It experiences an average of 34 freeze-thaw cycles a year, more than 52% of listed buildings. Of these, 14 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.
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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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