Greywell Tunnel Portal is a Grade II listed building in the Hart local planning authority area, England. First listed on 20 November 1985. Tunnel portal.
Greywell Tunnel Portal
- WRENN ID
- watchful-panel-briar
- Grade
- II
- Local Planning Authority
- Hart
- Constituency
- North East Hampshire MP: Alex Brewer (LD)
- Country
- England
- Date first listed
- 20 November 1985
- Type
- Tunnel portal
- Address
- Greywell Tunnel Portal, Basingstoke Canal
- OS grid reference
- SU 718 514
- Coordinates
- 51.25765, -0.97118
- Source
- Historic England listing
Description
The Greywell Tunnel Portal is a Grade II listed structure located on the Basingstoke Canal, built in 1792. It serves as the entrance to the canal tunnel, which runs westward. The portal features a facade made of red brick in English bond, with a round arched opening that includes a stone keystone and impost blocks. The parapet slopes from the center and is supported by brick bracketting, leading to rusticated square piers on either side. On each side of the portal are rounded panels, and above the arch is a rectangular panel that displays a plaque stating: "GREYWELL TUNNEL BUILT 1792. Length 1230 yards." The portal was restored in 1975 and includes brick cutwaters.
Local climate
Greywell Tunnel Portal receives an average of 750 mm of rain a year. This makes it drier than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 62% of listed buildings.
It experiences an average of 33 freeze-thaw cycles a year, fewer than 53% 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.
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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