Admiralty boundary stone, Fort Blockhouse is a Grade II listed building in the Gosport local planning authority area, England. First listed on 13 November 2020. Boundary stone. 1 related planning application.

Admiralty boundary stone, Fort Blockhouse

WRENN ID
scattered-grate-mist
Grade
II
Local Planning Authority
Gosport
Constituency
Gosport MP: Dame Caroline Dinenage (Con)
Country
England
Date first listed
13 November 2020
Type
Boundary stone
Address
Admiralty boundary stone, Fort Blockhouse, Haslar Road, Hampshire, PO12 2AB
OS grid reference
SZ 624 991
Coordinates
50.78825, -1.11474
Source
Historic England listing

Also on this page: related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Admiralty boundary stone, erected in 1774, is located near the entrance to Fort Blockhouse. It is carved from Portland stone and positioned next to the sea wall at the neck of the peninsula leading to the fort, beyond the site of the original redan and outer works. The stone is rectangular with a pointed top. Although it has weathered significantly, the front (north-east) face still shows faint outlines of several incised inscriptions, including the royal cypher GR (George Rex) with the date 1774 beneath it, and the Admiralty anchor motif below.

Local climate

Admiralty boundary stone, Fort Blockhouse receives an average of 810 mm of rain a year. This makes it drier than 52% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 77% of listed buildings.

It experiences an average of 19 freeze-thaw cycles a year, fewer than 79% of listed buildings. Of these, 8 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
  • Related listed building consents — 1 application
  • 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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