Fort Cumberland is a Grade II* listed building in the Portsmouth local planning authority area, England. First listed on 30 October 1969. A 18th century Fort. 2 related planning applications.

Fort Cumberland

WRENN ID
winding-pier-dust
Grade
II*
Local Planning Authority
Portsmouth
Constituency
Portsmouth South MP: Stephen Morgan (Lab)
Country
England
Date first listed
30 October 1969
Type
Fort
Period
18th century
Address
Fort Cumberland, Fort Cumberland Road, City of Portsmouth, PO4 9LD
OS grid reference
SZ 682 991
Coordinates
50.78779, -1.03267
Source
Historic England listing

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

Description

Fort Cumberland is a fort built in 1746 by the Duke of Cumberland and reconstructed in 1786 by the Duke of Richmond, with some alterations and additions in the 19th century. The structure is made of stone and brick and was originally designed in the shape of a five-angled star. After its reconstruction in 1786, it took on its current form, featuring a wide pentagonal rampart with five sharply angled bastions at each point, a dry moat, a glacis, and one ravelin. The ramparts are faced with stone on the outside and have brick parapets, with segmental arched gun ports that conceal deep tunnel-vaulted brick casemates covered with several feet of earth. Historically, the fort is a direct descendant of the bastioned fortress design that originated in Italy in the late 15th century and represents the final development of this architectural style in Britain. It is considered one of the best examples of 18th-century defensive architecture remaining in the country and is designated as a Scheduled Ancient Monument.

Local climate

Fort Cumberland receives an average of 820 mm of rain a year. This makes it wetter than 51% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.

It experiences an average of 18 freeze-thaw cycles a year, fewer than 82% 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 — 2 applications
  • 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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