Flagship House is a Grade II listed building in the Portsmouth local planning authority area, England. House. 3 related planning applications.

Flagship House

WRENN ID
woven-sill-summer
Grade
II
Local Planning Authority
Portsmouth
Constituency
Portsmouth South MP: Stephen Morgan (Lab)
Country
England
Type
House
Address
Flagship House, 36, St Thomas's Street, City of Portsmouth, PO1 2EZ
OS grid reference
SZ 633 994
Coordinates
50.79145, -1.1025
Source
Historic England listing

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

Description

Flagship House is a late 18th and early 19th century house on the south-east side of St Thomas’s Street, Portsmouth. The house is built of grey brick in a header bond pattern, with red brick dressings around the windows and quoins. The roof is hidden, and there's a brick chimney stack to the right. The building has three storeys and a basement, with a single bay facing the street. To the left of the façade, three stone steps lead up to a late 20th century door within a wooden surround, featuring flanking pilasters and a flat entablature. A 16-pane sash window is located to the right, and on the second floor is a 12-pane sash window, which is unequally hung. Both windows are set within gauged brick arches. A brick dentil band with a stone capping runs above the second floor. A stone-coped parapet tops the building. The interior of the house has not been inspected.

Local climate

Flagship House 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 3 transactions since 2006
  • Related listed building consents — 3 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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  2. 44 and 45, St Thomas's Street Grade II 68 m
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  5. 47 and 48, St Thomas's Street Grade II 85 m
  6. Carlton House Grade II 93 m
  7. 16, High Street Grade II 95 m
  8. Pair of Former Gas Lamp Standards in Front of George Court Grade II 96 m
  9. Coopers House Grade II 98 m
  10. Rockingham (Number 14) and Nelson House (Number 15) Grade II 103 m