The Undercroft is a Grade II* listed building in the Southampton local planning authority area, England. First listed on 14 July 1953. A Medieval Undercroft.
The Undercroft
- WRENN ID
- iron-lintel-fen
- Grade
- II*
- Local Planning Authority
- Southampton
- Constituency
- Southampton Itchen MP: Darren Paffey (Lab)
- Country
- England
- Date first listed
- 14 July 1953
- Type
- Undercroft
- Period
- Medieval
- Address
- The Undercroft, Siminel Street, City of Southampton
- OS grid reference
- SU 418 113
- Coordinates
- 50.90013, -1.40569
- Source
- Historic England listing
Description
The Undercroft is an early 14th century ground floor room, or undercroft, of a medieval house believed to have been constructed by a stone mason from Beaulieu Abbey. It is built of stone rubble and features an arched doorcase leading down eight steps. There are three windows: one is a single light window with a shouldered head, while the other two are 2-light windows, also with shouldered heads. Originally, the undercroft served as a shop, with living accommodation above. The space is notable for its two intersecting quadripartite rib vaults, which include two fine bosses, one likely depicting the Head of Christ and the other a female head. There is a stone hooded fireplace adorned with ball flower ornamentation and a 15th century brick floor. Above the undercroft, there are a pair of brick council houses built in 1902, which are the first in Southampton but do not hold special architectural interest. This undercroft is recognized as the most elaborate of the surviving stone vaulted undercrofts in Southampton and is scheduled as an ancient monument.
Local climate
The Undercroft receives an average of 830 mm of rain a year. This makes it wetter than 53% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.
It experiences an average of 18 freeze-thaw cycles a year, fewer than 82% of listed buildings. Of these, 7 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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