20, Duke Street is a Grade II listed building in the Cornwall local planning authority area, England. A C18 House.
20, Duke Street
- WRENN ID
- sunken-steel-snow
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- North Cornwall MP: Ben Maguire (LD)
- Country
- England
- Type
- House
- Address
- 20, Duke Street, Launceston
- OS grid reference
- SX 323 856
- Coordinates
- 50.6466, -4.3733
- Source
- Historic England listing
Description
No. 20 Duke Street is a village house that dates from the 18th century or possibly earlier. The front features slate hanging over a rubble plinth, and it has a hipped and sprocketted rag slate roof with paired brackets supporting the projecting front eaves. There are two rendered lateral stacks at the rear and a rubble stack at the rear gable of the wing. The house has a shallow-depth plan with a wing at the rear left and is two storeys tall with a four-window range. The first floor has tall 18-pane hornless sash windows from the 18th century or early 19th century, while the ground floor features early 19th-century sixteen-pane hornless sash windows. There is a segmental-arched rendered porch under the second window from the left, leading to a six-panel door. Inside, there is an original dog-leg staircase with a closed string, turned balusters, and a moulded handrail. The ceiling in the right-hand room is lower than the window heads, indicating that the house may have been refronted in the 18th century.
Local climate
20, Duke Street sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 84% 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
- 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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