Old Mathematical School is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 9 February 1994. Educational institution.
Old Mathematical School
- WRENN ID
- north-vault-weasel
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- St Ives MP: Andrew George (LD)
- Country
- England
- Date first listed
- 9 February 1994
- Type
- Educational institution
- Address
- Old Mathematical School, Penellaz Hill, Helston
- OS grid reference
- SW 655 275
- Coordinates
- 50.10174, -5.27923
- Source
- Historic England listing
Description
The Old Mathematical School in Helston is a former literary and scientific institute, now part of the freemasons' hall. It was built in 1799 and features a facade of coursed greenstone with granite dressings, including an ashlar plinth, quoins, jambstones, voussoirs, a mid-floor string, and a triangular pediment at the front with scrolled kneelers. The building has an asbestos slate roof and a rectangular plan, standing two storeys tall. The principal first-floor has round-arched window openings, with the front end being blind and a four-window range on the right-hand return. There are two 12-pane horned sash windows on the left, while two openings on the right have been blocked with brick. The pedimented gable is a prominent feature of the Helston townscape and signifies an important phase in the town's social history, coinciding with the prosperity brought by the tin mining industry and the construction of fine villas in the area, such as those on Cross Street.
Local climate
Old Mathematical School receives an average of 870 mm of rain a year. This makes it wetter than 63% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 3 freeze-thaw cycles a year, fewer than 99% of listed buildings. Of these, 1 follows at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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.
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- 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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