Port Isaac Mill is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 26 June 1987. Watermill. 1 related planning application.
Port Isaac Mill
- WRENN ID
- riven-hammer-ivory
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- North Cornwall MP: Ben Maguire (LD)
- Country
- England
- Date first listed
- 26 June 1987
- Type
- Watermill
- Address
- Port Isaac Mill, St. Endellion, PL29 3RX
- OS grid reference
- SW 999 802
- Coordinates
- 50.58718, -4.82782
- Source
- Historic England listing
Description
Port Isaac Mill is a watermill that has been converted for use as a calves house and pigs house. It likely dates from the mid-19th century, although a coin dated 1739 was found buried in the masonry. The building is constructed of stone rubble with brick dressings around the openings and features a slate roof with a gable end on the left and a hipped end on the right. It is two storeys high. The front elevation shows the shaft of the wheel projecting, although the undershot wheel is no longer present. The ground rises to the left, providing access to the loft. The rear elevation faces the farmyard and also has brick dressings to the openings. The building was in a state of dereliction in the 1970s, but since then, the first floor and several roof trusses have been replaced. There are three pairs of millstones still in place, although the remaining machinery has been partly damaged and is not operational.
Local climate
Port Isaac Mill sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 94% of listed buildings.
It experiences an average of 8 freeze-thaw cycles a year, fewer than 93% of listed buildings. Of these, 3 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.
- No sale records on file
- Related listed building consents — 1 application
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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