Merther Uny Mill is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 17 June 1988. Water-mill. 1 related planning application.

Merther Uny Mill

WRENN ID
fallen-timber-sorrel
Grade
II
Local Planning Authority
Cornwall
Constituency
St Ives MP: Andrew George (LD)
Country
England
Date first listed
17 June 1988
Type
Water-mill
Address
Merther Uny Mill, Gweek, TR13 0NU
OS grid reference
SW 704 291
Coordinates
50.11805, -5.21309
Source
Historic England listing

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

Description

Merther Uny Mill is a water mill dating from the 18th century, with extensions made in the 19th century. The original rear wheel-pit wall is constructed from granite ashlar, while the rest of the building is made of granite rubble. The roof is partly covered with cedar shingles and features gable ends. The mill has a rectangular plan, with the older section on the right, which is roofless, and the 19th-century section on the left that includes an integral rear outshut. The front wall is likely from the 19th century and has been partly rebuilt. There are sockets for former machinery located in the rear left-hand corner of the older part.

The exterior is single storey, although it may have originally been two storeys. The irregular east front has a doorway at the far left and another towards the right. There is an early 19th-century 12-pane horizontally-sliding sash window on the left, along with blocked window openings on either side of the right-hand doorway.

Inside, no surviving machinery is visible, and the roofed part has not been inspected. Approximately 4 metres west of the wheel-pit wall, there is a dressed granite pier, which presumably supported the former launder from the leat.

Local climate

Merther Uny Mill 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.

More on this building

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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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