Tregonwell Mill is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 22 June 1987. Miller's house.
Tregonwell Mill
- WRENN ID
- peeling-lantern-honey
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- St Ives MP: Andrew George (LD)
- Country
- England
- Date first listed
- 22 June 1987
- Type
- Miller's house
- Address
- Tregonwell Mill, Manaccan
- OS grid reference
- SW 763 247
- Coordinates
- 50.0804, -5.12729
- Source
- Historic England listing
Description
Tregonwell Mill is a miller's house dating from the 18th century. It features painted stone rubble and cob walls, slate sills, chamfered wooden lintels, and a scantle slate roof with a brick chimney located over the left gable end and the party wall on the right side of the middle. The building has an overall T-shaped plan consisting of three rooms plus an outshut: a kitchen on the left with a large fireplace, a central parlour, and an unheated service room on the right at a slightly lower level, which includes an integral pantry outshut now containing a stair behind the parlour.
The house is two storeys high with a four-window south-west front that shows slight irregularity, featuring a two-window house on the left and a 20th-century rebuilt front on the service end to the right. The front has a wide central doorway with a top-glazed ledged door and a slated hood above, along with wide window openings supported by oak lintels made from reused ship timbers with treenails. There is an old ledged door to a doorway on the left side of the service end, and the windows are primarily 2-light casements with glazing bars, except for a 3-light casement at the rear of the outshut.
Inside, the mill retains original roughly-chamfered cross beams, a large hearth, and niches from blocked windows in the rear wall of the left-hand room. There is also a 2-panel door leading into the right-hand room from the outshut. The first floor and roof have not been inspected.
Local climate
Tregonwell 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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- 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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