Heniarth Mill is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 19 September 2002. Mill, miller's house.
Heniarth Mill
- WRENN ID
- heavy-dormer-thistle
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 19 September 2002
- Type
- Mill, miller's house
- Address
- Heniarth Mill, Llangyniew
- OS grid reference
- SJ 123 080
- Coordinates
- 52.66323, -3.298
- Source
- Cadw listing
Description
Heniarth Mill is a three-storey mill built at right angles to the millstream from the Afon Banwy, with an adjoining three-storey miller's house on the west side facing north. There is also a shed, which has been raised to two storeys, forming the east wing of the mill. The building is constructed of slatey stone with limestone quoins, featuring slate roofs with tile ridges and a central chimney on the house. The stonework of the mill differs from that of the house, suggesting that they may not have been built at the same time.
The north gable elevation of the mill features modern doors at the ground and first storeys, with a casement window located high in the gable above a date stone. The door and window openings are adorned with stone arches.
The front elevation of the house consists of a two-window range, with mullion windows on the top storey and mullion and transom windows on the ground and first storeys, all with cambered brick window heads. There is a glazed porch from the 19th or 20th century on a red brick plinth at the front door.
The shed on the left has been recently enlarged and includes a boarded door at the front.
Local climate
Heniarth Mill receives an average of 950 mm of rain a year. This makes it wetter than 73% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 67% of listed buildings.
It experiences an average of 39 freeze-thaw cycles a year, more than 76% of listed buildings. Of these, 20 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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