Former Flannel Mill is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 10 April 1989. Townhouse.

Former Flannel Mill

WRENN ID
sombre-string-bramble
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
10 April 1989
Type
Townhouse
Address
Former Flannel Mill, Llanidloes
OS grid reference
SN 952 845
Coordinates
52.44894, -3.54236
Source
Cadw listing

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

Description

The former flannel mill is a three-storey building, with the lower level built into the bank. It features rubble masonry with quoins, a modern flat roof, and cambered stock brick voussoirs above 9-pane hopper windows. The main elevation faces the river, where the lower masonry is coursed and has a slightly battered base. A vertical break rising to the second floor level to the right of the third bay indicates that the mill has been extended at the downstream end and raised by one storey, likely around 1850, coinciding with the construction of Short Bridge. At the base of this extension, there is a segmental-headed opening with rubble voussoirs, which is probably a spillway.

To the south, there is a largely collapsed rubble outbuilding near the weir, along with one brick infilled doorway at the top of the main end wall. The two-storey, four-bay elevation facing Short Bridge Street has boarded-up ground floor openings. The rear elevation has nine bays with boarded eaves and some boarded-up openings, as well as central openings at the left end. The building was disused at the time of inspection in March 1988, although the interior has been partly converted into a gym.

Local climate

Former Flannel Mill sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.

It experiences an average of 53 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 32 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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