Dee Mill is a Grade II listed building in the Denbighshire local planning authority area, Wales. First listed on 22 December 1989. School.

Dee Mill

WRENN ID
small-paling-rush
Grade
II
Local Planning Authority
Denbighshire
Constituency
Clwyd East MP: Becky Gittins (Lab)
Country
Wales
Date first listed
22 December 1989
Type
School
Address
Dee Mill, Llangollen
OS grid reference
SJ 214 421
Coordinates
52.97073, -3.17124
Source
Cadw listing

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

Description

Dee Mill is a three-storey building constructed from rubble with freestone quoins, featuring a slate roof, a red brick chimney stack, and a tiled ridge. The building has a roughly L-shaped plan. The front, which faces Dee Lane, has two windows; to the left are Victorian casements with red brick dressings, while the right side has modern windows. There is a stable door entrance on the left.

The other range of the mill projects forward at a right angle and has a one-window elevation facing east up Dee Lane, featuring three-light windows and a datestone on the first floor. Below this, to the left, is a modern opening. The tall and broad gable end to the left faces up Greenfield and includes a four-pane window at the top and a deep window below, which was formerly a loading door, as indicated by the worn stone cill and a four-pane overlight.

The left side of the building is finished in pebbledash and has brace plates with two doors near water level. There is a covered walkway and a lower later range to the left behind the weir. The right gable end is also pebbledash and features an attached single-storey corrugated iron range with sash windows. The cross range at the rear projects slightly and has a one-window elevation. The mill was formerly topped with a large chimney stack, as shown in old photographs.

Internally, the ground floor features sturdy timber piers arranged in a semicircle to support the heavy machinery that was once above, near the waterwheel. The timber undershot wheel is encased within the building. The drive shafts and pulleys are still in place, along with a crane on the top attic floor, which has a two-bay king post roof and a piece of machine-sawn timber dated 1207, complete with carpenter's marks.

Local climate

Dee Mill receives an average of 920 mm of rain a year. This makes it wetter than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 73% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 28 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
  • Sale history — 1 transaction since 2024
  • 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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