Hen Dwr is a Grade II listed building in the Conwy local planning authority area, Wales. First listed on 10 January 1951. Windmill tower.

Hen Dwr

WRENN ID
endless-cinder-lichen
Grade
II
Local Planning Authority
Conwy
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
10 January 1951
Type
Windmill tower
Address
Hen Dwr, Llandudno
OS grid reference
SH 804 811
Coordinates
53.31389, -3.79646
Source
Cadw listing

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

Description

Hen Dwr is a two-storey windmill tower that features a two-storey extension and a larger modern attached extension. The mill tower tapers and is pebbledashed, topped with a pointed slate roof and a brick chimney. It has windows at two levels with modern glazing. The small two-storey extension is made from matching materials and also includes a brick chimney. The larger late 20th-century extension is not included in the listing.

Inside the old tower, the ground floor room has two exposed beams, while the upper floor features a single stop-chamfered beam.

Local climate

Hen Dwr sits in a wetter-than-average part of the UK, with an average of 1,100 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 76% of listed buildings.

It experiences an average of 34 freeze-thaw cycles a year, fewer than 51% of listed buildings. Of these, 18 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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