Maen-Du Well is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 16 December 1976. Well-house.

Maen-Du Well

WRENN ID
floating-rotunda-quill
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
16 December 1976
Type
Well-house
Address
Maen-Du Well, Powys
OS grid reference
SO 038 296
Coordinates
51.95689, -3.39995
Source
Cadw listing

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

Description

Maen-Du Well is a stone well-house with a rectangular plan. The roof is made of stone courses that rise from the wall heads to a pointed apex. There is a square-headed doorway in the center of the southern side, featuring a large lintel and rebates to the jambs. An inscription on the left jamb reads "WW 1754". Inside, rough steps lead down into the vaulted well house. There is a small outlet for water in the left return wall that leads to a rectangular pool with a stone surround. A winding channel, lined with stone, carries water down to a pond.

Local climate

Maen-Du Well sits in one of the wettest parts of the UK, with an average of 1,170 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 79% of listed buildings.

It experiences an average of 50 freeze-thaw cycles a year, more than 91% 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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