Barn at Pentwyn is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Barn.

Barn at Pentwyn

WRENN ID
idle-gargoyle-barley
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
17 December 1998
Type
Barn
Address
Barn at Pentwyn, Llanfeugan, Talybont-On-Usk, Powys
OS grid reference
SO 080 249
Coordinates
51.91504, -3.33894
Source
Cadw listing

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

Description

The barn at Pentwyn is a 19th-century structure made of stone rubble with regular quoins and a corrugated roof. It features four bays and has full-height double opposing doors located to the centre left, although these doors are now blocked. There is a hipped-roofed porch bay on the outer side, along with an added lean-to. The barn includes two rows of ventilation slits on the sides and four slits at the downhill gable end.

Attached to the uphill side is a later range that has a shallower roof pitch and brick dressings. Inside, there is a flagged threshing floor and the roof is supported by pegged collar and tie roof trusses, along with three rows of trenched purlins.

Local climate

Barn at Pentwyn 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 78% of listed buildings.

It experiences an average of 57 freeze-thaw cycles a year, more than 96% 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.

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