Pen-Rhiw is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 October 1998. House.

Pen-Rhiw

WRENN ID
stark-iron-starling
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
21 October 1998
Type
House
Address
Pen-Rhiw, Cwm Onnau, Llangattock, Powys
OS grid reference
SO 189 167
Coordinates
51.84389, -3.17751
Source
Cadw listing

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

Description

Pen-Rhiw is a two-storey, two-window house with an attached byre, constructed from battered whitened rubble stone walls. The house features a slate roof and masonry end stacks that have been heightened in brick. There are added lean-tos at the rear. The front of the house includes a gabled porch on the right with a boarded and ribbed door set beneath an arched head. The window openings are offset to the left and have segmental stone heads and stone sills, with hoodmoulds on the lower storey. The windows on the right are wider, and all openings contain small-pane Breconshire windows. The cow house to the right is lower and has a roof that is partly covered with stone tiles and partly with slate. It features boarded doors under timber lintels on both the left and right sides of the centre. In the northern gable end, there is a loft hatch under a timber lintel, which is offset to the left, and below it is an added one-storey lean-to with a boarded door. The southern gable end is rendered and has a window offset to the left in the upper storey, along with a small bunker at ground level. At the rear, there are two added lean-tos; the one on the right is almost full height and includes a 20th-century red brick stack and a casement window. Behind the byre, there is another lean-to with a boarded door leading into the byre. There was no access to the interior at the time of inspection in December 1997.

Local climate

Pen-Rhiw sits in a wetter-than-average part of the UK, with an average of 1,120 mm of rain a year. This makes it wetter than 88% 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 51 freeze-thaw cycles a year, more than 92% of listed buildings. Of these, 27 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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