Glanonney is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 October 1998. House. 5 related planning applications.

Glanonney

WRENN ID
winding-floor-sepia
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
Glanonney, Llangattock, Powys, NP8 1HU
OS grid reference
SO 209 176
Coordinates
51.85147, -3.14903
Source
Cadw listing

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

Description

Glanonney is a two-storey building with a three-window range, featuring gables above the upper storey windows. The front is covered in stucco, and it has a slate roof with red ridge tiles. There are masonry stacks at both ends and a third stack positioned just to the right of the center, all featuring two diagonally-set shafts. The building has additional ranges on both the left and right sides, with the left range being the earlier house.

In front of Glanonney, there is a veranda with a slate roof supported by four cast iron piers made of narrow shafts. The ground floor includes a ribbed and panelled front door on the left, which is recessed under a four-centred arch and has mouldings around the reveals. To the right of the door is a bay window that now contains French doors with margin glazing. Left of center is a canted bay window featuring a four-light mullioned and transomed window. The first floor has square three-light windows with wedge lintels, which are under hoodmoulds that have square stops. The gables also have blind recesses with similar hoodmoulds, and there is a gable at the eastern end of the range.

The earlier house on the left is set forward and consists of a two-window, two-storey range. It is also stuccoed and has a battered base, with a renewed slate roof and rendered end stacks. In front of this house is a two-span single-storey projection, and there is a lean-to at the western end. The upper storey features early 19th-century twelve-pane sash windows. The front projection has two nine-pane windows, a half-lit door at its eastern end, and a four-pane window at the western end.

Adjoining the right gable end of Glanonney is an L-shaped, one-storey range made of snecked masonry under a slate roof, with a central masonry stack. There is a 20th-century half-lit door in the center within an earlier opening. The advanced cross-gable to the left has a large tripartite window with sandstone mullions and horned sashes, and above it is a diamond sandstone tablet. The eastern gable end features a twelve-pane sash window with another diamond tablet above.

Access to the interior was not available at the time of inspection in August 1997.

Local climate

Glanonney sits in a wetter-than-average part of the UK, with an average of 1,020 mm of rain a year. This makes it wetter than 81% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 71% of listed buildings.

It experiences an average of 50 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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  • No EPC on record for this property
  • Sale history — 1 transaction since 1999
  • Related listed building consents — 5 applications
  • 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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