Great House Barn is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 20 November 1989. A C19 Barn.

Great House Barn

WRENN ID
odd-beam-twilight
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
20 November 1989
Type
Barn
Address
Great House Barn, Talgarth, Powys
OS grid reference
SO 154 338
Coordinates
51.99689, -3.23331
Source
Cadw listing

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

Description

Great House Barn is an early to mid-19th century building. It is two storeys high and features a mix of Flemish and English bond brickwork, with plain pilasters on the south range and at the corners of the west range. The barn has rubble stone plinths and internal facings, slate roofs, although the rear east pitch is covered with corrugated asbestos, and it has plain wooden bargeboards.

The east range runs north to south and includes tall double wooden cartway doors divided into two parts at the re-entrant angle. An added rubble stone external stair leads to a boarded loft door, which partly obscures one of two cartshed openings that have segmental relieving arches over timber lintels. There are twin recessed arched openings on the south gable end, above which are tiered pigeon nest holes. The east side consists of six bays separated by pilasters, featuring vents and tall wooden cart doors on the opposite side. The west arm has three smaller arched openings on the ground floor, one of which is blocked, along with ventilation slits and loft openings; the west end gable has ventilation slits on two levels and a loft opening above. There is a rubble stone and corrugated iron lean-to on the north side, at the west end, and a 20th-century concrete block addition further along, facing Cottage Lane.

Inside, the barn retains lightweight trusses that are blackened, with collars, raking braces, and tie-beams resting on wall plates. It has two tiers of purlins, brickwork dressings, and timber lintels. There is a half floor within the south end. The cowhouse in the west range has a loft above and some timber strapping in the upper walls.

Local climate

Great House Barn sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 82% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 68% of listed buildings.

It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 29 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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  • 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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