Llanddetty Hall barn and attached ranges is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Barn and attached ranges. 2 related planning applications.

Llanddetty Hall barn and attached ranges

WRENN ID
silent-wicket-wren
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 and attached ranges
Address
Llanddetty Hall barn and attached ranges, Llanddetti, Talybont-On-Usk, Powys, LD3 7YR
OS grid reference
SO 124 205
Coordinates
51.87696, -3.273
Source
Cadw listing

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

Description

This is a large barn of stone rubble construction with a corrugated roof. It features two sets of opposing double doorways supported by shallow timber lintels, as well as a smaller door and opening leading to the farmyard. Attached to the right of the barn is a cross range built of rubble with a Welsh slate roof, likely originally a carriage shed, separate dairy, and/or salting room. This range has renewed open bays on the farmyard side, while its outward-facing elevation has a series of pointed-arch Gothick metal-framed windows with brick voussoirs. The gable end of this range, facing the house, has two doors, with a bricked-up pitching door leading to the first floor. A further cross range to the right has been altered to create an open cowshed adjacent to the barn and connects to an adjoining stone building, potentially linked to an earlier 17th-century structure at Llanddetty Hall. The main barn range has two rows of pigeon holes, stepped back another 10 holes.

Inside the barn, there are 10 bays with collar and tie beam trusses and trenched purlins. The floor is a mix of cobbled, flagstone, and earth surfaces.

Local climate

Llanddetty Hall barn and attached ranges 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.

More on this building

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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 2 transactions since 2002
  • Related listed building consents — 2 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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