Barn at Brynderwen is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 August 1998. Barn. 2 related planning applications.

Barn at Brynderwen

WRENN ID
calm-foundation-pearl
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 August 1998
Type
Barn
Address
Barn at Brynderwen, Tal-Y-Llyn, Llangors, Powys, LD3 7SY
OS grid reference
SO 107 271
Coordinates
51.93612, -3.29972
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, likely dating from the 18th century, with two cart bays incorporated into its right side. The barn is constructed of limewashed stone rubble, with a Welsh slate roof and corrugated metal sheeting. The main barn range features opposing double doors with a hood above, and a single row of ventilation slits – two on the left and one on the right – set high in the walls. Smaller ventilators are also present in the gable end walls. The cart bays are distinguished by their wide, elliptical arches.

Inside, the barn has a lofted space and is divided by a stone wall that separates the cart bays below. The roof structure features tie beams and collars, connected with lap dovetail joints, and three rows of trenched purlins.

Local climate

Barn at Brynderwen 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 — 4 transactions since 2012
  • 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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