Barn at Ty Mawr 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 Ty Mawr

WRENN ID
pale-steel-stoat
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 Ty Mawr, Llangasty Tal-Y-Llyn, Llangors, Powys, LD3 7PJ
OS grid reference
SO 124 260
Coordinates
51.92582, -3.27515
Source
Cadw listing

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

Description

The barn at Ty Mawr is a large structure measuring nine bays long and three bays wide, built from stone rubble with a corrugated roof that is hipped to the right. It features a pitching door on the left side and two tiers of well-made ventilation slits with timber lintels, along with two pairs of opposing doors.

Inside, the barn has pegged trusses that include collar and tie beams, along with three rows of trenched purlins, and some re-used beams. Instead of a wallplate, there are timber pads supporting the trusses. The bay on the right connects to the roof of the farmhouse range. The floor on the right side is at two different levels, and the threshing floor between the doors is made of stone slabs. The area in between is earth, while the extreme left end features stone setts.

Local climate

Barn at Ty Mawr 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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  • No EPC on record for this property
  • No sale records on file
  • 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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