Barn at Ty Mawr is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 21 August 1998. Barn.

Barn at Ty Mawr

WRENN ID
swift-transept-lark
Grade
II
Local Planning Authority
Powys
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, Llan-Y-Wern, Llangors
OS grid reference
SO 101 287
Coordinates
51.94953, -3.30944
Source
Cadw listing

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

Description

The barn at Ty Mawr is a large 7-bay structure built of stone rubble, topped with a Welsh slate roof that extends as a hood over a large double doorway. The barn is oriented northwest to southeast and features one row of ventilation slits on the side and three on the gable end. The right end of the barn has a battered appearance, while the left end includes loft and door openings at a higher level, reflecting the higher ground level. There is a separately listed cartshed range to the north, and a long byre range to the south that is now derelict.

Inside, the barn contains a flagged threshing floor and simple tie beam trusses, which appear to be a later replacement.

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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  • 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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  1. Cart shed range at Ty Mawr Grade II 24 m
  2. Ty Mawr Farmhouse Grade II 45 m
  3. Granary range at Ty Canol Grade II 76 m
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  5. Church of St Mary Grade II* 94 m
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