Barn at Greenmeadow Farm is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 18 July 2001. Barn.

Barn at Greenmeadow Farm

WRENN ID
other-mullion-onyx
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
18 July 2001
Type
Barn
Address
Barn at Greenmeadow Farm, Mamhilad, Pontypool, Goetre Fawr, Monmouthshire
OS grid reference
SO 300 043
Coordinates
51.7336, -3.01482
Source
Cadw listing

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

Description

The barn at Greenmeadow Farm is a large threshing barn built from local purple random sandstone rubble and topped with a Welsh slate roof. The south side of the barn is obscured by trees, but it features slit vents arranged in two tiers on either side of the cart doors, which have been replaced with corrugated steel sheeting. Above the doors, there is a small plaque inscribed with "WWM 1761." On the yard side, there are four slit vents to the left of the cart doors and two vents above the cowhouse door on the right. Slit vents are also present in the gable ends.

Inside, the barn has a five-bay roof supported by four triangular trusses that include ashlar pieces, along with three tiers of purlins, a ridge piece, and secondary rafters, all of which are intact. The timber hayloft floor is also complete, along with the cowhouse located below.

Local climate

Barn at Greenmeadow Farm receives an average of 940 mm of rain a year. This makes it wetter than 73% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 72% of listed buildings.

It experiences an average of 41 freeze-thaw cycles a year, more than 79% of listed buildings. Of these, 19 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
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  • 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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  9. West wall to churchyard of Church of St Illtyd with stile, gatepiers and postbox Grade II 1.1 km
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