Glynhir Barn is a Grade II listed building in the Carmarthenshire local planning authority area, Wales. First listed on 27 August 1999. Barn.
Glynhir Barn
- WRENN ID
- steep-truss-crag
- Grade
- II
- Local Planning Authority
- Carmarthenshire
- Constituency
- Caerfyrddin MP: Ann Davies (PC)
- Country
- Wales
- Date first listed
- 27 August 1999
- Type
- Barn
- Address
- Glynhir Barn, Ammanford, Llandybie
- OS grid reference
- SN 639 151
- Coordinates
- 51.81828, -3.9749
- Source
- Cadw listing
Description
Glynhir Barn is a notable double threshing barn constructed from local sandstone rubble, featuring carefully selected thin stones for the segmental arches of its four large doorways. The lower meter of the walls is slightly battered, and the roof is made of local sandstone, topped with 19th-century red ridge tiles that include a small finial at the south end. On the north side, there is a catslide extension built with similar materials. Each gable end has two tall slit ventilators, while each long wall contains four. High-level hatch openings at both ends of the long walls are adorned with cambered arches.
The barn consists of nine bays supported by collar and tie beam trusses. There is an inserted floor at the north end, which includes shafting from former machinery, along with marks indicating lost inserted floors in the center and at the south end. The flooring features stone paving in the heads and center, with stone pitching in the threshing bays.
Local climate
Glynhir Barn sits in one of the wettest parts of the UK, with an average of 1,430 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.
It experiences an average of 30 freeze-thaw cycles a year, fewer than 63% of listed buildings. Of these, 13 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
- No related consent applications matched
- 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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