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

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

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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