Owain Glyndwr Institute is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 19 November 1990. Institution.
Owain Glyndwr Institute
- WRENN ID
- calm-chapel-moss
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 19 November 1990
- Type
- Institution
- Address
- Owain Glyndwr Institute, Machynlleth
- OS grid reference
- SH 748 008
- Coordinates
- 52.59085, -3.84935
- Source
- Cadw listing
Description
The Owain Glyndwr Institute is a 19th-century L-plan building designed in the Tudor revival style. The ground floor is constructed of rubble, while the upper half is partially rendered. It features a slate roof and rubble chimney stacks. The front has three bays, with a broad bracketed gable on the left that includes a pendant, finial, and a dentil band along the bargeboards. A two-storey porch is set forward at the center, showcasing a similar gable design. The eaves overhang, and there is a garlanded rainwater head. The left side has diamond leaded glazing with mullions and transoms, and a cross frame oriel window with a pediment above the segmental arched entrance, which is accessed through a boarded and studded door.
To the left, the building continues with a similar construction, dominated by a three-storey tower located midway along this side. The tower features a swept pyramidal roof topped with a tall weathervane. There is a gable immediately to the right and a double jettied gable to the left, supported by a low cylindrical column. The tower has a pointed arch doorway.
At the far end of the building, there is a tall pointed arch that mirrors the one on the front, situated between the Institute and the Parliament House. A stepped outhouse to the left has an imitation crenellated parapet.
Inside, the dog-leg staircase has a stone handrail that is partly carved. There are some half-timbered walls and a stone fireplace with half round columns on the ground floor.
Local climate
Owain Glyndwr Institute sits in one of the wettest parts of the UK, with an average of 1,280 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 38 freeze-thaw cycles a year, more than 73% of listed buildings. Of these, 20 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.
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- Detailed attributes — period, style, materials, features
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