Green Hall is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 22 March 1993. Hall.

Green Hall

WRENN ID
white-tin-wax
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
22 March 1993
Type
Hall
Address
Green Hall, Llanfyllin
OS grid reference
SJ 164 190
Coordinates
52.76244, -3.23995
Source
Cadw listing

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

Description

Green Hall is a three-storey building with a three-window main block and a crosswing to the left. It is constructed of red brick, featuring Flemish bond in the main block and English bond in the crosswing, with a slate roof and rectangular red brick chimneys. The entrance front faces roughly south.

The main block has three second-floor windows, which are nine-pane hornless sashes set at the eaves. On the first floor, there are three twelve-pane hornless sashes with deep voussoir lintels made of redder gauged brick. The ground floor features an entrance door to the left, accompanied by an open porch supported by wooden posts and topped with a flat roof and cornice. To the right of the porch, there are two windows that match those on the first floor.

The crosswing is gabled and has a single window on each floor, similar to the main block but with broader proportions and shallower voussoir lintels. The left wing has a section under a monopitch roof; it is two storeys high, with a square upper floor window that has small-pane glazing. The ground floor has modern glazing that respects the original opening, complete with a deep voussoir lintel. At the rear, there are gabled extensions made of brick and grey rubble.

Local climate

Green Hall receives an average of 890 mm of rain a year. This makes it wetter than 66% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 56% of listed buildings.

It experiences an average of 43 freeze-thaw cycles a year, more than 84% of listed buildings. Of these, 24 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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