The Great Oak is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 10 April 1989. Townhouse.

The Great Oak

WRENN ID
stony-belfry-acorn
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
10 April 1989
Type
Townhouse
Address
The Great Oak, 12 Great Oak Street, Llanidloes, SY18 6BU
OS grid reference
SN 955 844
Coordinates
52.44826, -3.53853
Source
Cadw listing

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

Description

The Great Oak is a group of three-storey buildings featuring scribed rendered fronts with plinths. They have a slate roof, red brick chimney stacks, and boarded eaves, along with cill bands on the first and second floors. Nos 9 and 10 are a reflected pair with one window each, while Nos 11 and 12 have two windows each. The windows at Nos 9 and 12 are nine-pane sash windows, mostly horned, with keystones on the first and ground floors; some windows have been replaced. Nos 9 and 11 have half-glazed doors, while No 10 features a four-panel door with 'imported' architrave.

No 11 has a shop front with a two-light window, a panelled stallriser, and a half-splayed entrance. No 12 has a full-width shop front with a central double door entrance flanked by segmental-headed panes, with a single pane to the left and twin panes to the right, also featuring a panelled stallriser. In the center of the building, between Nos 10 and 11, there is a round-arched entry leading to a tunnel passage with boarded doors, a brick wall on the left, and rubble on the right.

The rear of No 9 is rendered and has three-pane modern windows. The largely whitewashed rubble rear of Nos 10 and 11 projects further, with small-pane metal frame casements on No 10 (some glazing bars removed on the ground floor) and modern casement windows on No 11. No 12 has a whitewashed rubble cross range with brick dressings, which is splayed and recessed at the angle, featuring similar windows to No 10 at the top.

Local climate

The Great Oak sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.

It experiences an average of 53 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 32 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
  • 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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