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

London House

WRENN ID
little-spire-scarlet
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
22 March 1993
Type
Commercial building
Address
London House, Llanfyllin
OS grid reference
SJ 141 194
Coordinates
52.76618, -3.27364
Source
Cadw listing

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

Description

London House is a three-storey building located on High Street, featuring a rendered elevation divided into two bays that are highlighted by Ionic pilasters. The top floor has two windows with twelve-pane hornless sash glazing, while the first floor has two windows with sixteen-pane hornless sash glazing. On the ground floor, there are two mid-19th century shopfronts. The shopfront on the left has an advanced doorway with a dentil cornice above and a shop window to its right. The shopfront on the right is double-fronted, featuring a central doorway between two shop windows, with classically-derived shallow pilasters and a fascia that has a bracketed cornice.

The premises extend along Narrow Street and incorporate former separate shops. The left section has a painted brick façade with a window on each floor. To the right of this, there is a rubble-fronted section with a square window on the second floor, a camber-headed window with a small-pane Yorkshire sash on the first floor, and fixed small-pane glazing in the camber-headed window on the ground floor. Further to the right, there is a two-bay painted brick fronted section that has a camber-headed window on the top floor, a square-headed first floor window with small-pane horned sash glazing, and an off-set camber-headed doorway with a broad window to its right. This section also features tall loading bay doors on the top and first floors, with a camber-headed entrance doorway beneath.

Local climate

London House sits in a wetter-than-average part of the UK, with an average of 960 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 61% of listed buildings.

It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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
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  • 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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