Lewis House is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 9 May 1988. Residential.

Lewis House

WRENN ID
forbidden-spandrel-ridge
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
9 May 1988
Type
Residential
Address
Lewis House, Penygloddfa, Newtown and Llanllwchaiarn
OS grid reference
SO 107 919
Coordinates
52.51793, -3.31713
Source
Cadw listing

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

Description

Lewis House is a three-storey building with a cellar and a polygonal stuccoed front. It features a plastered plinth and an entrance located on a splayed corner, flanked by one window bay that is concave to the left. The roof is hipped and covered with slate, with a pitch daubed with lead at the ridge and plain eaves. The second floor has shallow eight-pane sash windows, while the first floor has sixteen-pane sash windows with a sill band. There is a blind wall over the corner. The ground floor includes a modern window facing Commercial Street and an unsympathetic modern window facing The Crescent, both with plain reveals and stone sills. Below, there are cellar openings. Stone steps lead up to a Gothick porch, which has raised fielded panels on the sides and architraves. The porch features roll-moulded jambs and a tripartite cusped doorhead with pierced quatrefoils in the spandrels. The roof of the porch is ogee-shaped and sits on a moulded cornice. Inside, the panelled interior includes trefoils and bench seats, although there is a modern door.

Local climate

Lewis House sits in a wetter-than-average part of the UK, with an average of 1,010 mm of rain a year. This makes it wetter than 81% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 73% of listed buildings.

It experiences an average of 47 freeze-thaw cycles a year, more than 88% of listed buildings. Of these, 27 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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