Garth-fawr is a Grade II* listed building in the Powys local planning authority area, Wales. First listed on 12 October 1978. A C17 House.

Garth-fawr

WRENN ID
watchful-barrel-shade
Grade
II*
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
12 October 1978
Type
House
Address
Garth-fawr, Llangyniew
OS grid reference
SJ 117 131
Coordinates
52.7085, -3.30827
Source
Cadw listing

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

Description

Garth-fawr is an altered timber-framed house dating from the 1½-storey period, originally consisting of two units but now enlarged to three. The building is mostly encased or underbuilt in stone and is oriented north-east/south-west, facing south-east towards a garden. It features a slate roof with a modern brick chimney located to the left of center when viewed from the front, and a rear wing that includes a stone end-chimney.

The front elevation, which faces the garden, is primarily made of white stone. The upper parts of the left and middle bays still display timber framing. There is a modern door and porch at the main entrance, positioned opposite the main chimney. Flanking this entrance are pairs of 12-pane iron casement windows, with a modern timber window in the right bay. The center and right bays each have dormers fitted with modern casements.

The left gable elevation is constructed of uncoursed plain stonework and features small-pane iron casements in the upper storey and in the rear extension, along with a small modern window. The right gable elevation displays timber framing above the tie beam and stonework below, with the framing being brick nogged. There is a small-pane window where a former loft doorway was located.

The irregular rear elevation includes a small catslide lean-to that incorporates a porch, along with a small dormer and one rooflight. The end of the rear wing is finished in plain stonework.

Inside, there is a large inserted chimney with a main hearth serving the middle unit. The middle and north-east units contain two axial main beams, while the south-west unit has a single axial beam with very large chamfers. Notching in the soffit of the beams in the central unit is thought to be related to a former dais end. The gable end of the rear extension features a large hearth with a bread oven to the right and space for a boiler to the left.

Local climate

Garth-fawr receives an average of 950 mm of rain a year. This makes it wetter than 73% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 67% of listed buildings.

It experiences an average of 39 freeze-thaw cycles a year, more than 76% 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.

More on this building

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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 2 transactions since 2019
  • No related consent applications matched
  • 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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