Porth-gwibedyn is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 26 November 1996. House.

Porth-gwibedyn

WRENN ID
brooding-soffit-merlin
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
26 November 1996
Type
House
Address
Porth-gwibedyn, Penstrowed, Llandinam
OS grid reference
SO 046 909
Coordinates
52.50846, -3.40625
Source
Cadw listing

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

Description

Porth-gwibedyn is a two-storey building featuring Tyrolean-rendered brickwork and a slate roof. The main entrance is a boarded door located within a small open porch, which leads into the former open hall. The building has uPVC windows.

Inside, the central hall has been significantly altered due to the introduction of a stack. It is defined by cruck trusses, with the upper truss being obscured by the stack. This upper truss includes arch braces and cusped raking struts above the collar, as well as a yoke apex that is notched to support the ridge. A post and panel partition with door openings at each end separates the hall from the inner room(s) at the south end, which is raised in level and also features a cruck truss. The hall itself has twin chamfered spine beams and a fire lintel, although the cheeks of the fireplace have been rebuilt. The parlour, located behind the stack, has joists that display decorative longitudinal scribed grooves. The rear wing of the building contains a dog leg stair and previously housed a bake oven and a well.

Local climate

Porth-gwibedyn sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 90% of listed buildings. Of these, 28 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
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