Glantwymyn is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 31 January 1997. House.

Glantwymyn

WRENN ID
dusk-merlon-heath
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
31 January 1997
Type
House
Address
Glantwymyn, Bont Dolgadfan, Llanbrynmair
OS grid reference
SH 886 001
Coordinates
52.588, -3.64503
Source
Cadw listing

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

Description

Glantwymyn is a building dating from around 1820 to 1830, constructed of rubble stone with a slate roof. It is two storeys high and consists of a single subdivided room on each floor. A boarded door leads to a lobby at the side of the gable stack. The building features four-paned timber cross windows, with the upper windows gabled above the eaves. In front of the door, there is Montgomeryshire pebble paving.

Inside, the main living room is partitioned to create a service room and a stair at the rear, which rises to a landing and a single chamber on the upper floor.

Local climate

Glantwymyn sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 47 freeze-thaw cycles a year, more than 89% 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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  • No EPC on record for this property
  • Sale history — 2 transactions since 2023
  • 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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