Bryn Erfyl and Tynllan is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 20 March 1996. Houses.

Bryn Erfyl and Tynllan

WRENN ID
scarred-landing-heath
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
20 March 1996
Type
Houses
Address
Bryn Erfyl and Tynllan, Llanerfyl
OS grid reference
SJ 033 097
Coordinates
52.67682, -3.43077
Source
Cadw listing

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

Description

Bryn Erfyl and Tynllan are two houses, each with a two-unit plan and two storeys, featuring four chimney stacks, one at or near the end of each house.

Bryn Erfyl has a symmetrical layout with a central doorway. It is topped with a slate roof and has brick gable end chimney stacks. The exterior is made of random rubble masonry in large blocks, with the gable end rendered in rough cast and painted white. The upper storey features timber windows beneath the eaves, including two casement windows with 16 panes and a central narrow window with 8 panes. The ground floor has two tripartite cast iron windows, each section containing 8 panes, set under segmental brick arches that are two bricks thick, with chamfered brick sills. There is a modern front door and porch. At the rear, the eaves are lower than at the front, and there is a small extension. The upper storey has three dormers, all with sash windows.

Tynllan is constructed of random rubble masonry, using smaller and paler stones than Bryn Erfyl. It appears to have been built against Bryn Erfyl but shows evidence of many changes in its structure. The upper storey has three wooden casement windows with 16 panes beneath the eaves, though there may have once been four windows. The ground floor features three wooden casement or fixed light windows under segmental brick arches that are one brick thick, with the leftmost window having 12 lights. It has plain stone sills and a wooden, panelled half-lit door under a segmental brick arch, located immediately below the second window from the left, resulting in a non-symmetrical layout. The rear of Tynllan is similar to the front but includes a small lean-to, and there is an additional range extending from the north gable, likely a later addition, which contains long, horizontal windows with small panes.

Local climate

Bryn Erfyl and Tynllan sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 42 freeze-thaw cycles a year, more than 80% of listed buildings. Of these, 22 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 — 3 transactions since 2000
  • 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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