Defynnog House/ Ty Defynnog is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 28 October 2005. House.

Defynnog House/ Ty Defynnog

WRENN ID
cold-banister-merlin
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
28 October 2005
Type
House
Address
Defynnog House/ Ty Defynnog, Maescar, Powys
OS grid reference
SN 925 278
Coordinates
51.93889, -3.56463
Source
Cadw listing

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

Description

Defynnog House, also known as Ty Defynnog, is a house constructed from whitewashed rubble stone, featuring an imitation slate roof and a stone stack at the south end. The building is two storeys high and has a three-window range that includes 19th-century horned four-pane sash windows with slate sills. The central entrance consists of a six-panel door with fielded panels and a three-pane overlight above. A hipped door hood, also in imitation slate, covers the entrance. There are thin string courses above the first-floor windows and beneath the eaves, and the ground floor windows have cambered heads. The north end wall has no openings. The rear of the house has 20th-century windows and is roughcast, extending to three storeys and an attic. There is a whitewashed rubble wing at a right angle to the main house, which has a brick end stack, garage doors leading to the basement, and a door and window positioned above. The interior has not been inspected.

Local climate

Defynnog House/ Ty Defynnog sits in one of the wettest parts of the UK, with an average of 1,410 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 55 freeze-thaw cycles a year, more than 95% of listed buildings. Of these, 31 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 — 5 transactions since 2010
  • 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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