Hen house and attached wall at Tynyllwyn is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 19 November 1998. Hen house.

Hen house and attached wall at Tynyllwyn

WRENN ID
moated-stronghold-snow
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
19 November 1998
Type
Hen house
Address
Hen house and attached wall at Tynyllwyn, Partrishow, the Vale of Grwyney, Powys
OS grid reference
SO 280 223
Coordinates
51.89498, -3.04711
Source
Cadw listing

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

Description

This is a small hen house with a pent roof made of stone tiles, featuring an integral lower wall on the west side. The hen house includes a low lintelled doorway on the east side. At the west end of the wall, there is a large orthostat, and there is a 20th-century lean-to structure behind it.

Local climate

Hen house and attached wall at Tynyllwyn receives an average of 940 mm of rain a year. This makes it wetter than 72% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 65% of listed buildings.

It experiences an average of 49 freeze-thaw cycles a year, more than 90% of listed buildings. Of these, 25 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
  • 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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Nearby listed buildings

  1. Barn at Tynyllwyn Grade II 9 m
  2. Stable at Tynyllwyn Grade II 13 m
  3. Cattle ramp, cobbled pavement and revetment at Tynyllwyn Grade II 18 m
  4. Byre at Tynyllwyn Grade II 23 m
  5. Tynyllwyn Grade II* 27 m
  6. Cart Shed and Cider Mill at Tynyllwyn Grade II 36 m
  7. Upper Revetment, Goose Cot and Stairs at Tynyllwyn Grade II 37 m
  8. Lower Revetment including Steps and Bull Cot at Tynyllwyn Grade II 39 m
  9. Pig Sty, Ty Bach and Associated Walls at Tynyllwyn Grade II 47 m
  10. Churchyard cross at Church of St Issui, Partrishow Grade II* 174 m