Derwen Deg is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 15 March 1996. House.

Derwen Deg

WRENN ID
north-courtyard-bistre
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
15 March 1996
Type
House
Address
Derwen Deg, Govilon, Llanfoist Fawr, Monmouthshire, NP7 9RG
OS grid reference
SO 265 136
Coordinates
51.81666, -3.06684
Source
Cadw listing

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

Description

Derwen Deg is a 2-storey house built in the 19th century, featuring a symmetrical three-window front. The exterior is pebbledashed, and it has a slate roof with a gable end chimney on the left side; the chimney on the right side has been removed. The house includes modern skylights. The windows are 16-pane sash types, each adorned with decorative cement keystones and surrounds. A central 4-panelled door, with the upper two panes glazed, is located within a simple open porch supported by cast-iron columns. There is also a single window on the gable end. The property was not accessible during the inspection in August 1995.

Local climate

Derwen Deg sits in a wetter-than-average part of the UK, with an average of 1,040 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 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 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 — 8 transactions since 1998
  • 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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Nearby listed buildings

  1. Barn to S of Derwen Deg Grade II 19 m
  2. Govilon Bridge (Canal Bridge no 98) Grade II 79 m
  3. Chapel Cottages No 3 Grade II 116 m
  4. Chapel Cottages No 2 Grade II 121 m
  5. Chapel Cottages No 1 Grade II 127 m
  6. Llanwenarth Baptist Church Grade II* 150 m
  7. Embanked Aqueduct SW of Govilon ( including Wall & Gate-piers to W ) Grade II 180 m
  8. Canal Drain to W of embanked Aqueduct Grade II 194 m
  9. Dry Dock to W of embanked Aqueduct Grade II 203 m
  10. Govilon House Grade II 219 m