Great House is a Grade II listed building in the Monmouthshire local planning authority area, Wales. First listed on 22 June 2000. Farmhouse.

Great House

WRENN ID
long-oriel-quill
Grade
II
Local Planning Authority
Monmouthshire
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
22 June 2000
Type
Farmhouse
Address
Great House, Llanllowell/Llanllywel, Usk, Llantrisant Fawr, NP15 1LJ
OS grid reference
ST 392 986
Coordinates
51.68304, -2.87969
Source
Cadw listing

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

Description

Great House is a farmhouse built from rubble stone with a slate roof, featuring red brick end stacks and one ridge stack located just behind the ridge, suggesting that the roof may have been raised at some point. The building has two storeys and an attic, with a three-window front consisting of 19th-century four-pane sash windows and a central six-panel door. There is some remaining render on the right side of the facade.

At the rear, there is a three-window range with a door on the ground floor to the left, along with three-light and two-light ground floor windows that have top lights, one sash window, and two casements above. The front features lower wings on each side; the left wing is made of rubble stone and has two 20th-century small upper windows, as well as a 20th-century twelve-pane window in the end gable. The service wing on the right is partly obscured by an added lofted range that extends at right angles towards the road. This lofted structure was originally a cart-shed or coach-house, with the ground floor comprising three bays open to the yard, one bay infilled, and the other two divided by an iron post, along with two 20th-century windows above. The rear side, which overlooks the house, has two first floor 20th-century small windows and a 20th-century glazed door on the ground floor to the left. There is also a 20th-century twelve-pane window in the gable end facing the road. The service wing includes a door to the right of the projecting range and a first floor 20th-century window in the gable end, both featuring stone voussoirs. There are rear outside steps leading to a loft door.

Fox & Raglan describe the house as having a standard two-room plan with a third room added at an uncertain date. They note the presence of good roof trusses with tenoned collars and a unique stop to a beam chamfer, where the typical stepped hollow stop has a ridge to the hollow. They found no evidence of a stud and panel screen.

Local climate

Great House receives an average of 890 mm of rain a year. This makes it wetter than 66% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 66% of listed buildings.

It experiences an average of 41 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 18 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
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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 range at Great House Grade II 28 m
  2. Church of Saint Llywel Grade II 34 m
  3. Pentwyn Grade II* 483 m
  4. Barn at Pentwyn Grade II 502 m
  5. The Cwm Grade II* 1.4 km
  6. Ty Mawr Grade II 1.6 km
  7. Outbuilding at Ty Mawr Grade II 1.6 km
  8. Llandowlais Farmhouse Grade II 1.7 km
  9. Open-bay shed at Pen-ucha'r-plwyf Grade II 1.7 km
  10. Tribwthin Grade II 1.7 km