Castell Morgraig is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 28 January 1963. Warehouse.
Castell Morgraig
- WRENN ID
- silver-wall-ash
- Grade
- II
- Local Planning Authority
- Caerphilly
- Constituency
- Caerphilly MP: Chris Evans (Lab)
- Country
- Wales
- Date first listed
- 28 January 1963
- Type
- Warehouse
- Address
- Castell Morgraig, Thornhill
- OS grid reference
- ST 159 843
- Coordinates
- 51.55183, -3.21299
- Source
- Cadw listing
Description
Castell Morgraig is a historic irregular pentagonal curtain wall castle, featuring towers at four corners and a keep at the fifth corner. The western entrance is original, while a later access point has been cut through to the east. The thick walls are made of roughly coursed conglomerate stone and stand between 1 and 3 meters high, with dressings believed to be of Sutton stone. The keep, located opposite the western entrance and next to the later eastern entrance, is square and larger than the towers, although much of the eastern wall is missing. The massive towers have rounded ends and splayed side walls, with some remains of doorways leading into them from the courtyard still visible. The southern towers include circular basements, which served as retaining structures to support the castle on a steep scarp. There are low, indistinct earthworks in the courtyard, and it is said that a stone base for a timber staircase once existed against the western curtain wall, leading to the upper floor. The stone used for the castle's construction was quarried on-site, resulting in distinctive earthworks along the scarp of the hill.
Local climate
Castell Morgraig sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 81% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 59% of listed buildings. Of these, 13 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
- No sale records on file
- 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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