Old Dynevor Castle is a Grade I listed building in the Carmarthenshire local planning authority area, Wales. First listed on 8 July 1966. Castle.

Old Dynevor Castle

WRENN ID
rusted-lantern-rush
Grade
I
Local Planning Authority
Carmarthenshire
Constituency
Caerfyrddin MP: Ann Davies (PC)
Country
Wales
Date first listed
8 July 1966
Type
Castle
Address
Old Dynevor Castle, Llandeilo
OS grid reference
SN 611 217
Coordinates
51.87681, -4.01851
Source
Cadw listing

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

Description

Old Dynevor Castle features masonry remains that include an angular curtain wall. This wall has a circular tower at the northwest and a large round tower at the southeast corner, which is now topped by a gazebo from the 17th or 18th century. There are also later additions, including a rectangular hall that faces north.

Local climate

Old Dynevor Castle sits in one of the wettest parts of the UK, with an average of 1,400 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 94% of listed buildings.

It experiences an average of 39 freeze-thaw cycles a year, more than 74% 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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  • 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. Deer Abbatoir in Park to S of Dynevor Castle (Newton House) Grade II 408 m
  2. Dovecote to S of courtyard ranges at Dynevor Castle (Newton House) Grade II 672 m
  3. Dairy Cottage at Dynevor Castle (Newton House) Grade II 731 m
  4. Outer Courtyard Ranges at Dynevor Castle (Newton House) Grade II* 756 m
  5. Inner Courtyard Ranges at Dynevor Castel (Newton House) Grade II* 791 m
  6. Summerhouse at Plas Dinefwr Grade II* 814 m
  7. Fountain in Centre of terraced garden on W side of Plas Dinefwr Grade II 837 m
  8. Plas Dinefwr, including SW Screen wall Grade II* 847 m
  9. Low Stone Walls & Gates to Ha-Ha surrounding Plas Dinefwr Grade II 872 m
  10. East Lodge Grade II 897 m