History in Structure

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Summerhouse Fort

A Grade II Listed Building in Llantwit Major, Vale of Glamorgan

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Latitude: 51.3885 / 51°23'18"N

Longitude: -3.447 / 3°26'49"W

OS Eastings: 299413

OS Northings: 166486

OS Grid: SS994664

Mapcode National: GBR HK.RRPX

Mapcode Global: VH6FN.6CLF

Entry Name: Summerhouse Fort

Listing Date: 16 December 2004

Last Amended: 16 December 2004

Grade: II

Source: Cadw

Source ID: 83401

Building Class: Miscellaneous

Location: On the cliffs in the far south-easterly corner of Llantwit Major Community set in the centre of Summerhouse Camp.

County: Vale of Glamorgan

Town: Bridgend

Community: Llantwit Major (Llanilltud Fawr)

Community: Llantwit Major

Locality: Boverton

Traditional County: Glamorgan

Find accommodation in
Saint Athan


Part of a picturesque concept of a toy fort to be used as a summerhouse, look-out and picnic place on the top of the cliffs. It is built in the middle of the Iron Age cliff castle of Summerhouse Camp and dates probably from the period of 1780-1820 when such conceits were popular. During WWII it was apparently used as a site for a defensive point of some kind. The early history of the fort is unknown.


Built of local limestone rubble in the form of a octagonal curtain wall about 2m in height, with corner towers at least one of which on the north side seems to have been a privy. The finished design of both walls and towers is uncertain since they are both damaged and much covered in ivy but there appear to be small battlements in the form of a cock-and-hen parapet in parts. On the east side a small barn-like building is incorporated into the curtain. This is unroofed and featureless apart from a doorway but it has a WWII gun-loop on the north corner.

Reasons for Listing

Included for its special interest as a picturesque folly dating from about 1800.

Other nearby listed buildings

  • II Summerhouse Tower
    In the centre of Summerhouse Fort on the cliffs in the far south-easterly corner of Llantwit Major Community.
  • II Batslays Farmhouse
    On the eastern boundary of Llantwit Major Community but approached going west from St Athan village centre to the south of RAF St Athan.
  • II West Farmhouse
    At the far west end of Higher End by the south-east corner of RAF St Athan.

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