IIBatslays 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.
IILodge to Dimlands About 1200m south-west of the Church of St. Illtud on the road to St. Donats.
IILower House About 500m south of the Church of St. Illtud approached off Colhugh Street.
IIMalta House About 300m south of the town centre just off the road to the beach.
IIMid Well at West-End Town On the west side of the town in between Bakers Lane and Dimlands Road and about 250m north-west of the Church of St Illtud.
II*Residential Parlour Block and Extension, Old Place On a raised site overlooking Castle Street on the northern edge of Llantwit Major. The parlour block and extension form the right hand end of the mansion.
IIRewley Court About 300m north of the Church of St. Illtud.
IIRosedew About 450m south of the Town Hall on the road to the beach and joined to the south end of Old Rosedew House.
IISummerhouse Fort On the cliffs in the far south-easterly corner of Llantwit Major Community set in the centre of Summerhouse Camp.
IISummerhouse Tower In the centre of Summerhouse Fort on the cliffs in the far south-easterly corner of Llantwit Major Community.
II*The Gatehouse (Porter's Room) About 80m south-west of the Church of St. Illtud. The building is on the roadside and is sited near the south-east corner of the 'Monastery' field.
IIThe Old House About 310m north of the Town Hall at the junction with High Street.
IIWalls surrounding Garden to west of Boverton House Situated in the western angle of Boverton Road and Eglwys Brewis Road. This garden is to the west of Boverton House and is separated from it and its main garden by the road.