Site Record

Great Hermaston lies about a mile to the south-west of Johnston, to the east of the A4076 Milford Haven road. Although little documentation remains relating to the early history of the house, it is known that the property was called Hermaston in the sixteenth-century and that Thomas Jones of Hermaston was sheriff in 1589.
The house is a two-storeyed, limewashed rubble-built, six-bay structure with slate roof and bracketed eaves. The windows are mostly sashed, many retaining the original ovolo-moulded glazing bars. The door is a little off-set to the south, and there was originally a gabled porch. The interior has a considerable quantity of early eighteenth-century panelling and an early-eighteenth century staircase. There is a rubble lean-to the south and further additions to the rear (west) of the house. The rear (south) elevation appears to be in at least two phases. The present structure probably belongs to the early eighteenth-century, with later additions in the middle of that century and further later additions. It is believed that the house is on or near the site of an earlier house.
The outbuildings are to the west of the house and form an L-shaped range (NPRN 22574). The store, cart-shed and barn range runs east-west and the main front faces north. To the east of this main building is a secondary, lean-to garage with brick quoins and stone walls. The store and cart-shed is a lower building than the barn to which it is attached; together they form a unit of some 30m in length.
The amount of reused masonry in the outbuildings suggests that there was a building of some quality on or near the site in the early seventeenth century; an earlier house may have been heavily altered in the eighteenth century when the outbuildings were added.
Gardens lie to the south of the property (402124).
Sources:
Cadw 2007: Register of Parks and Gardens of Special Historic Interest, additional and revised entries part 1, ref: PGW9Dy)19(PEM).
Additional notes: NMRW site files PE/Domestic/SM90NW (A.J. Parkinson)

RCAHMW, 11 October 2017