Perthi farmstead was located approximately one mile west of Hundred House, Builth Wells, 'to the south-east of the craggy unimproved upland of Perthi Common.' Ther is a building named 'Porthee' recorded on the 1729 Map of South Wales by Emanuel Bowen. 'The building is not shown in any great detail owing to the scale of the map, but given its location it can be assumed this refers to the Perthi farmstead.'
'Four buildings are marked here on the 1817 one inch Ordnance Survey map and these are shown in more detail on the Tithe map of 1841, all of which lie on a roughly north-west-south-east alignment. The largest of the buildings at the centre of the farmstead is L-shaped in plan and is presumably the original farmhouse with attached outbuildings. A rectangular building lies to the north-east of this and two further rectangular buildings lie to the south-west. The Tithe Apportionment records the land was then owned by Thomas Woozencroft and occupied by John Woozencroft. The plot is recorded as a `homestead? surrounded by pasture fields, with an orchard in the field immediately to the east.'
'The 1st edition 25? Ordnance Survey map of 1889 (Fig. 3) depicts the same four buildings, although the rectangular building to the north-east appears to have been enlarged to form a square building. By 1889, the 2nd edition 25? Ordnance Survey map suggests the two western buildings had gone out of use.'

Source: Clwyd Powys Archaeological Trust Report no. 1615, prepared by Will Logan and Sophie Watson in November 2018.
RCHAMW, 13th February 2020