John Johnston was leasing this property from the Conyngham estate at the time of Griffiths Valuation in the 1850s, whe it was valued at £20, with an adjacent mill valued at £14. The current house appears to have been built after the publication of the 1st edition Ordnance Survey map in the 1830s. The National Inventory of Architectural heritage provides a detailed chronology of its occupation by the Johnston family.
Rockfield House (National Inventory of Architectural Heritage, https://www.buildingsofireland.ie/)
