Heir's House was a post-medieval farmstead. The earliest reference to it is in a document of 1618 when it was called Harehouse. The farmstead also appears in the Elsdon Parish Register for the 17th and 18th centuries and is on 18th and 19th century maps. The farm seems to have been dismantled in the late 19th century as it is not on the 1898 Ordnance Survey map.