Headstone Manor is a Grade I listed building on a moated site in north-west London. At the core of the building is part of an early 14th-century timber framed house, the only surviving example of a medieval aisled hall in Middlesex. The London Borough of Harrow owns the building, and
has plans to repair both the Manor House itself and to develop the medieval parts for use as a museum. The fabric of the structure has now been analysed, and dendrochronology has revealed that the hall range and surviving cross wing were built during a single phase of construction, c 1320; some 30 years earlier than had previously been thought. The survey also confirms the hypothesis that the house originally had an overshot cross passage situated within the cross wing.
