Heathrow Expansion Raises Risk Concerns for 600-Year-Old Harmondsworth Barn
Heritage specialists warn that aircraft vibrations from a proposed third Heathrow runway could damage the 600-year-old Great Barn at Harmondsworth as a government consultation approaches its September 1 deadline.
In short
- Heritage specialists warn that aircraft vibrations from a proposed third Heathrow runway could damage the 600-year-old Great Barn at Harmondsworth as a government consultation approaches its September 1 deadline.
A proposed third runway at Heathrow Airport has prompted fresh concern over the future of the Great Barn at Harmondsworth, a 600-year-old timber-framed building located a few hundred metres from the planned expanded airport boundary.
Campaigners and heritage specialists say aircraft vibrations associated with a larger airport could damage the Grade I-listed barn, whose medieval structural timbers remain more than 95 percent original. Built in 1426, the structure is nearly 60 metres long, 12 metres wide and 11 metres high, with 13 large oak roof trusses.
The warning comes as the British government consults on amendments to the national policy statement governing Heathrow expansion. The public consultation is due to close on September 1, 2026. Heathrow is expected to hold a separate consultation later in the year.
Justine Bayley, a former archaeological scientist with English Heritage who chairs the Stop Heathrow Expansion campaign, said vibration levels should be measured as part of the assessment. Residents in nearby Longford, one of the communities that would be affected by the runway proposal, have also reported feeling vibrations from aircraft departures.
Heathrow said the barn lies outside the proposed new airport boundary and that the development-consent process would examine potential effects and any measures needed to limit them. Britain’s Department for Transport said possible impacts on heritage sites, neighbouring communities and the environment would be considered before final decisions are made.
English Heritage bought the barn in 2011. The organisation and the Friends of the Great Barn at Harmondsworth are scheduled to hold a conference at the site on September 5, 2026, focused on its construction and recent archaeological research.
The dispute adds heritage preservation to the economic, environmental and community questions surrounding the long-running Heathrow expansion proposal. No final decision on the runway has been announced through the consultation described in the source.
