Campaigners warn the 600-year-old New Barn at Harmondsworth is under potential threat from the proposed expansion of Heathrow. The structure, described as a remarkable example of medieval architecture, is believed to be the largest surviving timber-framed barn in England. Opponents of the plan have raised concerns that increased aircraft movements and associated vibrations could damage the barn’s ancient fabric, and they have until 1 September to register objections to the expansion proposals.
Built around six centuries ago, the New Barn is constructed with historic heavy timbers and joinery that conservation experts consider both rare and fragile. Campaigners have warned that persistent low-frequency vibration can exacerbate existing weaknesses in aged wooden joints and masonry, posing a risk to the barn’s structural integrity. The site’s age and construction mean any physical damage could be difficult to remedy without significant intervention and loss of original material.
The planning process for the airport scheme includes a public consultation period that closes on 1 September; responses submitted during that window will form part of the record considered by decision-makers. Local residents, heritage groups and other stakeholders have used the consultation to document concerns about the barn and surrounding historic landscape. The outcome of the consultation is expected to influence the assessment of environmental and heritage impacts associated with the proposed works.
The dispute over the barn illustrates the broader challenge of reconciling major transport infrastructure projects with the conservation of irreplaceable historic sites. Preservation of timber-framed buildings like the New Barn depends on careful evaluation of risks such as vibration, and on mitigation measures where impacts are identified. The coming weeks will determine whether objections lead to further studies, design changes or protective steps aimed at reducing potential harm to this rare medieval survivor.