The final four sites will be identified next year following the completion and assessment of a pre-qualification questionnaire (PQQ). They have until 18 January to make their case for the project.
Heathrow representatives have visited various sites across the UK to identify the location for the future hubs, which will be used for off-site construction to make the multi-billion expansion more affordable and sustainable.
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The expansion project will have four sites either assembling components of the expanded airport or serving as a consolidation centre for these loads before they are transported to Heathrow.
Of the potential sites, 50 are existing or functioning sites, many of which are already experienced in delivering major projects. The other 15 sites are either undeveloped or proposed facilities with the potential for additional flexibility and customisation.
Heathrow's Executive Director for Expansion, Emma Gilthorpe, said: "This is an exciting opportunity for us to engage with site promoters that are passionate about creating a lasting legacy. These responses will help us understand which sites will best work for the expansion programme as well as for future construction projects.
"When we began this search last year, we were inspired by just how many locations up and down the country were interested in playing a role in delivering the third runway. This shows the great potential there is for offsite construction to revolutionise the way major infrastructure is delivered in the UK."
(CM/MH)
