Heathrow has signed a memorandum of understanding with Cardiff-based 7 Steel UK concerning potential supply of Welsh-manufactured steel for the airport’s proposed expansion programme.
The agreement, signed on 15 October 2026 at 7 Steel UK’s Cardiff facility, creates a basis for further commercial discussions. It is not a confirmed purchase order and does not commit Heathrow to buying a specified tonnage from the steel manufacturer.
Heathrow estimates that its wider expansion programme could require up to 400,000 tonnes of steel during construction. This is the airport’s assessment of potential project-wide demand, not a committed order to 7 Steel UK or a guaranteed volume for any one manufacturer.
The memorandum builds on an established supplier relationship. According to Heathrow, 7 Steel UK has previously supplied more than 150,000 tonnes of steel for airport projects, including construction of Terminal 5.
The parties intend to work towards a framework agreement and potentially a longer-term supply contract, subject to the progress and requirements of the proposed expansion. Any subsequent purchases would need to be agreed through the relevant commercial and procurement arrangements.
7 Steel UK manufactures steel at its Cardiff facility, using electric arc furnace technology and recycled scrap as part of its production process. Heathrow presents the partnership as support for UK steelmaking and its wider policy of increasing opportunities for domestic suppliers.
The airport signed the UK Steel Charter in 2025, expressing a commitment to consider the use of British steel in major construction programmes. The latest agreement is a company-specific step within that approach, though it does not establish the value or volume of future orders.
Steel is a major material requirement for infrastructure construction, including structures, supporting frameworks and associated engineering works. A large expansion programme can create potential demand across manufacturers, fabricators, transport operators and specialist construction contractors.
Long-term procurement visibility can assist suppliers when considering manufacturing capacity and investment, but such benefits depend on projects securing approvals and contracts being awarded. The memorandum gives 7 Steel UK a place in future discussions without removing those commercial conditions.
Heathrow argues that its expansion would support economic activity beyond London and the South East by creating opportunities for suppliers across the United Kingdom. The airport’s claims about employment, investment and wider growth remain projections associated with its proposed development, rather than completed economic outcomes.
The project itself must also progress through the relevant planning, regulatory and financing processes. The steel partnership does not represent final consent for expansion or confirmation of the construction programme’s eventual scope.
The proposed arrangement may provide an early indication of how Heathrow intends to organise parts of its future supply chain. Its practical significance will depend on whether the parties conclude a binding agreement, what specifications and volumes are ultimately required, and whether the wider airport project proceeds.
For 7 Steel UK, the announcement establishes a potential route into a substantial infrastructure programme. The value of any eventual business will only become measurable when specific contracts, deliveries and associated expenditure are confirmed.
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