High Court backs Gatwick expansion after climate challenge fails

Climate objections were unable to stop Gatwick Airport’s expansion once ministers had signed off the project, with the High Court dismissing two challenges to the £2.2bn northern runway plan on 23 June 2026. The ruling left the government’s development consent in place and cleared a major legal hurdle for a scheme that would turn Gatwick into a dual-runway airport.

Mr Justice Mould rejected the cases brought by Communities Against Gatwick Noise Emissions, known as CAGNE, and Peter Barclay of the Gatwick Area Conservation Campaign. The Department for Transport and Gatwick Airport Limited opposed the judicial review. Gatwick called the ruling a “victory for common sense”.

The decision matters in practical terms because it preserves the approval granted by Transport Secretary Heidi Alexander in September 2025 for a privately financed scheme worth £2.2bn. The project would move Gatwick’s emergency runway 12 metres north, allowing the airport to use its northern runway routinely and handle up to 80 million passengers a year. The government had already granted development consent on 21 September 2025, after Alexander issued a “minded to approve” letter in February.

For campaigners, the judgment narrows the path forward. Their immediate option is an appeal, which they said they would consider, but the High Court ruling means the core planning approval remains intact for now. The Planning Inspectorate also issued a correction notice and correction order on 20 January 2026, a reminder that the consent order has already been through further administrative scrutiny.

If the decision is not overturned, construction is expected to proceed in phases, with main airfield works lasting five years. That timeline gives a sense of how long the airport would be tied up in engineering even after the legal fight has been settled, and how much of the project’s impact would be spread across the rest of the decade.

The ruling also carries wider weight for Britain’s airport and net-zero politics. Gatwick and its supporters say the project is one of the biggest growth opportunities in the UK, while critics warn that more flights will mean more noise, traffic and emissions in a region already shaped by aviation. Local authorities including Sevenoaks District Council and East Sussex County Council have already raised concerns, underlining how the dispute has stretched well beyond West Sussex and into the broader argument over how far climate commitments can still restrain infrastructure once ministers have approved it.