IN Brief:
- The Court of Appeal refused permission to challenge the runway development consent order.
- The £2.2bn programme covers runway, taxiway, terminal, stand, highway, utility, and drainage work.
- Construction could be completed and the northern runway operational around the turn of the decade.
London Gatwick has cleared a further legal hurdle for its £2.2bn northern runway programme after the Court of Appeal refused permission to challenge the project’s development consent order.
The decision was handed down on 4 August following applications by Peter Barclay and Communities Against Gatwick Noise Emissions. Both sought to appeal the High Court’s June judgment upholding the Secretary of State for Transport’s decision to approve the scheme.
Permission was refused on every ground advanced. The court rejected arguments concerning the Airports National Policy Statement, the assessment of economic benefits, greenhouse gas emissions, non-CO2 effects, the Jet Zero Strategy, and wastewater-treatment requirements.
The ruling leaves the development consent order in force. It authorises improvements to the northern runway and removal of restrictions preventing routine dual-runway operation, together with a substantial package of airfield, terminal, surface access, utility, and environmental works.
The principal engineering intervention involves moving the northern runway’s centreline 12 metres north. That change is intended to create the separation required for routine departures from the northern runway while the existing main runway continues to handle arrivals.
The wider programme includes taxiway reconfiguration, new and altered aircraft stands, pier modifications, terminal extensions, hotels, offices, car parking changes, highway improvements, drainage, power, utilities, and landscape and ecological mitigation. Gatwick says the privately financed scheme could be completed and ready for operational use around the turn of the decade.
The consent process began long before the latest hearing. Gatwick submitted its development consent application in July 2023, the scheme was examined under the Planning Act 2008, and the Secretary of State made the order on 21 September 2025.
The legal challenges were brought under section 118 of the Act. The High Court dismissed them on 23 June 2026, after which the claimants sought permission to appeal; those applications were heard on 27 and 28 July.
One challenge concerned the treatment of national economic benefits and the contribution attributed to business passengers. The Court of Appeal concluded that the Secretary of State had not relied on the disputed National Economic Impact Assessment when reaching her decision, so the argument disclosed no appealable error.
Several grounds concerned climate policy. The court rejected the contention that identifying a moderate significant adverse greenhouse gas effect was legally inconsistent with concluding that the project would not materially prevent the Government from meeting its net-zero target.
It also accepted that a qualitative assessment of non-CO2 greenhouse gases was lawful because no settled methodology or benchmark required a quantitative appraisal. Arguments concerning risks to the Jet Zero Strategy were refused after the court found that revised modelling and policy-monitoring material had been considered.
The final ground concerned wastewater treatment arising from increased airport activity. The Court of Appeal upheld the High Court’s conclusion that the relevant development consent requirement was lawful, removing another proposed route to reopen the approval.
The decision reduces a major element of legal uncertainty without resolving the practical demands of construction. Airport work must be phased around live airfield operations, security restrictions, passenger movements, airline schedules, and tightly controlled access to operational areas.
Gatwick already operates a wider capital investment programme covering upgrades across the airport. The northern runway adds an unusually complex sequence of civil engineering, pavement, terminal, building services, road, drainage, and utility packages that must function as one system while existing operations continue.
The airport says the scheme would provide capacity to serve up to 80 million passengers annually in the longer term and inject £1bn into the economy each year. Those projections remain contested by environmental and community groups, and the consent carries requirements governing noise, surface access, emissions, wastewater, and mitigation.
Compliance with those obligations will continue through design, construction, commissioning, and operation. Gatwick must also discharge requirements, complete detailed design, procure packages, coordinate statutory bodies, and demonstrate that work can proceed safely beside an international airport serving live traffic.
The programme’s interfaces will be especially unforgiving. Runway and taxiway possession periods, utility diversions, stand availability, terminal works, and highway changes must be coordinated so that progress in one package does not displace disruption into another part of the airport.
The Court of Appeal decision settles the current permission applications; it does not turn the consent into a finished programme. After years of planning, examination, and litigation, the next risks are more familiar to construction teams — interfaces, access, sequencing, cost, and the inconvenience of keeping the airport open throughout.
