London, November 28, 2025
The UK government has officially approved Heathrow Airport’s plan to build a longer third runway as part of a £33 billion expansion scheme aimed at increasing airport capacity and boosting economic growth by 2035. The decision appoints Heathrow’s north-west runway proposal as the preferred option for development.
Government Approval and Cost Breakdown
The comprehensive plan entails a £33 billion investment, with £21 billion allocated to the construction of the new runway itself and a further £12 billion devoted to upgrading terminal infrastructure. This major endorsement positions Heathrow Airport Limited to proceed with what the government considers the most feasible and credible expansion option.
Infrastructure Upgrades to Support Expansion
Supporting the new runway requires significant adjustments to existing infrastructure, including a £1.25 billion upgrade of the M25 motorway. These changes are designed to facilitate increased traffic flow and operational efficiency around the expanded airport. Additionally, Heathrow Airport Limited has committed to a separate £15 billion investment focused on modernizing its current facilities, independent of the third runway project.
Project Timeline and Regulatory Landscape
Construction is slated to begin promptly, with the final planning decision expected within the current parliamentary term. Key regulatory bodies, including the Civil Aviation Authority, are anticipated to provide further clarity by mid-December, a critical milestone to prevent delays. The expanded capacity aims to be operational by 2035, aligning with broader transportation and economic development goals.
Strategic Importance for UK Connectivity and Economy
The third runway is designed to maintain Heathrow’s position as the UK’s principal international aviation gateway. Enhanced capacity will improve trade links, passenger experience, and overall connectivity vital for the national economy. The project also meets stringent environmental tests set by the government, reflecting an effort to balance economic expansion with sustainability considerations.
Looking ahead, Heathrow’s expansion represents a significant infrastructure and economic initiative that is expected to provide long-term benefits to the UK’s global connectivity and competitiveness. As regulatory details solidify and construction advances, stakeholders will closely monitor developments to gauge the full impact of this transformative project by 2035.