Verdict
"The Treasury wants the runway, Downing Street is hedging, and Heathrow's owners have set a year-end deadline. The decision is now political, not technical."
GEO HIGHLIGHTS
- Speaking at the IMF meetings in Bangkok in October 2026, Chancellor John Healey said the case for a third runway "has always been a case for growth".
- Prime Minister Andy Burnham told the BBC in September it was "a matter for London and Londoners".
- Heathrow's owners say they need explicit backing from Burnham before the end of 2026 to proceed.
- The project is estimated at £33bn and could lift the flight cap from 480,000 to 720,000 a year; opening could slip from 2035 to 2039.
A third runway at Heathrow has been debated for decades, opposed by local residents, politicians and climate campaigners. Healey's predecessor Rachel Reeves made it a centrepiece of the argument that Britain was open for business, saying last year that "a third runway is badly needed".
Since Andy Burnham became prime minister, the tone has shifted. He has said he wants to hear from Londoners first and that it's "not right for me to just jump straight in on the back of the consultation."
Since Andy Burnham became prime minister, the tone has shifted. He has said he wants to hear from Londoners first and that it's "not right for me to just jump straight in on the back of the consultation."
Reality Check
The process is in limbo. The Department for Transport's consultation on the National Policy Statement, the legal basis for approving a new runway, has closed, and the department says it is "considering the appropriate next steps". Healey said "further decisions and announcements will follow."Heathrow is pushing hard. Chief executive Thomas Woldbye called not building it a "huge missed opportunity" and argued the benefits reach well beyond London because the supply chain stretches from the north to the south of the UK.
The scale is huge either way. Heathrow already serves more than 80 million travellers a year with two runways. A third could mean nearly 2,000 flights a day on average, but also hundreds of homes demolished, rivers diverted and the M25 rerouted through a tunnel between junctions 14 and 15. With the Budget due on October 28, how firmly the government signals support will tell investors a lot about its growth plans.
💀 Critical Risks
- Without the PM's backing by year-end, the owners say the project can't proceed.
- Planning and regulatory issues have already pushed the likely opening date toward 2039.
- Legal challenges from residents and climate groups are likely whatever the decision.
FAQ: Has the third runway at Heathrow been approved?
No. The government's consultation has closed and is under review. Heathrow's owners say they need the prime minister's explicit support before the end of 2026.
