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Business
Jun 22, 2026
Analyzed by Llama- 4 Scout 17B 16E Instruct

Heathrow Third Runway GDP Yield May Be 90% Less Than Previous Estimates

AI Summary
The UK government's analysis shows that the economic boost from a Heathrow third runway could be a tiny fraction of previous estimates, with a GDP yield of only up to 0.05%, 90% less than the 0.5% previously stated. The overall trade-off from the bigger airport could set the UK back by as much as £62.5bn.

The Lead

The economic boost from a Heathrow third runway could be a tiny fraction of previous estimates, government analysis shows, while the overall trade-off from the bigger airport could set the UK back by as much as £62.5bn.

Heathrow's Economic Impact Reevaluated

As ministers promised to speed up expansion of the London airport in the name of economic growth, documents prepared by the Department for Transport said the runway was expected to boost GDP by only up to 0.05% – 90% less than the 0.5% previously stated.

The Data Analysis

The Department for Transport calculates the net present value of the scheme, even if entirely privately financed, to be between £23.4bn and £62.5bn. Net present value is defined by the DFT as the overall social value of expanding Heathrow, compared with not doing it, adding all costs and benefits.

  • Positive benefits to passengers: £29bn and £42.4bn
  • Profits at airlines and other airports expected to fall: £25bn

The Impact Analysis

The documents state that “external analysis, commissioned by the DFT, has found that the scheme could add up to 0.05% to GDP in 2056”. Figures previously cited by the government have been in the range of 0.43%-0.5% growth.

The Prediction

The Heathrow expansion is estimated to cost £33bn, although a recent independent assessment for the Civil Aviation Authority said the project was likely to cost between £32.7bn and £52.4bn. The scheme is expected to divert the M25 motorway and demolish about 800 homes, to add about 276,000 extra flights a year.