The government has opened a public consultation on the draft Heathrow Expansion National Policy Statement, moving the third runway programme into its next formal policy stage and setting the planning framework against which any future development consent application would be tested.
For construction, the important point is that this is not planning permission. It is the document that would shape the rules of the fight: runway capacity, terminal reconfiguration, surface access, strategic road changes, environmental mitigation, community compensation and the sensitive relocation of Home Office assets linked to Heathrow expansion.
A Policy Step, Not A Green Light
The Department for Transport has launched consultation on proposed amendments to the 2018 Airports National Policy Statement. The revised document would be renamed the Heathrow Expansion National Policy Statement, or HENPS, to make clear that it applies specifically to expansion at Heathrow through a Northwest Runway scheme.
The consultation closes at 11:59pm on 1 September 2026. After consultation and parliamentary scrutiny, any final amended National Policy Statement would need to be published, laid before Parliament and approved before it has legal effect. Until then, the 2018 Airports National Policy Statement continues to have effect.
London Construction Magazine analysis shows that the construction-market signal is not simply that Heathrow has moved closer to expansion. The stronger signal is that government is now trying to lock the policy architecture around one of the UK’s most politically exposed infrastructure programmes before a future DCO examination.
What The Draft HENPS Would Cover
The draft HENPS applies to development consent applications covering a Northwest Runway of up to 3,500m, forming part of a scheme capable of enabling at least 260,000 additional air transport movements a year. It also covers associated terminal infrastructure, terminal reconfiguration, surface access facilities and changes to the strategic road network.
| Policy signal | What government has published | Construction-market meaning |
|---|---|---|
| HENPS consultation | A proposed revised policy framework for Heathrow expansion, open for consultation until 1 September 2026. | The project has moved into a live policy-definition phase, but consent has not been granted. |
| Northwest Runway scope | A runway of up to 3,500m, supporting at least 260,000 additional air transport movements a year. | The work would be a major integrated infrastructure programme, not a standalone runway package. |
| Critical National Growth Infrastructure | The draft policy designates Heathrow expansion covered by the HENPS as Critical National Growth Infrastructure. | Government is strengthening the planning-policy weight behind the scheme, while still requiring detailed assessment. |
| Surface access | Promoters would need to address road, rail, public transport mode share and strategic network impacts. | The civil engineering scope could extend well beyond the airfield into transport, highways, rail interfaces and local disruption control. |
| Home Office assets | Government has separately invited promoters to engage with the Home Office on immigration removal centre reprovisioning. | The expansion programme includes sensitive enabling works and secure operational requirements, not only aviation construction. |
Why This Matters To Construction
Heathrow expansion would touch several parts of the construction supply chain: aviation civils, tunnelling and earthworks, terminal construction, building services, utilities, highways, rail interfaces, logistics, demolition, environmental mitigation, security infrastructure, temporary works and programme controls.
The draft policy also makes clear that a compliant scheme cannot be treated as a runway in isolation. The government expects a complete Northwest Runway scheme, including runway, terminal capacity and supporting infrastructure, capable of operating as an integrated airport. Phasing may be acceptable, but only where the sequencing is coherent and does not prevent the completed scheme from being delivered.
That creates a practical construction issue. Any promoter will need to prove not only that the runway can be built, but that airport operations, passenger growth, surface access, environmental limits, security assets, community impacts and commercial delivery can be managed together.
The Economic Case Still Carries Risk
The government’s press material presents Heathrow expansion as a growth measure, with potential benefits for connectivity, freight, trade and jobs. The supporting appraisal also estimates passenger and wider economic benefits in the range of £29.2bn to £42.4bn over 60 years, alongside up to 61,000 additional local jobs by 2055.
But the appraisal is not a simple blank cheque. The Department for Transport’s economic analysis also presents negative net present value ranges once monetised impacts are combined, depending on assumptions around costs, carbon, demand and how costs are passed through. That matters because construction opportunity will be filtered through financeability, affordability, environmental evidence and planning scrutiny.
For contractors and consultants, the likely opportunity is therefore not immediate volume. It is early-stage positioning around evidence, design assurance, programme integration, environmental control, stakeholder management and technical deliverability.
Home Office Assets Add A Sensitive Workstream
Alongside the HENPS consultation, the Department for Transport and Home Office have published guidance inviting Heathrow expansion promoters to engage directly on immigration removal centre reprovisioning. The letter refers to the need to relocate facilities north-west of Heathrow and says proposals must support safe, secure and humane operation while adapting to future operational requirements.
This is important because it shows that Heathrow expansion is already being treated as a programme of linked enabling constraints. Secure facilities, statutory obligations, confidentiality arrangements, design authority oversight and operational standards all sit beside the more visible runway and terminal works.
The Home Office letter states that this engagement does not form part of the formal development consent order process. Even so, the existence of the workstream points to the type of sensitive, high-control construction packages that could sit around the main aviation scheme.
What Happens Next
The consultation will run until 1 September 2026. Government will then consider responses and parliamentary scrutiny before deciding whether to designate the amended HENPS. Any future Heathrow expansion application would still need to go through the statutory development consent order process, including detailed examination by the Planning Inspectorate and a final decision by the Secretary of State.
The government has indicated that a final decision on any application could be taken in the first half of 2029. That means the construction sector is not looking at an immediate start on site. It is looking at a period where policy, planning evidence, commercial models, environmental arguments and promoter strategy will determine whether the programme becomes a deliverable project.
Heathrow is now moving from political announcement into planning architecture. For construction, that is where the real test begins.
What the Evidence Shows
Direct answer: The government has not approved Heathrow’s third runway. It has opened consultation on the draft policy framework that would guide any future development consent decision.
The draft HENPS would apply only to Heathrow expansion through a Northwest Runway scheme and associated infrastructure.
The proposed scope includes a runway of up to 3,500m, terminal infrastructure, terminal reconfiguration, surface access and strategic road network changes.
The draft policy designates covered Heathrow expansion works as Critical National Growth Infrastructure.
Separate Home Office guidance confirms that immigration removal centre reprovisioning remains a sensitive linked workstream for promoters.
Any future scheme would still require a development consent order and detailed examination before a final decision.
FAQ
Has Heathrow’s third runway been approved?
No. The consultation is about the draft Heathrow Expansion National Policy Statement. It does not grant development consent or approve a specific scheme.
No. The consultation is about the draft Heathrow Expansion National Policy Statement. It does not grant development consent or approve a specific scheme.
What is the Heathrow Expansion National Policy Statement?
The HENPS is the proposed planning policy framework that would guide how any future Heathrow expansion development consent application is assessed.
The HENPS is the proposed planning policy framework that would guide how any future Heathrow expansion development consent application is assessed.
What construction works could be covered?
The draft policy covers a Northwest Runway, terminal works, reconfiguration of existing airport infrastructure, surface access facilities and strategic road network changes linked to Heathrow expansion.
The draft policy covers a Northwest Runway, terminal works, reconfiguration of existing airport infrastructure, surface access facilities and strategic road network changes linked to Heathrow expansion.
Why are immigration removal centres mentioned?
Existing Home Office assets north-west of Heathrow are affected by the expansion context. The government has invited promoters to engage with the Home Office on reprovisioning requirements.
Existing Home Office assets north-west of Heathrow are affected by the expansion context. The government has invited promoters to engage with the Home Office on reprovisioning requirements.
When does the consultation close?
The consultation closes at 11:59pm on 1 September 2026.
The consultation closes at 11:59pm on 1 September 2026.
Source Context and Editorial Note
This article is editorial analysis by London Construction Magazine based on Department for Transport and Home Office material published on 18 June 2026, including the draft Heathrow Expansion National Policy Statement consultation, the proposed draft revision to the Airports National Policy Statement, the Heathrow Expansion Appraisal Report, the 2026 UK Aviation Forecast and the Home Office promoter engagement letter on immigration removal centres. It is written as a construction-market interpretation, not as legal, planning, financial or procurement advice. Readers should refer to the official consultation documents and obtain professional advice before making commercial, investment, planning or compliance decisions.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
