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Glossary of Terms

Below is a list of terminology referenced throughout this consultation website and the supporting documents.

If you have any further queries please contact us using the details on this website, here

How do we get permission for expansion?

To get permission for the expansion of Heathrow we must apply for a Development Consent Order (DCO) under the Planning Act 2008. As part of this process there will be opportunities for the public to see our proposals and give their feedback, starting with this consultation. Our DCO application will be examined by Inspectors appointed by the Planning Inspectorate and the Secretary of State for Transport will make the decision on whether to grant or refuse permission for the scheme to go ahead, taking into account in particular the ANPS. Further information can be found in our DCO Process Information Paper.

What are listed buildings?

The Government is able to designate those buildings which are recognised as having ‘special architectural or historic interest’ through listing. These fall within three levels (grades I, II* and II) depending on their relative significance. Listing affords these buildings with statutory protection.

What are terminals, satellites, and aprons?

Terminals are buildings at an airport where passengers transfer between ground transportation and the facilities that allow them to board and disembark from aircraft. Some passengers will board aircraft directly from terminals, whereas others will
transfer to remote satellites to board aircraft.

Aircraft require areas for parking, unloading or loading, refuelling and boarding passengers. These are known as aprons and are usually located adjacent to terminals or satellites.

What is a Community Engagement Board?

A Community Engagement Board (CEB) will support community engagement throughout the planning process for expansion – and longer-term into the operational phase of the expanded airport. It will play an important role in building trust between the airport and its communities and ensure Heathrow delivers on its commitments today and in the future.

What is a conservation area?

Specified areas of a community which have a definite architectural quality or historic interest can be designated as conservation areas which allow for wider protection to ensure the preservation of their character and appearance.

What is a flood plain?

The flood plain is an area next to a stream or river which experiences flooding at times of high flow.

What is a heritage asset?

Heritage assets may be buildings, sites, places, areas or landscapes which hold value to present and future generations as a result of their historical, archaeological or artistic interest.

What is a hub?

Hub airports combine direct passengers, transfer passengers and freight so that they can fill aircraft and serve destinations that cannot be served by airports which rely on local demand alone. Transfer passengers at a hub airport allow the UK to enjoy faster, year-round connections to countries to which it could not otherwise sustain a direct flight.

What is a watercourse?

A watercourse is a river, brook, stream or artificially constructed water channel through which water flows.

What is biodiversity offsetting?

Offsetting is a term used for nature conservation measures that are provided to compensate for losses resulting from a development.

What is flood storage?

Flood storage is an area of land that holds areas of excess water so that homes and businesses are not flooded.

What is green infrastructure?

Green infrastructure is a term used to describe the network of green space and water environments in and around towns and cities.

What is habitat connectivity?

Habitat connectivity enables wildlife to move through a range of habitats in a local area. Good levels of habitat connectivity increase the potential for local populations of animals and plants to survive and thrive in the long term.

What is the Consultation deadline?

The deadline for responding to this consultation is 11.55pm on 28 March 2018.

What is the Cranford Agreement?

The Cranford Agreement was an agreement between the Government and the residents of Cranford which restricted the number of take offs from our northern runway in an easterly direction over the village. The agreement is no longer in place. Further details can be found here.


What is a logistics hub?

A logistics hub is either a consolidation centre or an off-site factory where materials for building the project will be preassembled before being transferred to the site. Four
logistics hubs are proposed around the UK which will spread the benefits of the expansion of Heathrow beyond the local area.

What is a noise envelope?

A Noise Envelope is a framework for the sustainable management and control of the effects of noise that balances growth and noise reduction and provides certainty
about how noise will be addressed for the long term.