Colnbrook and Poyle*

The western end of the new runway will be located to the north of Colnbrook and Poyle. We will work with you to try and minimise its effects during construction and operation.

*This page contains one (1) question located within the “Have your say” section at the bottom of the page.

What happens in Colnbrook and Poyle

The area around the villages will include replacement public open space and a section of the new Green Loop, which will provide a recreational route around the airport. There will be a ‘green envelope’ around the villages.

The road and river diversions are shown on the map below. The Colnbrook By-Pass will be diverted in two directions. The A4 Bath Road will be re-routed round the north of the runway and the A3044 will move to the west of the M25.

We also need to put the M25 into a tunnel, move it closer to Poyle and improve the junctions with the airport and the M4. The area will benefit from works to reduce the risk of flooding.

These changes mean we will need to buy a handful of properties in Poyle.

Part of the area to the north of the new runway, west of the M25, will become a rail facility to replace and improve similar facilities that will be lost. This may include a replacement waste incinerator for the facility that will be lost in this area.

We also need space to expand the Poyle Industrial Estate, and to move the Heathrow Special Needs Centre to a site south of Poyle High Street.

We are in the process of assessing the impact of noise on the local community facilities, including schools, which may increase once the runway is open. Depending on our findings we may need to improve the noise insulation of these buildings.

Things we’ve changed after listening to you

  • We have moved the diverted roads (the A4 and the A3044) so they are slightly further away from the villages
  • We are proposing more planting between the villages and the diverted Colnbrook By-pass
  • The Green Loop responds to requests for better walking and cycling routes
  • We are proposing improvements to the “green envelope” around Colnbrook and Poyle
  • We are providing more detail on the options for the airport boundary
  • We have done an assessment of the risks to the conservation area to help us protect historic buildings

Our property policies

To construct and operate an expanded Heathrow we will need to acquire areas of land which currently include residential, commercial and agricultural properties.

MAP | This map shows the areas within our property compensation zones. For assistance, please contact our community relations team using the contact details on this website.

Compulsory Purchase Zone

This area will need to be acquired for the expansion of Heathrow and is referred to as the Compulsory Purchase Zone. Properties in Longford, Harmondsworth (excluding Zealand Avenue and Pinglestone Close), Sipson and Elbow Meadow in Poyle will be required in 2022. It is anticipated that Zealand Avenue and Pinglestone Close would be required in 2026 but these will be affected by construction from 2022.

Heathrow has developed a discretionary enhanced compensation offer where we will buy eligible properties for the open market value plus a home loss payment of 25%. For homeowners, this will be available via the Home Purchase Bond Scheme.

Our Property Policies Information Paper provides details of our compensation offers and eligibility for the schemes.

Wider Property Offer Zone

The above offer also applies for eligible residential properties in the Wider Property Offer Zone.

Both zones referred to above are shown on the map above.

How we will help

We recognise this could be a difficult time for home owners. Our plan is to provide support through our Home Relocation Support Service, where home owners require additional assistance to move home.

It is our intention to protect the most vulnerable owners. We have introduced an interim Property Hardship Scheme that assists those who have a compelling need to move but who are unable to sell their house on the open market, by selling their property to Heathrow.

Commercial and other property policies

Our interim property policies also include the support that is available for commercial and agricultural land and property owners.

Beyond the Compulsory Purchase Zone

Beyond the Compulsory Purchase Zone there are other areas of land which may be needed for associated infrastructure, environmental mitigation and other uses to facilitate the project. The draft Development Consent Order Limits are the extent of land beyond the Compulsory Purchase Zone where we may need to exercise DCO powers for the construction or operation of the project. There are no residential properties beyond the Compulsory Purchase Zone anticipated to be required for acquisition for the project.

Further information is available in the Property Policies Information Paper.

Register your interest

We are keen to hear from residents who are interested in the Home Purchase Bond Scheme and are considering views as to when homes could be sold to Heathrow. We have sent a Contact Request Form to residents and would like to receive responses during consultation.

We will provide more details of the Home Purchase Bond Scheme, including the intended launch date, as soon as we finalise our interim property policies, which will take account of feedback received and once we have clarity on regulatory policy from the Civil Aviation Authority. You can complete the Contact Request Form online at or can e-mail us at [email protected] to arrange a follow-up with a member of our team.

You can find further information on our compensation offers in our Property Policies Information Paper. We are seeking feedback on the policies as part of this public consultation.

Green space around the villages

As well as investment within the villages, we are also proposing major improvements to the landscape and environment around them.

Improvements to the landscape will enhance the public open space around Colnbrook and Poyle, and improve access to the countryside.

The re-diverted A3044 will be screened by planting to help visually integrate the airport and roads into the landscape.

The Green Loop will connect Colnbrook to Stanwell Moor, Brands Hill and Harmondsworth. It will follow the reinstated Lime Tree Avenue to provide the historic route to Richings Park.

The landscape and the ‘green envelope’ around the village will help improve the setting of heritage assets and increase open space, sports and recreation provision.

Enhanced footpaths and cycle ways
Boost recreation and healthy living through walking and cycling, connecting communities and important green spaces
Wildlife corridor
Enhance corridors for wildlife and biodiversity through improvements to existing areas such as Horton Brook
Enhance existing parks
Enhance the existing Recreation Grounds and Pippins Park and improve access to the countryside
Connecting Colne Valley regional park
Improve access within the Colne River Valley with clear routes and footpaths
Attenuation ponds
Enhance existing blue infrastructure through habitat improvements and increasing the community access to the natural environment
Airport boundary
The airport boundary is to be screened reducing visibility and creating a strong landscape edge

Airport boundary

We have some options for how we design the new boundary of the airport. It needs to be at least three metres high and have a three metre security zone on each side but it can be different in places around the airport.

In other places it may be necessary to have a taller boundary to help minimise noise and visual intrusion. Where possible we will incorporate landscape planting to soften its appearance.

To the north of the villages the A3044 and its intended landscape planting will help to screen the road, runway, taxiways and other surface water drainage areas.

The images below show the sort of things we could put between the airport boundary and Colnbrook and Poyle
at the points marked A, B and C on the map below.

Airport boundary options
Airport boundary locations


Expanding Heathrow is more than building a new runway – we also need to build facilities for passengers, make changes to roads and car parks, and relocate some of the existing airport infrastructure.

Over the past two years we have engaged with and considered the views of over 1,000 stakeholders and our local community to help develop our preferred scheme. Over time, our new runway will increase our flights from 480,000 to just over 750,000 per year. About 80 million people fly with us each year today. This will increase to about 142 million. We will also double the amount of cargo we can handle.

As part of our application to expand Heathrow, we propose that some of the extra flights, which could be up to 25,000 additional flights per year, are introduced early on our existing two runways prior to our proposed third runway being brought into operation.

The map below shows the key features of the new airport when we have finished building. On Local overview – How we will build it we show the steps we will take to get there.

We want to finish the runway as soon as possible. If we get permission, we are aiming to complete it by the end of 2026. When the runway is open we will have finished most of the work closest to communities. Most work after that will be inside the new airport boundary. The main works outside the new airport boundary will be to Stanwell Moor Junction, the southern parkway, and the northern parkway.

Local construction impacts

The images below show construction impacts at different times. For more information on each period, please click on the expandable sections below.

Early construction
Peak construction (2023-2024)

Early construction

  • Preparation will begin on land west of the M25 and south of the M4 for the start of earthwork activity. This will include the demolition of existing industrial units to the north of the A4 Colnbrook Bypass.
  • Construction support sites will be established along the A4 Colnbrook Bypass. These sites will include functions such as welfare facilities, temporary offices, parking for workers and the necessary infrastructure to support temporary accommodation. They will support activities across the project, some of which will need to be 24-hours, 7-days per week.
  • A new railhead at Colnbrook will be constructed to bring in goods and materials by rail and help reduce our road usage and carbon footprint.
  • Work will start on a temporary road crossing over the M25 for goods to be transported to site and reduce the impact on local roads.
  • There will be a phased infilling of Old Slade Lake and excavation of the borrow pit north of the M4 motorway at Poynings.

Peak construction (2023-2024)

  • This will be the period of peak construction and earthworks activity.
  • The construction support sites will be fully operational and accessed via the M4 and A4 Colnbrook Bypass. HGVs will be held here if necessary while waiting to make deliveries to the main construction site to help keep the surrounding roads clear.
  • We will operate a delivery management system to ensure HGVs stay away from residential areas including Bath Road in Colnbrook and Poyle.
  • The new railhead will be fully operational helping to reduce the number of vehicles on the surrounding roads.
  • Construction traffic will enter the site via the A4 and then use internal construction roads within the site boundary. The work will complete on a new temporary bridge of the M25 to the north of the A4 Colnbrook Bypass.
  • The new A3044 will complete and open to the public while construction will continue on the new A4 and M25 diversion.
  • Utility supplies will be rerouted to ensure electricity, water and gas suppliers are protected for the local community.
  • The Grundon recycling and waste facility in Colnbrook will be demolished
  • The construction support site to the north of Poyle will be decommissioned and developed into a permanent drainage zone for the new airfield.


  • The new sections of A4 and M25 will open to the public.
  • Earthworks will be mainly complete with only localised pockets to be finished for example around Grundon recycling and waste facility.
  • We will be constructing the runway, taxiways, other facilities and airside roads.
  • Around the exterior of the site we will start delivering the new permanent landscaping.
  • The construction support sites will be required after 2026 and we will continue to use the railhead at Colnbrook.


  • The construction support sites will be required after 2026 and we will continue to use the railhead at Colnbrook.

Changes to roads and local traffic

Changes to roads

To make space for the runway we will need to divert the Colnbrook By-Pass in two directions but we are doing lots of analysis to plan new or diverted routes and minimise disruption.

The A3044 needs to be moved from the western edge of the airport to the west of the M25. It will pass between the new runway and the north of Colnbrook and Poyle. It will then head south between Poyle and the M25 and connect into Junction 14 of the M25, providing access to Stanwell Moor and the southern part of the airport. We are proposing a cycle path along the rerouted A3044.

A new A4 Bath Road will go from Colnbrook round the north of the new runway, over the M25, past Saxon Way and to the north of Harmondsworth. It will then head round Sipson and across the M4 spur where it meets the new parkway. It would then be routed to the south to re-join its old route to the east of the M4 spur.

Our proposals allow for it to be a dual carriageway, but we currently believe a single carriageway will be sufficient. We will do further analysis before we decide this.

The M25 itself needs to move west and will be put in a tunnel.

Changes to traffic

While we do not expect the expanded airport to attract more traffic, there may still be localised increases and decreases. While the airport is being built there will also be construction traffic on some roads connecting the airport to the strategic road network.

The maps below give a preliminary indication of the possible changes to traffic levels in 2022 (during the construction phase), and in 2035 (nine years after we expect the runway to open). These forecasts will be reviewed and updated before we formally apply for consent to expand the airport.

Your responses to this consultation will help us to understand how these potential changes would affect you. There are a range of measures we could use to address any specific concerns. These range from improved signage or changes to junction layouts to measures to promote the use of public transport and encourage the more efficient use of cars.

Changes to traffic - 2022
Construction traffic supporting the expansion of Heathrow is expected to be highest in late 2022/early 2023, just prior to the expected opening of the proposed construction rail link. Traffic on A4 (Colnbrook Bypass) would be expected to increase in 2022, as this is being considered as one of the main access routes for the construction site. We do not expect any significant increases in traffic on other local roads around Colnbrook and Poyle as a result of expansion in 2022.
Changes to traffic - 2022
Results of preliminary transport modelling indicate that in 2035, once the expanded airport is fully operational, daily traffic levels could be higher on London Road between Brands Hill and Colnbrook, on Poyle Road, on Bath Road east of Poyle Road, on Colndale Road, and on Horton Road as a result of expansion. Traffic would be lower on High Street, Bridge Street, Park Street and Bath Road through Colnbrook. Daily traffic levels could also be reduced on Bath Road west of Poyle Road. This is because of proposed changes to the road network.

Air quality – Colnbrook and Poyle

The expanded airport will be designed to reduce emissions and our plans include ways to manage:

  • The way that people travel to the airport by
  • increasing the use of public transport.
  • The use of cleaner, more sustainable vehicles.
  • Emissions from older, more polluting cars by introducing a Heathrow Ultra Low Emission Zone to charge these vehicles to access the airport.

During construction, air quality in Colnbrook and Poyle may be affected by dust and vehicle emissions.

There will be increases in pollutant levels associated with expanding the airport, but these are not considered to be significant. Levels of all pollutants will be within the levels set by the Government to protect health.

The smell of aviation fuel may be noticeable at locations closest to the airport during certain weather conditions.

For more detail on air quality, please see Local overview – Air quality.

Noise in Colnbrook and Poyle

A larger Heathrow may mean some local communities will hear more noise from construction activities, from aircraft on the ground and in the air, and from local roads.

We will implement a range of measures to reduce the effects on the local community.

Construction noise

The construction of the A3044 and the works associated with the M25 diversion are activities where potential construction noise effects have been identified.

Effects are likely to be experienced within the communities of Colnbrook and Poyle. As described earlier in the document, all our construction activities will follow a ‘Code of Construction Practice’ to help manage noise.

We will provide insulation to reduce noise impacts for homes and community buildings where it is needed. In some instances, we may offer temporary re-housing, for example during periods of very noisy works such as demolition or piling.

More information on insulation and temporary re-housing is available in the Noise Insulation Policy document.

Aircraft noise

Noise effects from aircraft are likely to be experienced over Colnbrook and Poyle. Colnbrook and Poyle experience flights directly overhead today from departures and arrivals using the current northern runway.

The existing northern runway is the main runway used for arrivals during easterly operations due to the legacy of the “Cranford Agreement”.

Before the new runway opens, we are planning to introduce runway alternation on easterly operations and arrivals will also land on the southern runway.

The new runway will mean an increase in noise from aircraft landing and taking off close by the communities of Colnbrook and Poyle to the north.

To reduce noise, we are proposing to build noise barriers around the airport (see “Airport boundary” above).

Ground noise

There will also be noise on the ground from aircraft moving around the airport and from their maintenance and testing.

To reduce this noise, we are proposing noise screens around the airport and controls over where and when aircraft maintenance activities can take place.

Road noise

Noise from roads near to and within Colnbrook and Poyle – such as the re-aligned A3044 and M25 – is forecast to increase for nearby residents.

We will review the need for noise insulation, screening and very low noise road surfacing as part of the Environmental Statement to reduce noise further.

Reducing noise effects

We have a number of proposals and plans in place to reduce these noise effects, which are described within Local overview – Reducing noise effects.

Noise insulation will be provided to eligible community buildings that are likely to be affected by noise in Colnbrook and Poyle.

Further information

For further information on how we have assessed noise see the PEIR, Volume 1, Chapter 17: Noise and Vibration, Section 17.11. For more information on our proposals, please see section 5 of the Airport Expansion Consultation Document and the Future Runway Operations document.

Runway use to control noise

How we run our three-runway airport in the future will be key to controlling aircraft noise in local communities. Alternating runways will provide respite from aircraft noise.

Runway alternation

We are proposing that we change how we use the runways at either 2pm or 3pm everyday. The runway alternation patterns will repeat every four days (so day five will have the same pattern as day one). See the image in the next section.

Night flights

We propose to introduce a ban on scheduled night flights of 6.5 hours between 11pm and 5:30am.

Our proposals ensure that, in normal operations, Colnbrook and Poyle can expect at least 7 hours when aircraft will not be flying overhead between 10pm and 7am every night.

Also, if you are overflown in the late evening (after 11pm) you will not be overflown in the morning (before 6am).

What will this be like in Colnbrook and Poyle?

The illustration below shows what this would mean in the future, compared to today, for daytime and night-time respite in Colnbrook and Poyle over a 4 day period. The green colours show periods of respite, and the orange colours show periods of direct overflight.

Whether Colnbrook and Poyle get noise from aircraft overhead will depend on the direction of the aircraft (heading east or west) and which “mode” the runway is being used in. The modes are landings only, departures only or “mixed-mode” (both landings and departures). The existing northern runway (to the east of Colnbrook and Poyle) will not be used in mixed-mode.

For example, when planes are taking off to the west (and landing from the east) Colnbrook and Poyle will not get noise overhead when the existing northern runway is being used for landings but will get noise overhead when it is being used for departures.

When planes are taking off to the east (and landing from the west) Colnbrook and Poyle will not get noise overhead when the northern runway is being used for departures. It will get noise when it is being used for landings.

Events and more information

Please also see the related local area overview pages for more information:

  • During this consultation we are also hosting 43 events. To find an event near you, visit Events.

Have your say

Our Heathrow Expansion and Your Area documents set out our development proposals, their potential effects and how we propose to reduce them.

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