Expansion will bring a lot of change for Harmondsworth. We want to work with you to manage the process and minimise the disruption and effects that may be caused, as well as maximising opportunities for your area.

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

We know that building the runway will cause disruption to people in Harmondsworth. If we get permission, we will build it as soon as we can and aim to complete the major construction works by the end of 2026.

What happens in Harmondsworth

If development consent is granted, the new runway will be located to the south of the High Street and means we will need:

• To buy and demolish around two thirds of homes within the village

• The land where the recreation ground, primary school, community hall and nursery are currently located

• To close Hatch Lane and divert the A4 Bath Road round the north of the village

• To move Moor Lane allotments

We intend to provide a new community hall and nursery within the village, but Harmondsworth Primary School will need to move to a quieter location to the north of the M4.

We will be investing in the heart of the village, and in particular around Harmondsworth Barn and St Mary’s Church to improve their environment and provide a new community hub. We are also proposing to create new and improved green space including allotments and a new walking and cycling route around the village.

We want your views on what facilities should be within the community hub and how best we should focus our investment.


Things we’ve changed after listening to you

  • We think we can reduce the new A4 north of Harmondsworth to a wide single carriageway instead of a dual carriageway;
  • Improved access to Harmondsworth Moor through a proposed new country park with community gardens and relocated allotments;
  • The Green Loop responds to requests for better walking and cycling routes (see below);
  • Our proposals for the village green, barn and church reflect feedback from the Community Engagement Workshop we held in Harmondsworth; and,
  • We are providing more detail on the options for the airport boundary.

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 aec.heathrowconsultation.com/compensation 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.

Your village

Harmondsworth Barn and St Mary's Church
Harmondsworth Barn and St Mary's Church

Harmondsworth Barn and St Mary’s Church 

We are exploring options for Harmondsworth Barn and its surroundings to ensure it has a strong future. We will also explore the potential of St Mary’s church and other buildings in Harmondsworth. The barn and the church could be adapted. This would allow them to host exhibitions and events for the community

We are proposing a visitor centre to provide information and services to visitors to the area, such as people using the Green Loop. Services could include a viewing platform, café, and other amenities. It would also serve the Harmondsworth Country Park.

The High Street

We will also support the High Street and its businesses. We will improve the streetscape and central courtyard area. We are likely to become the owners of several buildings. We will manage them to ensure they support a stable long-term future for Harmondsworth. This might be renting them to families or converting them to small offices or hotels.

Community Hub

We are proposing a new community hub to replace the community hall. We would like your views on what it should include, such as a café, nursery or library. We think this could be provided in an existing building as there are several that could be suitable.

Harmondsworth Primary School

We are proposing to relocate Harmondsworth Primary School, which will be displaced by the new runway. The proposed location for the new school is to the north of the M4 near Stockley Road. It is within the school’s current catchment area and has appropriate road access and connections to green areas. This site also has the benefit of being able to support the early delivery of the new buildings, so the school can transfer smoothly.

Green space around the village

The landscape of Harmondsworth Moor will be improved to create an enhanced country park.

This will have walking and cycling routes that incorporate local features such as The Great Barn and Saxon Lake within a countryside setting. Landscape features and planting will help create a heritage setting for the Great Barn and the western side of the village. Saxon Lake will become an asset of the local natural environment and be part of the wildlife corridor.

Routes through the country park will incorporate a cycle/pedestrian link, called the Green Loop, providing recreational connectivity to the wider area around the airport.

To help reduce noise and visual effects of airport operations, a noise wall and grass bund will be on the southern boundary of the village. The wall will be visually reduced by mounds and planting with a series of enclosed walled gardens incorporating ‘play on the way’ features and the Green Loop.

Saxon Lake and Harmondsworth Moor
Preserve and enhance river corridors, adjacent wetland features and Harmondsworth Moor
Habitat sites
Enhance sites for wildlife and biodiversity at Harmondsworth Moor and the Wraysbury and Colne Rivers
Allotments and community gardens
Promote growing and foraging opportunities through projects such as allotments re-provision
Boost recreation and healthy living through walking and cycling, connecting communities and green spaces
Balancing ponds
Creation of flood storage areas to prevent flooding, incorporating wetlands and ponds for habitat improvement
Noise walls and bunds
Acoustic wall finishes to be sympathetic to the village architecture and provide opportunities for walled gardens
Green space around Harmondsworth overview
1) Enhanced Harmondsworth Moor with upgraded footpaths and links to the wider area. 2) Enhanced Moor for public open space including wildlife corridors and enhanced setting to historic asset. 3) Enhanced public open space and setting for historic assets. 4) Potential walled gardens. 5) Additional areas for biodiversity.

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.

We have some options for how we design the new boundary of the airport.

We are proposing there should be a wall here and that it should be five metres high to reduce the noise from the airport but with an embankment so that it appears lower. We think we should use bricks to reflect the character of Harmondsworth and create something like a walled garden to create spaces of different sizes in different places.

Airport boundary
Overview of illustrative airport boundary with Harmondsworth.
Airport boundary options
These images show the sort of things we could put between the airport boundary and Harmondsworth at the points marked A, B and C on the map opposite.


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 for the sites north and south of Harmondsworth Lane for the start of earthwork activity. These include a borrow pit and a stockpile site linked by a dedicated haul construction road. The road will have a bridge over Harmondsworth Lane to avoid impacts for local traffic.
  • Fencing, landscaping and stockpiles will be installed around all construction sites to reduce the impact on the community.
  • A construction support site will be established on Holloway Lane, to the east of Harmondsworth Road. This facility will include workforce welfare facilities, site offices and infrastructure for caravans for some workers.
  • Principal access to the site will be off the M4 Junction 4 via Holloway Lane, to avoid other local roads in and around Harmondsworth and Sipson.
  • The borrow pit will have an engineered lining to contain the waste and isolate it from the surrounding area. We’re developing a strategy for mitigating odours during these works.

Peak Construction (2023-2024)

  • Earthworks around Harmondsworth and Sipson will reach their peak in 2023 as work on the main site progresses. This will include excavation of the borrow pit to the south of Harmondsworth and to the east of Saxon Lake.
  • Demolition of properties in Harmondsworth will occur during this period to establish the main perimeter of the new airfield.
  • Some construction traffic for the northern section of the main site will arrive from the north via the A3044 and then use internal construction roads within the site boundary.
  • We will work with the community to reduce the impact where possible by avoiding peak times and won’t permit HGVs to access village centres and high streets.
  • We will construct the new A4 between 2022 and 2024.
  • The section of Hatch Lane from above Zealand Avenue to Harmondsworth will be closed to the public. All other roads around Harmondsworth will remain open.
  • The houses on Zealand Avenue and Pinglestone Close can still be occupied, although there will be construction nearby.
  • A new channel will be completed for the Duke of Northumberland’s River to the east of Saxon Way.

End construction (2025-2026)

  • Earthworks around Harmondsworth and Sipson will largely be complete by this stage and final construction elements will be within the airport boundary.
  • We will be in the final stages of construction of the runway, taxiways, other facilities and airside roads.
  • Stockpile areas to the north of Harmondsworth Lane will be cleared and reinstated back to their original use.
  • The new A4 will be complete and open to the public.
  • Around the exterior of the site we will remove temporary construction materials and install new permanent landscaping.
  • Operational testing of the new runway will commence once airfield construction around Harmondsworth and Sipson is complete.

Roads, parking and traffic

Roads and parking

To make space for the runway, we will need to divert the A4 Bath Road and close Hatch Lane. We are carrying out lots of analysis to plan new or diverted routes and to minimise disruption in the local area.

The new A4 will come from Colnbrook, 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 is then 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 carry out further analysis before we decide this.

The new road will mean that two bus routes will need to change – the U3 and the 350. We will work with Transport for London on the new routes. We will keep you up to date with our progress on this. There will be crossing points on the new A4 to allow Harmondsworth residents to access the enhanced public open space to the north.

Roads and parking
A) A4 River crossing
B) A4 adjacent to Saxon Lake and Thermal Pond
c) A4 with landscape and flood storage attenuation

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.

Construction 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 the A3044 Holloway Lane 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 substantial increases in traffic on other local roads around Harmondsworth as a result of expansion in 2022.
Construction traffic - 2035
Results of preliminary transport modelling indicate that in 2035, once the expanded airport is fully operational, daily traffic levels would be lower on Harmondsworth Lane. This is because of proposed changes to the road network – in particular the closure of Hatch Lane.

Air quality – Harmondsworth

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 Harmondsworth may be affected by dust and vehicle emissions. There may also be odours (smells) when historic landfill sites are dug up. This will be managed to stop odours being given off.

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. Due to Harmondsworth’s close proximity to the new runway, there is likely to be a moderate increase in one pollutant (known as nitrogen dioxide) in the village, but this will be within the levels set by the Government to protect health.

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

Noise in Harmondsworth

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

Construction noise will be most noticeable for homes closest to the areas where the major work on roads and construction for the new runway will take place. These are described in Local – Overview How we will build it.

This noise may be noticed at any time of day or night affecting homes and community buildings such as St Mary’s Church. As described earlier in the document, all our construction activities will follow a ‘Code of Construction Practice’ to help manage noise.

Aircraft noise

Harmondsworth does not currently have flights overhead but noise from the airport can be heard in the village.

Because the new runway will be within 200 metres of Harmondsworth, some homes closest to it will experience very high levels of aircraft noise. We will reduce this inside homes by providing noise insulation.

Ground noise

There will also be noise on the ground from aircraft moving around the airport. Noise may also be noticeable when aircraft are serviced. To reduce this noise, we are proposing to build noise barriers around the airport – see Airport Boundary section above.

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.

For Harmondsworth, noise insulation will be provided for eligible community buildings that are likely to be affected by noise.

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.

Engaging further in Harmondsworth

We have developed our proposals to invest in Harmondsworth based on what you have told us and what we think we could deliver through our planning application. However, we recognise that Harmondsworth’s future should be shaped by working with its residents and Hillingdon Council.

We are confident in our plans for Harmondsworth and that it will continue to thrive. We take seriously our responsibility to limit and reduce the impacts of expansion and we will continue to invest in the local area.

In future we will know more about what you want, we will understand how many people want to stay in the village and how many want to sell their homes and leave.

We would like to play our part and work in partnership with Hillingdon Council as well as local residents and other interested parties (such as the owners and supporters of the church and barn) to develop our proposals and potentially to support other ideas that residents and the council develop.

Some of the ideas we have heard so far include extending the village with new businesses, homes and community space. Or it might mean allowing more houses to be converted to other uses or removing more buildings and increasing the amount of parkland. These are unlikely to be matters for our application for development consent but we would like to continue to be involved if that was welcomed locally.

Heathrow could provide funding through the expansion process, including our proposed community fund.

We would like to hear your views on this.

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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