How the proposals could affect Spelthorne residents

Heathrow expansion image1

(Image credit: Heathrow Airport).

There is no doubt that, whilst the expansion of Heathrow will bring economic benefits to the borough, some areas are going to be affected more than others, particularly Stanwell and Stanwell Moor.

It is important that residents are aware of, and have their say about, the potential effects of the expansion on the local area, the options for which have been shared with the public as part of Heathrow's new consultation, launched on 17 January.

The consultation includes plans designed to help shape the expansion including of the site itself, Terminal 5, changes to taxi-ways, road layout, M25 junctions 14 and 14a, and river diversions. The consultation plans also highlight potential development around Stanwell and Stanwell Moor for airport-related uses such as car parking, hotels, warehousing and a relocated Immigration Removal Centre (IRC). There are also important details about the potential impact of the construction process on the local area.

Please see below maps and details that relate particularly to the local area which have been extracted from the consultation documents. The full set of documents can be accessed here.


Expansion of the airport site

Heathrow expansion image2

The airport may extend terminal 5 and the western apron (Image credit: Heathrow Airport).

Terminal 5: One option being considered by Heathrow is to expand Terminal 5 and the western apron (aircraft parking spaces) to the west. This would expand the airport site towards the M25, so it hangs north of Stanwell Moor.

Southern taxi-way west: The airport is also considering extending the southern taxi-way west, where Stanwell Moor Road currently lies - the road would need to be diverted around the expanded airport.


The proposed expansion of the taxi-ways 

Heathrow expansion image3

(Image credit: Heathrow Airport).

Green belt land could be affected by the expansion of the taxi-ways, for which the Airport say there is a "strong operational need"

Road changes

Local roads which would be severed by expansion

Heathrow expansion image4

(Image credit: Heathrow Airport).

A3044: The proposals remove a major section of the A3044 between Harmondsworth and Stanwell Moor and affect connections between the A4 and A3113.

Southern Perimeter Road: There could be more lanes on this road.

M25: May be moved 150m to the west. Changes to the layout of Junctions 14 and 14a to improve capacity.

The two options are:

  1. To retain both J14 and J14a, redevelop J14 and alter J14a to fit with the westerly expansion of the airport.
  2. To close J14a (which currently provides direct access to T5) and redevelop J14 to accommodate the displaced road traffic from J14a.

Stanwell Moor junction

Heathrow expansion image5

(Image credit: Heathrow Airport).

There are four options:

  1. Through traffic to be directed on the A3113/ Southern Perimeter Road into a roundabout with access to Terminal 5 to the north, and Staines and Stanwell to the south.
  2. Similar to Option 1 but with a different roundabout arrangement.
  3. Through traffic maintained on the A3113 / Southern Perimeter Road at ground level with the roundabout below it for access to Terminal 5 to the north and Staines and Stanwell to the south.
  4. A two-tier free flow arrangement.

Associated development in and around Stanwell and Stanwell Moor

The airport has identified eight sites which may be developed or used for construction if the expansion goes ahead, which can be seen on the map below.

Heathrow expansion image6

(Image credit: Heathrow Airport).

  1. Could be part of the expanded airfield, or used for parking.
  2. Could be used as parking for lorries using the airport's cargo area.
  3. This site, around Stanwell Moor village hall, may include offices and/or warehouses or used for the treatment of water from the airfield. Other options are for it to house an Immigration Removal Centre (IRC) relocated from sites north of the A4.
    Heathrow concedes that the site is in Green Belt and provides a buffer between Stanwell Moor and Stanwell. However they say that the site "occupies a unique, strategic location at an important entrance to the airport from the south and west" and so think there may be exceptional circumstances to allow the development of the site.
    "The site is in close proximity to residential properties to the south and west and therefore development of this site for a replacement IRC will need to be of the highest design quality which respects the adjacent uses and their occupiers."
  4. Could be used as multi-storey parking (up to 20,000 spaces), and may include offices or hotels. It could also be used on a temporary basis during the construction of the expanded airport.
  5. Could be used for warehouses to support Heathrow's expanded cargo operation.
  6. Could be used as reed beds for treating water from the airfield - one of two locations being considered for a potential Waste Water Treatment Works.
  7. Parts of this site - already owned by Heathrow - could be developed for offices, airport operations and/or industrial space linked to the airport. The western part could be used for reed beds for treating water from the airfield.
  8. Could be used for airport supporting uses like flood drainage, or warehousing, or hotels.

River diversions and flood storage

Expanding the airport would require river diversions.

The three main rivers in the Colne Valley are the River Colne, the Colne Brook and the Wraysbury River.

The airport has shortlisted four options for this:

  1. To divert the River Colne, River Wraysbury, Duke of Northumberland's and Longford Rivers, and the Colne Brook under the runway to return to their existing paths downstream
  2. Similar to option 1, but to divert the Colne Brook around the western end of the new runway
  3. Includes an additional diversion channel around the western perimeter of the airfield
  4. Similar to option 3 with more extensive new channels to the west around Colnbrook village

Construction requirements

The construction requirements include contractor compounds, lorry parks, temporary construction workers' accommodation and sites to store materials.

Potential construction sites are identified in Spelthorne on land north of Staines Moor and the land in Stanwell and Stanwell Moor that could be used for other airport related development.

Heathrow expansion image7

(Image credit: Heathrow Airport).

Individual assessments for sites potentially suitable for airport related development are at Appendix 3 (from Page 156) on Heathrow's Emerging Plans document

The ones in Spelthorne are:

E3: Land at London Road/Short Lane pg 180

E4: Land at Bedfont Road/Long Lane pg 182

F1: Land bounded by Stanwell Moor Road, Horton Road and Airport Way pg 184

F2: Site bounded by Southern Perimeter Road, Park Road and Stanwell Moor Road pg 186

F7: Site to the north of Wraysbury Reservoir and to the south of Horton Road, bounded to the east by Wraysbury River pg 188

NS7: Land to the south of Bedfont Road and between Clare Road and Northumberland Close pg 214

NS8: Land to the north of Long Lane Recreation Ground, to the south of Northumberland Close and to the west of Long Lane pg 216]

This consultation is your opportunity to share your views on the options for how Heathrow could expand. Your feedback will inform a second consultation next year where Heathrow will present detailed plans and again ask for your views before finalising their proposals.

Visit to find out more and to respond to the consultation.