M25 junction 10

Upgrading this stretch of road will provide vital improvements to its safety and reliability. At the same time, this scheme will involve some of the most extensive environmental mitigation ever carried out by Highways England, with over 40 hectares of land being used to replace the 14 that are needed to improve the junction.

Start date 2020-21
End date TBC
Cost £100 million to £250 million

Latest updates

  • 12 August 2020

    Scheme prepares for Secretary of State decision

    The Development Consent Order (DCO) examination was completed in mid-July, having been extended by two months as a result of the impact of COVID-19. The planning inspectorate are now writing their report which is due to be submitted to the Secretary of State for Transport during October, for his consideration. The Secretary of State decision is expected on 12 January 2021 with start of works planned in spring next year.

    Earlier in the year we awarded a contract to Balfour Beatty Atkins to build the scheme and we are now working on the detailed design and doing more surveys to inform this.  This includes environmental surveying on land surrounding the M25 and A3, as well as surveys on the road which will be done at night when it is less busy. That means there will be night time closures of some lanes in September and October for these surveys.

    Until we receive the Secretary of State’s decision we will be carrying on with the detailed design and planning how to build the scheme. You will be able to find out what the final design looks like and how we will build it at events at the start of next year.

  • 19 March 2020

    Formal examination

    Our proposals for the M25 junction 10/A3 Wisley interchange were accepted by the Planning Inspectorate on 17 July 2019 for formal examination. This is a significant milestone for our scheme, as it means we’ve taken a big step towards delivering much-needed improvements on this stretch of road. You can view our planning application on the Planning Inspectorate website.

    The Planning Inspectorate is half way through its examination of our scheme and this has involved multiple written questions and representations, and a series of public hearings, with the next ones due to take place 24, 25 and 26 March.

    These hearings have now been postponed until further notice due to the Covid-19 outbreak. Please check the Planning Inspectorate project page for the latest information on the DCO examination.

Project information


Our proposed changes include building four new dedicated free-flowing slip lanes that will mean all left-turning traffic can pass through the junction unimpeded by traffic signals.  Carriageways on the existing roundabout will also be elongated and widened to increase capacity for right-turning traffic. 

On the M25 the hard shoulders through the junction will be converted to running lanes with emergency refuge areas. 

We’ll also widen the A3 to four lanes in each direction between the Ockham Park junction and the Painshill junction, except where the A3 crosses over junction 10, which will stay as two lanes in both directions.

The changes would 

  • reduce congestion 
  • smooth the flow of traffic to improve journey times 
  • support economic growth and new housing within the area  
  • improve safety 

We aim to minimise the environmental impacts of the scheme and mitigate the impact the changes have.


Traffic information

Information about scheduled roadworks and events on our motorways and major roads.

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