M25 junction 10/A3 Wisley interchange improvement

Project information

Latest update - 23 January 2023

The Secretary of State has made a Correction Order (PDF, 46 KB) affecting the M25 Junction 10 / A3 Wisley development. A Correction Notice (PDF, 104KB) was issued on 20 January 2023. The Correction was made following a request from The Applicant’s solicitor BDB Pitmans LLP on 20 June 2022  (PDF, 160 KB).

View all updates.

About the project

Type of application: Highways

Name of applicant: Highways England

In December 2014 the Department for Transport (DfT) published the Road Investment Strategy (RIS) for 2015-2020. The RIS sets out the list of schemes that are to be delivered by Highways England over the period covered by the RIS (2015 – 2020). The RIS identifies improvements to M25 J10/A3 Wisley Interchange as one of the key investments in the SRN for the London and South East region. The proposed improvements being as follows: “improvement of the Wisley interchange to allow free-flowing movement in all directions, together with improvements to the neighbouring Painshill interchange on the A3 to improve safety and congestion across the two sites”.

Project stage

This project is at the post-decision stage.

This application was granted on 12 May 2022.


This is where the applicant starts to create their application. The applicant is required to consult with people and organisations in the area. They must also create detailed documents about the impact the project could have on the environment.

It is important to get involved at this stage to influence the application before the applicant sends it to the Planning Inspectorate.

Find out what you can do at this stage and check our detailed guides.


This is when the applicant sends us their application documents. We check if we can accept the application for examination. We have 28 days to make this decision.

How the acceptance stage works and what happens next.


The Examining Authority is appointed and is made up of one or more inspectors. Anyone who wants to have their say needs to register at this stage.

The applicant must publish that the application has been accepted by us. They include when and how parties can register to get involved. The time period for registering is set by the applicant but must be no less than 28 days.

The pre-examination stage usually takes about 3 months.

What happens during the pre-examination stage.


The Examining Authority will ask questions about the proposed development. The applicant and anyone who has registered to have their say can get involved and submit comments at each deadline in the timetable. You can also attend hearings that may take place. This stage takes up to 6 months.

What happens at the examination stage?


The Examining Authority writes its recommendation report. This must be completed and sent to the relevant Secretary of State within 3 months of the end of examination stage.

Making a recommendation.


The decision stage is when the relevant Secretary of State then reviews the report and makes the final decision. They have 3 months to make a decision.

Who makes the final decision.

What happens after the decision is made

Once the Secretary of State has made a decision, there is a 6 week period where people can challenge the decision in the high court. This is called a judicial review.

What you can do after the decision has been made.

Project location

M25 Junction 10, near Wisley, Surrey and A3 between Cobham/Byfleet and Ripley/Ockham.

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