Fringe Box



Delays to M25 Junction 10 Scheme Cause Costs to Jump 25%

Published on: 27 May, 2022
Updated on: 27 May, 2022

By Hugh Coakley

National Highways has revealed the lastest cost for the controversial scheme for improving the M25 junction with the A3 has risen to “a maximum of £317 million”, a 27 per cent increase on the expected cost in November 2017 of between £100 million to £250 million.

Reasons given were delays approving the scheme, inflation increases and other market forces over the last 18 months.

Aerial view of junction 10 on the M25.

Programme manager for National Highways, Simon Elliott said the additional funds will come from National Highways Road Investment Strategy budget.

He said: “While the cost has increased, the money spent on this scheme is comparable with other major projects of similar complexity and still delivers best value for money for the taxpayer.”

Cllr Colin Cross

But opponents to the scheme were skeptical about the cost estimate.

County and borough councillor, Colin Cross (R4GV) said: “I don’t think that the costing is accurate; think £350 to £400 million”.

Tony Edwards, spokesperson for the Wisley Action Group, also believed the costs would go even higher saying: “with expectation of still higher inflation, particularly in building materials, the figure looks likely to top £400 million”.

See £250 Million M25 Junction 10 Improvement Project Gets Approval To Start (May 2022) 

The government had delayed approving the scheme three times since the original expected decision date in January 2021. But this delay has given the contractors, Balfour Beatty and Atkins, time to plan the works with construction work due to start in just over three months in September 2022.

The project is planned to be completed by Summer 2025.

The contractor will be building the site compound at Nutberry Fruit Farm starting next month with their other compound at Wisley Airfield in July. Site surveys to establish the location of utilities will continue and there will be utility diversions at both Ockham interchange and Painshill junction requiring traffic management.

There will be a series of a series of online briefing sessions and face-to-face events in June.

Guildford Town Centre, outside the Friary Centre Sunday 26 June, 10:00 – 16:00
Woking Jubilee Square, next to the town gates Monday 27 June, 10:00 – 16:00
Sainsburys, Cobham Tuesday 28 June, 10:00 – 16:00
RHS Wisley car park Wednesday 29 June, 10:00 – 16:00
Ripley Village Hall Thursday 30 June, 15:00 – 20:00

Online sessions led by the M25 J10 team and bookable by  email on, are as follows:

Environmental briefing: join us to find out more about our environmental improvements Monday 13 June, 14:00 – 15:30

Tuesday 14 June 10:00 – 11:30

Non-motorised users briefing: join us to find out more about the improvements we will make to local footpaths, bridleways, and cycle routes Tuesday 14 June 13:00 – 14:30

Wednesday 15 June at 11:00 – 12:30

Business briefing: join us to find out more about how our proposals will support the local area and how we will communicate our works with you Wednesday 15 June 14:00 – 15:30

Monday 20 June at 11:00 – 12:30

General briefing: join us for an overview of the scheme and our works Monday 20 June 19:00 – 20:30

Thursday 23 June 10:00 – 11:30

Share This Post

test One Response to Delays to M25 Junction 10 Scheme Cause Costs to Jump 25%

  1. Bibhas Neogi Reply

    May 27, 2022 at 1:21 pm

    Now that the cost is likely to increase even more as mentioned by Cllr Colin Cross, should there be a pause and a re-think on this scheme?

    We know big company names in the road-building are involved but that does not necessarily mean they have found the optimum solution. They had explored 21 Options and chose the elongated roundabout as their solution. I wrote to Highways England back in March/April 2021 and asked them to explore an option they had not while they waited for the SoS consent.

    I admit it was late in the day to explore a new option but considering its potential savings in costs (£50m or more) as well as it being a safer option, should it not be looked at? This option would have kept the M25 off-slips and the A3 on-slips traffic separated rather than mixing on the roundabout. It also would have reduced traffic disruptions and traffic management costs quite considerably.

    I have mentioned in my comments the advantages before of this option here in TGDN. Please see

    I may be just one person raising these issues of safety and costs while National Highways progress with a scheme that is likely to be not the best that could be achieved.

Leave a Comment

Your email address will not be published.