M25 junction 28 improvements

Upgrading junction 28 of the M25 between the M25 and the A12 in Essex.

Start date 2022
End date 2025
Cost £140 million to £170 million

Latest updates

  • 23 November 2023

    M25 anti-clockwise entry slip road overnight closures

    To allow us to safely carry out work to remove lighting columns, we’ll be closing the anti-clockwise entry slip at junction 28 on Monday 4 and Tuesday 5 December from 10pm to 5am each night.

    To join the M25 anti-clockwise during the closure, use the M25 clockwise to travel to junction 29, where you’ll be able to continue your journey.

  • 08 November 2023

    Scheme achieves two big milestones

    The first saw six 70-metre beams moved into place within our site between the M25 and A12 for the Grove Bridge – as our first lift, this is a significant milestone for the scheme. These beams form the base of the Grove Bridge road deck, which will carry the new loop road underneath the Maylands Bridge – the new A12 eastbound exit that is currently being constructed.

    The beams were lifted into place in pairs using two specialist mobile cranes, known as modular transporters, due to overhead cables.

    M25 junction 28 Beam lift

    With a crane positioned on the M25-anticlockwise carriageway over two nights, we also moved eight large concrete blocks into place. These pre-made rectangular sections will form the new Weald Brook culvert, which will help divert the brook so we can widen the M25 entry slip road. And the good news – this lift was completed ahead of schedule, and we were able to reopen the M25 for traffic early on Sunday morning.

    Scheme rated as excellent

    Our project has once again achieved top marks and rated ‘excellent’ by the Considerate Constructors Scheme (CCS).

    CCS is an independent organisation that aims to raise standards within the construction industry by promoting and supporting construction schemes in their efforts to care for the environment, local community, and their workforce.

    Following our most recent visit by the independent assessor, the project gained top marks in all three categories – Respect the Community, Care for the Environment and Value the Workforce – and once again scored a maximum score of 45/45.

    The assessor praised the project for: “…continuing to conform to the CCS Code of Considerate Practice to an excellent standard. Community communication and support arrangements remain very comprehensive and appearance standards are very high. It is great to see the progress in the site's social value plans and the wide range of community support and engagement activities that have been undertaken to date.”

    Project manager Zach said: “I’m delighted that we’ve once again achieved top scores across the board from the Considerate Constructor Scheme. And having just achieved our first bridge lift – a significant milestone for the project – it’s great recognition of all the hard work that everyone is putting in to deliver this project safely, with consideration to those around us, road users and the environment.”

    M25 junction 28 - CCS score November 2023

  • 25 October 2023

    Weald Brook culvert installation

    Work on site is progressing well and we’re now getting ready to lift the new Weald Brook culvert into place. Constructed using hollow pre-made concrete sections, the culvert will help divert the brook so we can widen the M25 entry slip road.

    Due to the brook being so close to the carriageway, we’ll need to close the M25 anti-clockwise between junctions 29 and 27 for a couple of nights while we use a crane to move the culvert sections into place.

    We understand that closures are frustrating, so we appreciate everyone’s patience as we work to improve this busy junction.

    Closure information

    The M25 anti-clockwise will be closed between junctions 29 and 27 on Friday 3 and Saturday 4 November from 10pm to 7am each night.

    A diversion will be in place via the A127, A406 and M11.

    Road users travelling into ULEZ during the closures, won’t be charged if they stay on the official diversion route.  It’s important that road users follow the diversion route signage and not to stray off the official route because of suggested alternatives from a Sat Nav. For more information about ULEZ and charges, visit TfL’s webpage.

    In the community

    It was ‘on your marks…set…bake’ on site recently, all in the name of charity.

    With rewards handed out for star baker, and the best faker, the team enjoyed a well-earned coffee and cake break as part of the nationwide Macmillan Coffee Morning.

    And following the fundraising efforts of the health and safety advisor, who has been undertaking a series of hikes and other events in memory of a close friend, the team have raised a whooping £1,500 for Macmillan – well done everyone.

    Macmillan coffee morning Sept 23

    Stamp it out!

    You may have noticed some new signs around where we’re working. Part of the industry-wide Stamp it Out campaign, the signs make clear that we do not tolerate abuse towards anyone working on our site.

    Sadly, abuse is an ongoing issue within the construction industry; protecting our workforce is our number one priority.

    Stamp it out sign

  • 05 October 2023

    Progress update – October 2023

    It’s been a busy year since we started our improvements at junction 28, from archaeological finds and tunnel boring machines, to giving fish a new home and secret animal highways.

    And if you’ve passed through the junction, you may have seen quite a few changes to the landscape alongside the road. So far, we’ve moved approximately 100,000m3 of earth – enough to fill 40 Olympic sized swimming pools – as we prepare for the new two-lane loop road that will link the M25 to the A12.

    We also recently closed a lane on the anti-clockwise entry slip so we can start on the new slip road.

    You may have spotted some tall piling machines on site. These are specialist drilling rigs laying the foundation for four new bridges that will carry the loop road – Alderwood, Duckwood, Grove and Maylands.

    Let’s look at how each one is progressing, along with some of the other key structures on site:

    Alderwood Bridge

    We’ve completed the foundations for the Alderwood Bridge, located adjacent to the M25, and work has started on the concrete supports, known as abutments, that will carry the raised road deck.

    Later this year, 16 precast concrete beams will be lifted into place. These beams will sit on the abutments, spanning the gap and forming the base of the road deck. Each beam measures 23.5 metres in length – around the same as two double decker buses – and weighs approximately 35 tonnes – that’s five fully grown African elephants!

    Alderwood bridge under construction

    Grove Farm culvert

    Standing proudly within our site, the Grove Farm culvert is starting to take shape. Made up of precast sections, lifted into place by crane, the culvert will soon become integrated into the landscape as earth is landscaped around it. Once complete, local landowners will be able to use this to pass under the new loop road.

    Grove Farm culvert under construction

    Maylands Bridge

    You may have noticed some columns starting to rise out of the ground near the A12. These impressive structures will support the Maylands Bridge, which will carry the new A12 eastbound exit slip.

    Maylands bridge under construction

    Grove Brook culvert

    Our work to extend the Grove Brook culvert is progressing well with over half of the precast concrete units now in place. The culvert will take the Grove Brook under the new A12 eastbound exit slip. It also has a secret ‘highway’ for animals – the mammal shelf hidden within the culvert allows wildlife, such as water voles and otters, to safely travel under the road without getting their feet wet. You can just see it on the right of the concrete boxes.

    Grove Brook culvert under construction

    Duckwood and Grove bridges

    We’ve finished the foundations for the Duckwood and Grove bridges, and are now constructing the next layer – the bases for the concrete abutments.

    Six steel beams recently arrived on site, and these will be lifted into place to form the base of the Grove Bridge road deck later this year. 

    Weald Brook culvert

    We’ll soon be installing the new culvert for the Weald Brook. Located close to the M25, this culvert will help divert the brook so we can widen the M25 entry slip.

    To help us get the culvert into place, you may notice two large cranes arriving on site. Keep an eye on this webpage for more information.

  • 02 October 2023

    Start of construction on the new M25 anti-clockwise entry slip

    Excellent progress has been made across the scheme since we started work last October.

    We’ve now moved to the next phase of the project, the construction of the new M25 anti-clockwise entry slip. To do this safely and minimise disruption for drivers, we’ve closed a lane on the existing anti-clockwise entry slip at junction 28 until early 2025.

    The lane closure will allow us to build the new entry slip, as well as the bridge that will carry the A12 loop road over the new slip road.

    By closing a lane for a solid block of time, we can complete most of our work on this essential part of the scheme while keeping a lane open to traffic.

    Want to know more? Come and meet the team

    We’ll be at the Holiday Inn Brentwood on Tuesday 3 October from 10am to midday, and again 5pm to 7pm – please pop in and see us if you have any queries about the scheme. The Holiday Inn can be found on Brook Street, Brentwood, CM14 5NF. There is free parking on site.

    If you can't make it and you'd like to speak to someone, you can call our contact centre on 0300 123 5000 (open 24/7), who will pass your query on to the team or email us at M25j28@nationalhighways.co.uk.

  • 10 July 2023

    Earthworks update – July 2023

    You might have seen some changes to the landscape if you have been travelling through the M25 junction 28 junction or along the A12 recently, as we continue to make excellent progress with our earthworks to prepare the area for the new two-lane loop road.

    We have up to 16 bulldozers, excavators, tippers, and other machines working to move and place approximately 130,000m3 of earth (if that much earth were water it would fill 52 Olympic sized swimming pools!). We must move this earth while the weather’s dry and it’s a vital part of the whole project.

    We are pleased with progress on the new Alderwood Bridge, near the M25, where we’re using a specialist drilling rig to install foundations, posts and walls. The drill digs down into the soil to create a hole that is then filled with concrete, known as a

    Work is now underway to dig out the earth around the piles and clean them ahead of the next phase of works. When completed Alderwood bridge will carry the new A12 loop road and allow the new M25 entry slip to pass beneath the loop road.



  • 05 May 2023

    A12 lane closures

    Before we can start on the new A12 exit slip, we’re working with utilities companies to move pipes and cables out of the area. To make sure this work can be carried out safely, there will be a lane closure on the A12 eastbound between Petersfield Avenue and the A12 slip road for M25 junction 28, with one lane remaining open, between:

    • 5am Tuesday 2 May and 8pm Friday 5 May
    • 5am Tuesday 9 May and 8pm Friday 12 May
    • 5am Monday 15 May and 8pm Friday 19 May
    • 5am Monday 22 May and 8pm Friday 26 May
    • 5am Tuesday 30 May and 8pm Friday 2 June

    Scheme gains top marks

    Our project to reduce congestion and increase capacity at the busy M25 junction 28, has been awarded top marks and rated excellent by the Considerate Constructors Scheme (CCS) – an independent organisation that aims to raise standards within the construction industry.

    CCS promotes and supports construction schemes in their efforts to care for the environment, local community and their workforce.

    Gaining 45/45 on our first assessment, the auditor commented: “The project is conforming to the CCS Code of Considerate Practice to an excellent standard. Community communication and support arrangements are extremely comprehensive and appearance standards are very high. It is excellent to see the site's social value plans and achievements to date”.

    Following the review, project manager Zach said: “We’re thrilled to have received excellent across the board on our first assessment. It’s not just about getting top scores, these visits also allow us to gain valuable feedback from someone seeing the site and our activities with fresh eyes.”

    Come and meet the project team

    The project team have a drop-in clinic, which is a great way for local residents, businesses and other stakeholders to meet members of the team.

    If you have got a question about the scheme or are interested to see what it will look like when our works are finished, then please visit or next drop-in and we will be happy to answer any questions you may have.

    The team will be on hand at the Holiday Inn Brentwood on Tuesday 16 May between 4pm and 7pm.

    The Holiday Inn can be found on Brook Street, Brentwood, CM14 5NF. There is free parking on site, so please come along and say hello.

    If you can’t make it and have a question, you can email us on m25j28@nationalhighways.co.uk or call 0300 123 5000, and one of the team will be happy to help.

  • 24 April 2023

    Project update – April 2023

    You may have been wondering how we’re getting on with our improvements behind the hoardings…here’s a little update for you…

    Even with the challenging weather, we’ve made great progress since the start of the year.

    Laying foundations

    There have been several tall machines dominating the skyline of the site which have been doing an important job laying foundations – these are piling machines.

    Piling is a common construction technique that uses a specialist drilling rig to install foundations, posts and walls. The drill digs down into the soil to create a hole that is then filled with concrete, known as a pile. A row of these ‘piles’ create your foundations or walls.

    So far, we’ve installed 133 continuous flight auger (CFA) piles that will form the foundations for the new Alderwood Bridge, which is located adjacent to the M25. CFA piling involves drilling and pouring concrete in one continuous action, which is enabling faster installation time than installing traditional bored piles. CFA piling is also one of the quietest methods of piling and is virtually vibration free.

    We’ve also installed 1,480 piles to form the foundations for the new Maylands and Duckwood Bridges, ahead of construction work starting.

    We’ve not just been busy on site, we’ve also precast 16 concrete beams offsite that will be used to construct the Alderwood Bridge. Each beam measures 23.5 metres in length, the same as two double decker buses bumper to bumper, and weights approximately 35 tonnes, which is almost 16 fully grown hippos!

    Progress on junction 28

    Moving and protecting the existing service pipes and cables

    Before we start any construction, we’ve been working to move or protect the service pipes or cable that run through the site. This will protect them from getting damaged and ensure they can be easily accessed for maintenance and repairs in the future.

    So far, we’ve moved a gas main and the National Roads Telecommunications Services (NRTS) cables on the M25, and installed a special protective cover around a fuel line. The new route of the gas main is being further protected by a thick layer of reinforced concrete – this is concrete that has a steel frame cast within it to provide additional strength and support.

    New ponds and drainage

    We’ve dug out one of the three ponds to be created on the scheme. When completed these ponds will hold excess surface water in the future to prevent localised flooding and support local wildlife.

    Additionally, we’ve installed more than 75 metres new drainage pipes, dug new ditches and filter drains to prevent groundwater entering the work area.

    Progress at junction 28

    What’s coming up

    Following the completion of drainage works, the focus will shift towards shaping the site.

    This will involve the movement of approximately 130,000m3 of earth around the site, that’s enough to fill 52 Olympic-sized swimming pools, and you’ll soon see what the final shape of the area will be. As part of this, we’ll also be diverting Weald Brook, and starting on the foundations for Maylands Bridge and Grove Bridge.

    This type of earthworks requires careful planning and coordination to ensure the work is carried out safely and efficiently.

    You may also notice new deer fencing being installed around the edge of the site, to ensure the safety of both drivers and wildlife in the area.


  • 24 November 2022

    Our tunnel boring machine is ‘Simply the Best’

    Pupils from the nearby Drapers Maylands Primary School have helped us to launch our Tunnel Boring Machine (TBM) – Tina Turney.

    Meet our tunnel boring machine - Tina Turney

    The machine, which will be used to dig the new route of a gas main that’s being diverted as part of our improvements, recently arrived on site, and the pupils were there to meet her.

    TBMs are traditionally given female names for luck, and a few weeks ago, the pupils had been challenged with the important job of coming up with a name for our machine.

    The winner was Maanya, who came up with the name Turney, which was soon nicknamed Tina Turney.

    The 44 year 5 and 6 pupils have been learning about tunnelling and our work at junction 28 from the team, as well as why engineering is such a vital job and the importance of site safety.

    We look forward to keeping the students up to date with Tina’s progress, we might even inspire some future engineers or tunnellers.

    Planned streetlighting upgrades

    Our maintenance teams will soon be introducing new LED streetlights at the junction. This work will take place overnight between late October 2022 and early March 2023, allowing us to share workspace and reduce the overall number of closures we’ll both need.

    Much of the work on the roundabout will be carried out safely within lane closures, but we'll need some total closures of the M25 slip roads. More information about this work is available on our south east maintenance page. 

  • 16 May 2022

    Development Consent Order given the green light

    Today we welcomed the Secretary of State for Transport decision to grant us a Development Consent Order, which allows us to proceed with our proposals to improve the M25 junction 28.

    At peak times up to 7,500 vehicles per hour pass through this heavily used junction, resulting in queues and delays. Improving the flow of traffic around this junction and allowing more capacity on the exit slip roads, will provide a safer and more integrated network for everyone. There will also be less likelihood of traffic queuing back onto the M25 due to the reconfiguration of the junction.

    Thank you to everyone for their engagement and contribution in the development of the scheme to date.

    To make sure you know what’s coming up, sign up to our project newsletter using the sign-up link below, we’ll also be providing regular updates on this page.

    You can view more information about the decision on the Planning Inspectorate website.

    Keeping you informed

    We plan to start preparation work this summer, with main construction starting this autumn. To make sure you know what’s coming, and to keep everyone up to date, we will:

    • issue regular project newsletters – you can join the mailing list by signing up on this page
    • run online briefings in summer 2022 to provide the opportunity to ask the team any questions
    • organise face-to-face events using our engagement van at local venues. These will provide information about the scheme and allow us to answer any questions you and others may have. We will provide you with more details of these on this page soon.

  • 01 July 2020

    Application for Development Consent Order

    Our proposals for the M25 junction 28 improvement scheme are the subject of an application for a Development Consent Order (DCO). We are applying for a DCO to give us the planning permission and legal powers we need to build the scheme. We have submitted our application to the Planning Inspectorate, the government agency responsible for operating the planning process for DCOs. Our DCO application was accepted by the Planning Inspectorate on 24 June 2020 for formal examination.

    You can view our application on the Planning Inspectorate website.

Project information


The M25 junction 28 plays a huge role in connecting the A12 and the M25, as well as providing access to Brentwood via the A1023. Up to 7,500 vehicles pass through the junction roundabout at peak times.

As it is operating at capacity, vehicles using the junction face congestion and delays, which effects local air quality. Our research shows that traffic is expected to increase in the area by around 30% by 2037, which means that over 9,000 vehicles could be passing through it by this date.

Our improvements include:

  • building a new two-lane loop road, for traffic travelling from the M25 anti-clockwise onto the A12 eastbound (towards Brentwood). This will include the construction of new bridges to take the loop road over or under the other road links, and the Weald Brook; new signage and changes to the landscape
  • changing the position of A12 eastbound exit slip road and M25 anti-clockwise entry slip road to allow for the new loop road
  • widening the M25 anti-clockwise carriageway to provide more space for traffic leaving for the A12 eastbound

To find out more about our scheme visit our information portal.

Our improvement scheme will:

  • Increase capacity and reduce congestion at the junction and on the approaches and exits
  • Improve safety by redesigning the existing roundabout layout and reducing traffic levels
  • Provide better connections between the M25 and A12
  • Reduce annual collision rates through additional capacity
  • Improve average journey times and reliability for all passing traffic through the junction
  • Minimise the impact of air and noise pollution in the local area by smoothing the traffic flow
  • Reduce traffic queuing back onto the M25
  • Help economic growth in the area by providing improvements to cater for future traffic demands

Our improvements at junction 28 on the M25 look to provide safer and smoother journeys for everyone as they make their way through the junction. This includes non-motorised users, also known as NMUs, such as pedestrians and cyclists.

We’re currently working on our final plans for our upgrades to the NMU route, which includes ways to improve the crossing on the clockwise entry slip.

We’ll share our plans for a more integrated and accessible junction here when they are ready.

Visit our M25 Junction 28 feedback tool to have your say. The tool includes an interactive map. You can click on a location to make a specific comment, or give us your general feedback.

ECHO is a one-way feedback tool, so if you’d like a response to your feedback you should email the project team at: m25j28@nationalhighways.co.uk

Map of the area covered by the M25 junction 28 scheme


The Development Consent Order (DCO) process was established by the Planning Act 2008 and is used for certain large and complex schemes (including highway improvements) that have been designated as a Nationally Significant Infrastructure Project (NSIP) by the Government.

The Secretary of State for Transport granted the Development Consent Order (DCO) for the M25 junction 28 improvements on 16 May 2022. Links to key DCO documentation can be found below:

You can view our full Development Consent Order application on the Planning Inspectorate website.

This includes documents identified under Article 43 and Schedule 9 of our Development Consent Order, which have been certified as true copies by the Secretary of State.

Development Consent Order – Requirements Register

Requirements are conditions that have been included in the DCO, which control how the project must be implemented (constructed and maintained). Implementing the DCO in accordance with these conditions involves completing consultation and approval processes that have been defined in the DCO. These processes are referred to here and in the DCO as “discharging” the requirements.

This Requirements Register is a live document and will be updated as the process to discharge the requirements progresses.

The latest version will always be published below:

View the Requirements Register.

This register will be maintained for three years following completion of the project. The register sets out:

  • each requirement
  • whether the requirement needs approval by the Secretary of State (or other duty holder)
  • whether any approval has been applied for or given

Requirements documents

Traffic information

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

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