DISCLAIMER: Before completing the application form, we strongly advise you read through the diversions webpage to ensure that you provide the required information. Failure to provide all required information could cause delays to your application.

Gas diversions

There are pipelines all over the country that help transport gas safely.  Our pipeline covers 82,000 miles placed end to end, and makes the supply of vital resources to homes and businesses simple for those needing them. However, our network of pipelines can often be affected by work that needs to be carried out nearby.

It is important for safety reasons that you let us know about your planned works well in advance, as the new location of a diverted pipe will need to comply with proximity rules and other safety policies.

If you are unsure whether our assets are within the area of your works, please submit a 'Dial before you dig' enquiry. If our assets are identified within your area of works, please contact us on 0800 0745 788 or at diversions@cadentgas.com to determine if a diversion is required.

When you’re doing any sort of excavation work, from building a small conservatory through to things like road and motorway work or the building of new houses, the diversion of gas pipes may be a necessity. Here, we’ll cover some more information around gas diversions.

Get started

Here are the steps that we will take you through during the diversions process. Don't worry, we’ll stay in touch along the way to make sure it's going smoothly and you’re happy with everything.
  • Submit your diversion request

    Please ensure you submit as much detail as possible including new lines and levels of site, any development proposals, or any hazards we should be aware of.

  • Survey carried out

    If required, we will meet you on site as soon as possible to discuss your plans and requirements

  • Receiving your estimate and making payment

    If you requested a C3 estimate, you will need to let us know if you wish to progress to a C4

  • Works carried out

    the work will have to be tendered and awarded to a Local Delivery Partner (LDP) which are management by our Construction Management Organisation (CMO). A date for the diversion will be advised taking into account resource avaibility and any restrictions such as Highway Permits.

  • Works complete

    Once we're finished the area will be reinstated and final accounts submitted.

Types of applications

C2 (preliminary enquiries): The utility companies are required to supply information regarding the general position and nature of apparatus from their records and draw attention to any limitations in the quality of this information. If you have a query about the location of our assets please email our plant protection team plantprotection@cadentgas.com

C3 (initial design and budget estimates): requests for initial budget cost estimation are submitted to the utility companies along with preliminary project designs. this includes the extent of the proposed works with potential diversion routes indicated for existing apparatus (ie, mitigation measures) and budget estimates of the measures (as assessed at preliminary design stage).

C4 (detailed design and estimates): requests for detailed estimates are submitted to utility companies along with final design details of the proposed project, working drawings and an outline programme. Stage C4 is a very important stage as it establishes in detail what the necessary utility mitigation measures are, who they are to be undertaken by and form the basis of the Official Works Order.As of April 1st 2021 C4 requests are now covered by our Guaranteed Standards of Performance. For more information please visit https://www.ofgem.gov.uk


How do gas diversions work?

A gas diversion is carried out to do exactly what you'd expect: diverting part of the gas pipeline away from its current route in order to facilitate safe working.  Any gas pipe that is tampered with represents a hazard as it can easily ignite and cause an explosion.
The route of underground gas pipes can be unclear, especially as pipes don’t always travel in a straight line and can change direction.
 Before carrying out any work whatsoever, it’s important that you contact us to let us know about your planned works and find out whether a gas diversion needs to be put in place. Before contacting our diversions team, you’ll need to know:

  • Site information
  • Design proposals

Once our team have assessed your plans, someone will be in touch to discuss in further detail. If we do decide that a gas pipe diversion is necessary, this may also involve a site visit to ascertain in further detail what work needs to be carried out.

How long will a gas diversion take?

There’s no definitive way to say how long a gas diversion will take due to the complex nature of a diversions project and the fact that some require much more time than others. The amount of time we’ll need to assess, plan and carry out any necessary work depends on the scale of the development and amount of pipework that needs to be moved.

It’s vital that the plans you submit from the start are as accurate as possible so there are no unforeseen delays to the diversions process.


What is a Diversion?
What is the process of a diversion?
Who do I contact for queries/to make any changes?
How does a site visit work?
What is a C3 and C4 quote?
What's a service?
What's a main?
What's a rise?
What contributes to the price and timescales of the diversion?

More information

If you’d like more information about diversions or are unsure whether you need one, you can speak to our Connections Team on 0800 0745 788.

Do you have a diversion enquiry?

Contact us: 
Email: Diversions@cadentgas.com
Phone: 0330 678 1034