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If your development site has a public water main, you might need to make changes to allow your project to move forward. If there's a water main or related equipment on your land, you have the right to request changes or removal to support your development plans, known as a Water Mains Diversion. This right, granted by Section 185 of the WIA91, also applies to adjacent land where water mains might impede progress. Note that building over water mains or related equipment is not allowed.
You can apply for a diversion of an existing water main using our application form, please complete the sections relevant to your development.
At the beginning of the application you will be asked a couple of questions on type of quote and customer to determine the type of application that you need. If you are unsure whether a diversion is required surrounding your works, please apply for a Free Budget Estimate so we can determine this for you.
Our Process & Requirements for Developer Diversions
Developer Diversion Pre-Development Application
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1. Application
Submit your application.
2. Confirmation
We'll confirm we've received everything.
3. Response
We'll send you a response, including map and budget quote.
- Submit your Developer Diversions Pre-Development application on My Development Portal by selecting "I need a Mains Diversion" and selecting the type of quote is Budget Estimate & type of customer is Developer. Please include detailed plans of your proposed works, your AutoCAD plan (in DWG format) including site boundary, Line & Levels during and after works, and any information on trial holes undertaken so that we can determine if a diversion is required.
- We will confirm we have everything needed or request further information to answer your enquiry within 5 calendar days of receiving your application.
- After receiving the full and complete information we will send you a response within 21 calendar days which Includes a map of our apparatus and a budget quote.
Developer Diversion Application
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1. Application
Submit your application.
2. Confirmation
We'll confirm we've received everything.
3. Response
We'll send you the design and cost.
- Submit your Developer Diversions application and payment for fees on My Development Portal by selecting "I need a Mains Diversion" and selecting the type of quote is Detailed Quote & type of customer is Developer. Please include a location map showing the required diversion, your AutoCAD plan (in DWG format) of your works including site boundary, Line & Levels during and after works, and any information on trial holes undertaken.
- We will confirm we have everything needed or request further information to answer your enquiry within 5 calendar days of receiving your application.
- We will send the design and cost within 42 calendar days from receipt of full and complete application.
Developer Diversion Payment & Pre-Construction
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1. Payment or work order
To proceed send your payment or work order.
2. Pre-start meeting
Construction pack will be provided.
3. Programme works
We programme your works.
4. Make the site ready
Make your site ready for a check.
5. Site ready check
We check your site is ready for installation.
- Review and accept your Cost Advice on My Development Portal and make payment.
- After your acceptance and payment is received, a designated Liaison Engineer will be in contact to arrange a prestart meeting where we will discuss our requirements and confirm the installation date.
- Following your pre-start meeting, we will programme your works to be completed within 90 calendar days of payment or later if requested.
- Make your site ready for installation and ensure the relevant machine is available to support with the installation.
- Ahead of the planned installation date of the new water main, we will attend and inspect your site to ensure it is ready for our works.
Developer Diversion Delivery
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1. Lay new water main
We lay the water main.
2. Test and chlorinate
We test & chlorinate the water main.
3. Final connections
We complete final connections and abandonment of existing main.
4. Final walk off
We complete final walk off with all parties.
- We will attend site and carry out our mains laying works.
- The new main will undergo a pressure test and full chlorination.
- Once satisfactory results are obtained, we will attend and complete the final connection and abandonment of the old main.
- On completion of works, a walk off will be completed with all parties.
Our Process & Requirements for Local Authority/Highways Diversions
C3 Highways Diversion Application
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1. Application
Submit your application.
2. Confirmation
We'll confirm we've received everything.
3. Response
We'll send you a response, including map and budget quote.
- Submit your C3 Highways Diversion application on My Development Portal by selecting "I need a Mains Diversion" and selecting the type of quote is Budget Estimate & type of customer is Local Authority. Please include detailed plans of your proposed works, your AutoCAD plan (in DWG format) including site boundary, Line & Levels during and after works, and any information on trial holes undertaken and your letter of authority from Highways so that we can determine if a diversion is required.
- We will confirm we have everything needed or request further information to answer your enquiry within 5 calendar days of receiving your application.
- After receiving the full and complete information we'll send you a response within 28 calendar days which Includes a map of our apparatus and budget quote.
C4 Highways Diversion Application
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1. Application
Submit your application.
2. Confirmation
We'll confirm we've received everything.
3. Response
We'll send you the design and cost.
- Submit your C4 Highways Diversion application on My Development Portal by selecting "I need a Mains Diversion" and selecting the type of quote is Detailed Quote & type of customer is Local Authority. Please include a location map showing the required diversion, your AutoCAD plan (in DWG format) of your works including site boundary, Line & Levels during and after works, and any information on trial holes undertaken, along with a letter of authority from Highways.
- We will confirm we have everything needed or request further information to answer your enquiry within 5 calendar days of receiving your application.
- We will send the design and cost within 35 calendar days from receipt of full and complete application.
C4 Highways Diversion Payment & Pre-Construction
Arrow icon
1. Payment or work order
To proceed send your payment or work order.
2. Pre-start meeting
Construction pack will be provided.
3. Programme works
We programme your works.
4. Make the site ready
Make your site ready for a check.
5. Site ready check
We check your site is ready for installation.
- Review and accept your quotation on the My Development Portal and make payment.
- After your acceptance and payment is received, a designated Liaison Engineer will be in contact to arrange a prestart meeting where we will discuss our requirements and confirm the installation date.
- Following your pre-start meeting, we will programme your works to be completed within 90 calendar days of payment or later if requested.
- Make your site ready for installation and ensure the relevant machine is available to support with the installation.
- Ahead of the planned installation date of the new water main, we will attend and inspect your site to ensure it is ready for our works.
C4 Highways Diversion Delivery & Final Accounting
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1. Lay new water main
We lay the water main.
2. Test and chlorinate
We test & chlorinate the water main.
3. Final connections
We complete final connections and abandonment of existing main.
4. Final walk off
We complete final walk off with all parties.
5. Final account
We will prepare a Final account.
- We will attend site and carry out our mains laying works.
- The new main will undergo a pressure test and full chlorination.
- Once satisfactory results are obtained, we will attend and complete the final connection and abandonment of the old main.
- On completion of works, a walk off will be completed with all parties.
- Following a satisfactory walk off, a final account will then be completed.