Builder or Architect

As a Builder or Architect working on domestic properties or building a new home, we have a number of services to meet your needs.

Before making an application, understanding where our sewer and water mains are located around your site is an important step to inform your options, as you may need to divert, build near to or over them. Our sewer and water maps are available to purchase and view online.

You can find information about our different applications below and each of our application webpages takes you through the steps the application will take and the documents you would need to submit.


Building a new home or commercial building

When building a new home or commercial building you will most likely need a new water supply and sewer connection. We can help you connect through our water connection and sewer connection applications.

If your site is not close enough to our existing sewer or water mains, then you may need to organise laying a new pipe. If this is through third party land, we would need a copy of the landowner’s permission.


Building a new extension

When working on new extensions, you need to ensure there aren’t any existing sewer pipes which will be impacted by the site plans. If the proposals mean building over or within 3 metres of our public sewers or lateral drains you will need to let us know through a Build Over application to ensure we are happy our pipes are protected and accessible in the future.

Alternatively, you might look to divert one of our sewer or water mains. Minor sewer diversions (a sewer < 225mm in diameter and < 3.0m deep) can be applied for under a Build Over application. For larger or deeper sewers, these can be diverted through a Developer Sewer Diversion (Where you can design and carry out the diversion work with our approval) or a Southern Water Sewer Diversion (Where we carry out the design and diversion work). The only option for water main diversions is for them to be carried out by us.


Build over a sewer

Guidance on building over or close to a public sewer.

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Sewer connection

Guidance on connecting to a public sewer main.

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Water connection

Guidance on connecting to a public water main.

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Sewer diversion

Guidance to divert an exisiting sewer main yourself or through us.

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Water main diversion

Guidance to divert an existing water main.

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