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Contact Developer Services

If you’d like to get in touch, we have a dedicated help desk to answer your questions and offer advice.

If you’re calling about an application, please have your DS reference number handy, so we can help you as quickly as we can.

A Thames Water rep speaking on the phone

Call us

You can call us on 0800 009 3921. Our lines are open from 8am to 5pm, Monday to Friday. We're closed on bank holidays.

If your hearing or speech is impaired, you can contact us using RelayUK.

Contact us online

Contact us online

Write to us

Thames Water
Developer Services
Clearwater Court
Vastern Road


We try our best to get things right first time. However, we realise that we occasionally don’t achieve the high standards we set ourselves.

If you’re concerned about any aspect of our service, please call us on the number above to discuss the matter.