Download our calculator

We’ve designed a calculator to help you easily estimate our financial contribution towards new water mains and sewers (the income offset or asset payment). It's a Microsoft Excel-based tool which contains macros, and has been designed to run on a desktop or laptop computer running Excel 2010, or later, on Windows 7, or later. It isn't compatible with mobile devices. We don’t collect any data that you enter into this calculator - it's purely for your use in creating estimates.

We’ve virus-scanned this file using ESET Smart Security (produce version 10.1.235.0 with the virus signature database up to date) but please follow your standard security procedures when downloading from the internet.

This is intended to be a self-service tool to help you with estimating your charges, so please don’t send this file to us. The calculator has built-in instructions and tips to help you use it, but if you have any questions or encounter any issues please do contact us quoting ‘DAD calculator’.

2019/20 charges

Our 2019/20 calculator uses the charges applicable from 1 April 2019 to 31 March 2020.