Guidance

The water efficiency calculator for new dwellings

Details of the water calculation methodology for assessing the 'whole-house' water efficiency of new dwellings.

Documents

The water efficiency calculator for new dwellings: guidance

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The water efficiency calculator for new dwellings

This file may not be suitable for users of assistive technology. Request a different format.

If you use assistive technology and need a version of this document in a more accessible format, please email alternativeformats@communities.gsi.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Detail

This document sets out the water calculation methodology for assessing the ‘whole-house’ water efficiency of new dwellings. The water calculator tool (Excel spreadsheet) is also available here to download.

The calculation method is to be used to assess compliance against the water performance targets in building regulations 17 K. The code for sustainable homes now uses this calculator as the assessment methodology for WAT1.