This British Standard gives recommendations for calculating the volume of public mains water that is consumed for domestic use in non-domestic buildings. It gives recommendations for estimating the total water use from the buildings’ components, allowing consumption to be indicated on a whole building level against other buildings for best practice levels.
This standard is not for use as a design guide.
It provides a framework for and details the development of water use calculation methodologies in non-domestic buildings. It provides recommendations for the quality of data used to calculate water use for each component in non-domestic buildings and also standardized reporting for product performance data.
It applies to both new and existing buildings and covers:
Water that is sourced from unwholesome sources such as rainwater harvesting systems or greywater reuse systems;and
Water that is sourced from wholesome sources including both hot and cold water.