Water Efficiency Calculations

At One Stop Consult, we provide water efficiency calculations that comply with Part G of The Building Regulations, predicting water consumption for both new builds and conversions. As sustainability becomes increasingly important in the building industry, it is crucial to ensure that the water usage of a property is carefully considered. With a growing population, water conservation is more important than ever.

The water efficiency of a property is measured in litres per person, and in order to comply with Part G of The Building Regulations, a property must demonstrate that its water targets will not exceed 125 litres per person per day. However, certain local authorities, particularly those in London and the South, may set even lower targets. For further information regarding these regulations, please visit our section on The London Plan.

To provide water efficiency calculations, you or your architect will need to provide One Stop Consult with a complete set of floor plans that show the number of ‘wet rooms’ such as kitchens, bathrooms, and utilities. Additionally, the plans must show the number of facilities that will use water, including showers, toilets, sinks, washing machines or dishwashers.

Using this information, One Stop Consult will calculate the projected water consumption levels of your property in line with Part G of The Building Regulations. Typically, water efficiency calculations are carried out during the design stage as part of SAP Calculations. However, it is possible that your local authority may require these calculations at any stage of your project.

One Stop Consult can arrange water efficiency calculations within 5-10 working days from when you contact our team. Once we have assessed the information you provide, we will analyze the data and present our findings in a formal report.