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Water Efficiency Calculations

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Water efficiency calculations predict water consumption in line with Part G of The Building Regulations.

You need these calculations for all new builds, as well as some conversions

What are Water Efficiency Calculations?

The water efficiency of a property is becoming increasingly important to make homes more sustainable. Furthermore, it is important that water is conserved as the population grows.

Water efficiency is measured in litres per person. To comply with Part G of The Building Regulations, a property must show that its water targets will not exceed 125 litres per person per day. Some local authorities will set lower targets, especially in London and the South.

How can L1 Testing help me?

You will need to provide a complete set of floor plans showing the number of ‘wet rooms’ such as the kitchen, utilities and bathrooms in order for us to provide these calculations . In addition, the plans will also need to show the number of facilities which will use water, such as showers, toilets, sinks, washing machines or dishwashers.

We will then calculate the projected water consumption levels of your home. Generally, you’ll carry out water efficiency calculations at design stage, as part of your SAP calculations. However, your local authority may need these measurements at any point in your project.

We are here to help you pass your regulations in a timely, stress-free manner. Fortunately, these calculations are quick to carry out. So you can expect a fast turnaround thanks to our expert team of assessors.

We can help!

We will guide you through the entire process. Free advice and support is included in our service to make sure that your project passes.

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