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    • Water Efficiency Calculation
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    • Ventilation Test
    • Overheating Assessment
    • SBEM Calculation
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Water Efficiency Calculation for new builds, conversions, and extensions to meet Part G building regulations

Water Efficiency Calculation . Part G

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Water Efficiency Calculations for new-build dwellings and conversions in England​

Water Efficiency Calculations have been a requirement under building regulations since 6th April 2010. Part of Approved Document G, these regulations form part of the UK Government’s strategy to ensure the country is prepared for future climate conditions, including rising average summer temperatures and reduced summer rainfall.

For all new-builds and conversions completed after 6th April 2010, water usage is limited to 125 litres per person per day. Local planning authorities also have the option to reduce this target to 110 litres per person per day if required.

It is good practice to carry out Water Efficiency Calculations at the design stage. Early calculations allow you to check compliance with Part G of the building regulations before installing appliances and fittings, which can significantly affect the outcome. This approach helps avoid costly changes during construction and ensures your property meets regulatory standards from the start.
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Our Water Efficiency Calculations are carried out off-plan, so no site visit is required, providing a fast and efficient service for your project.

If you would like a quote for a Water Efficiency Calculation, please complete the form below...

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Other services you might find useful

Ensure your property is fully compliant with building regulations by checking out our related services:

  • SAP Calculation
  • Air Permeability Test
  • ​Overheating Assessment
  • Sound Test
  • Ventilation Test

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- New Build Dwelling
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Water Efficiency Calculation
Air Permeability Test
Sound Test
​Ventilation Test
​Overheating Assessment
​SBEM Calculation
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