Energy Assessments

Water Efficiency Calculations

MSAFE - Energy Assessments

Calculating your consumption of water

Parts G of the Building Regulations require a water efficiency calculation to be carried out for all new dwellings. The calculation is to show the potential consumption of wholesome water per person per day. The calculations are based on fixtures & fittings in a dwelling and also any grey water or rainwater harvesting technologies that may have been utilised. Each dwelling is required to have a maximum consumption of 125 litres per person per day (l/p/day). 

Your development may even be required to achieve lower usage if built under The Code for Sustainable Homes:

  • Levels 3 & 4 ≤105l/p/day
  • Levels 5 & 6 ≤80l/p/day

MSAFE carry out all Water Calculations in accordance with the Government’s national calculation methodology - The Water Efficiency Calculator for new dwellings.

Contact MSAFE

Health and safety specialists MSAFE undertake work nationwide from our head office in Bournemouth acting as Energy Assessment and EPC advisors covering Dorset, Hampshire, Wiltshire, Bristol, Cardiff, Swansea, Devon, Cornwall, Gloucestershire, Oxfordshire and London.

To arrange a competitive fee proposal, please contact us on 0333 8000 700 or complete our enquiry form and we will contact you to discuss further.


CLC publish SOP Rev.7

Posted 8 Jan 2021

CLC has published their latest Construction Sector - Site Operating Procedures Revision 7 (SOP V7).

What to do if COVID-19 is confirmed on site

Posted 1 Oct 2020

You can plan what action you will need to take if anyone on your site tests positive for COVID-19.

Face covering guidance in construction

Posted 29 Sep 2020

You can download and view the latest update from CLC regarding use of face coverings in construction.

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