Water Calculations

Water Calculations – Internal Portable Water Usage

Under current Building Regulations (Approved Doc G), all new dwellings are required to demonstrate a minimum level of water efficiency and produce a water calculation for Building Control handover.

Housebuilders can illustrate compliance through two routes:

either using white goods and sanitary ware which meet individual maximum water usage targets;

or via the calculation method which enables housebuilders to optimise water usage more efficiently as preferred across their appliances.

Local Planning Authorities can also request a higher level of water efficiency which can be demonstrated in the same manner.







Water Calculations take into Consideration:

  • WC’s
  • Taps
  • Washing machines
  • Showers
  • Baths
  • Dishwashers
  • Insinkerators
  • Water Softeners
  • Greywater recycling
  • Rainwater recycling
  • An allowance for external water use
  • Flow rates

SES can carry out your water calculation the following stages as required:

  • Design Calculations– to enable the housebuilder to design and purchase white goods and sanitary ware to submit as part of your planning application.
  • As Built Calculation– to provide to Building Control to satisfy Approved Doc G requirements.

Contact us

If you would like to speak to a member of the team please call 01279 873380 or email enquiries@sestesting.com