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Water Calculations

We can provide Water Usage Calculations as required by Local Building Control

Part G water usage calculations undertaken for planning and building regulation compliance.

Part G Water Calculations

Part G of the Building Regulations details sanitation, hot water safety and water efficiency requirements. The water efficiencies section requires all new homes and converted properties to meet new water efficiency requirements to reduce the occupants water usage within the dwelling. The is achieved through the use of efficient sanitary ware, such as dual flush toilets, low flow rate taps and showers, flow restrictors and smaller baths.

Paragraph 36(2)a and b of Part G states that a maximum water usage figure of 125 litres per person per day must be achieved, with an option for the planning authority to apply a reduced target of 110 litres per person per day as part of the planning application. Further more a Part G required a water efficiency calculation is completed and submitted to the relevant Building Control Authority at design and as-built stages. Failure to comply with the target water use figure will adversely affect the SAP rating of a newly created dwelling.

A guide to target water efficiency of fittings

Water FittingMaximum Consumption
W/C6/4 litre dual flush or 4.5 litres single flush
Shower10 l/min
Bath capacity185l
Basin taps 6 l/min
Kitchen taps8 l/min
Dishwasher1.25 l/place setting
Washing machine8.17 l/Kilogram

Full details of the Part G Building Regulations can be found on the Governments website Sanitation, hot water safety and water efficiency: Approved Document G. There are a number of water usage calculators online which enable you to complete the water calculators yourself, however we do find that our clients like to use us to save time and utilise our expertise.


> Water Calculation Required Information

Water Reduction Strategy

Some larger sites require a full water reduction strategy as part of the planning process. This is a more details report demonstrating the water efficiency measures to be utilised on a site wide basis.

Sadler Energy will use our BRE approved Part G water efficiency calculation tools to demonstrate compliance. Not only can we provide all the necessary documentation for your local Building Control officer, but we are also able to provide suitable recommendations to achieve the target water consumption even after the property has been completed.

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