Part G Water Efficiency Calculations

What is a water calculation?

Current building regulations (Part G) require a maximum water usage of 125 litres per person per day using the governments standard water usage factors.

Using project drawings and specifications we will undertake a desktop appraisal of the dwelling and water usage fittings within. These will include, basins, toilets, showers, baths, washing machines, dishwasher, water softeners, waste disposal units, grey and rain water recycling systems.

 

Once our team of assessors have calculated the usage based on the design drawings and specification they will provide a report for each dwelling. This is will be required by your building control officer , warranty or NHBC for final certification. However, don’t leave it until the end of the project to comply, as replacing any fixtures or fittings can be needlessly expensive.

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What are the requirements?

For new build properties the maximum allowable for water usage is 125 litres per person per day. However many planning authorities require this to be lower in an effort to help with reducing overall water consumption and demand on the main water supplies. Below is a guide to some common requirements:-

Common Requirements
Internal Usage
External Usage
Total Usage
Building Regulations
120.00
5.00
125.00
Code Level 1/2
120.00
5.00
125.00
Code Level 3/4
105.00
5.00
110.00
Code Level 5/6
80.00
5.00
85.00

Water calculations explained?

Want to know more about water efficency, get the complete low down on the why, how and what. To learn more click here and see our water calculation explained guide.

How we can help?

Using our years of expertise we are able to advise on the size, flow rates, capacities and quantities for any size project. We typically assist in either of the following stages, all available for online purchase and with either standard or express turnaround times.

Pre Planning - Stage 1

If you are making a planning submission for a new dwelling or site, you may be asked by the local planning authority to submit evidence of the predicted water usage. At this stage you are unlike to know the exact specifications for all the water usage fixtures and fittings. To help at this early stage of the project we are able to conduct a review of the dwelling/s and provide a detailed specification of maximum flow rates/capacities of the water fixtures in order to demonstrate the desired water efficiency usage set by that particular planning authority or maybe just to meet standard Building Regulations. You will be provided with a PDF report which can be used to submit with your planning application.

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Post Planning (pre-commencement conditions) - Stage 2

Depending whether you submitted evidence of the water usage at a pre-planning stage, you may well have secured planning but have a pre-commencement condition to discharge before you can start the building works. If you didn't submit the predicted water usage with your application we can assist in the same way as above (stage 1) and provide you with a detailed report confirming the maximum flow rates/capacities of the water fixtures in order to demonstrate the desired water efficiency usage set by that particular planning authority. You will be provided with a PDF report which can be used to submit for discharge of the pre-commencement condition.

 

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Pre or Post Planning (a detailed review) - Stage 3

We are able to undertake a full review of the proposed fixtures and fittings to be installed/provided to ensure these are sufficiently compliant with your particular requirements and the flow rates/capacities of the water fixtures are allowable. If for what even reason any of the fixtures or fittings exceed the requirements we'll provide helpful and practical advice and solutions. Upon completion of the calculation you will be provided with a PDF report which can be used to submission to the planning authority or building control body for approval.

Why Use BEAT?

BEAT Solutions are experienced in produced Part G Water Efficiency Calculations having worked on hundreds of projects and thousands of dwellings. This level of experiences enables us to offer years of product knowledge and helps ensure a desirable outcome for project.

Very professional advice, friendly prompt service. Quick delivery of all certificates needed to complete building project.

B Foster - Farnham

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