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Water Research Centre Limited


This online calculator has been prepared by WRc Ltd in accordance with the Government's National Calculation Methodology for assessing water efficiency in new dwellings in support of the Building Regulations Approved Document Part G, 2010.
The online calculator is recognised by the following bodies as a useful calculation tool:

  • LABC (Local Authority Building Control)
  • The Building Control Alliance (comprising Association of Building Engineers, Association of Consultant Approved Inspectors, Local Authority Building Control, the Royal Institution of Chartered Surveyors and the Chartered Institute of Building.)

Neither WRc Ltd, LABC nor the Building Control Alliance accept any liability or responsibility in respect of the National Calculation Methodology, data entered, nor for the results produced by any party using this online calculator or the National Calculation Methodology, nor for any decisions taken based upon those results.

Any support required in the use of the National Calculation Methodology or comments on the Methodology should be sought from or submitted to Department for Levelling Up, Housing and Communities.

Copyright and all other intellectual property rights in the online calculator belong to WRc Ltd.

Before using the online calculator please ensure that you have read and accept the terms and conditions relating to the use of WRc's website below.

Who we are and how to contact us

wrcpartgcalculator.co.uk and wrcgroup.com are sites operated by Water Research Centre Limited ("We") who are owned by RSK Group.

We are registered in England and Wales under company number 11172223 and have our registered office at Spring Lodge, 172 Chester Road, Helsby, Cheshire, WA6 0AR.

Our VAT number is GB 371 4158 05

By using our website, you accept these terms

By using our website, you confirm that you accept these terms of use and that you agree to comply with them.  If you do not agree to these terms, you must not use our website.

There are other terms that may apply to you

These terms of use refer to the following additional terms, which also apply to your use of our site:

  • Our Privacy Policy, which sets out how we will use your personal information.
  • Our Cookie Policy, which sets out information about the cookies on our site.

We may make changes to these terms

We amend these terms from time to time. Every time you wish to use our website, please check these terms to ensure you understand the terms that apply at that time.

Our trade marks

WRc Ltd, WRc Approved and WRcCSO are trademarks of Water Research Centre Limited. You are not permitted to use them without our approval, unless it is part of material you are using as permitted in these terms.

How you may use material on our site

We are the owner or the licensee of all intellectual property rights in our website, and in the material published on it.  Those works are protected by copyright laws and treaties around the world. All such rights are reserved.

You may print off one copy, and may download extracts, of any page(s) from our site for your personal use and you may draw the attention of others within your organisation to content posted on our website.

You must not modify the paper or digital copies of any materials you have printed off or downloaded in any way, and you must not use any illustrations, photographs, video or audio sequences or any graphics separately from any accompanying text.

Our status (and that of any identified contributors) as the authors of content on our site must always be acknowledged.

You must not use any part of the content on our site for commercial purposes without obtaining a licence to do so from us or our licensors.

If you print off, copy, or download any part of our website in breach of these terms of use, your right to use our website will cease immediately and you must, at our option, return or destroy any copies of the materials you have made.

Do not rely on information on this website

The content on our site is provided for general information only. It is not intended to amount to advice on which you should rely. Please contact us to obtain specialist advice before taking, or refraining from, any action on the basis of the content on our website.

Although we make reasonable efforts to update the information on our website, we make no representations, warranties or guarantees, whether express or implied, that the content on our site is accurate, complete, or up to date.

We are not responsible for websites we link to

Where our website contains links to other sites and resources provided by third parties, these links are provided for your information only. Such links should not be interpreted as approval by us of those linked websites or information you may obtain from them.

We have no control over the contents of those sites or resources.

Our responsibility for loss or damage suffered by you

We do not exclude or limit in any way our liability to you where it would be unlawful to do so. This includes liability for death or personal injury caused by our negligence or the negligence of our employees, agents, or subcontractors and for fraud or fraudulent misrepresentation.

We exclude all implied conditions, warranties, representations, or other terms that may apply to our website or any content on it.

We will not be liable to you for any loss or damage, whether in contract, tort (including negligence), breach of statutory duty, or otherwise, even if foreseeable, arising under or in connection with your use of, or inability to use, our website or your use of or reliance on any content displayed on our website.

In particular, we will not be liable for:

  • loss of profits, sales, business, or revenue;
  • business interruption;
  • loss of anticipated savings;
  • loss of business opportunity, goodwill, or reputation; or
  • any indirect or consequential loss or damage.

Governing law

These terms of use, their subject matter, and their formation (and any non-contractual disputes or claims) are governed by English law. We both agree to the exclusive jurisdiction of the courts of England and Wales.


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