Approval Process

To join the Pilkington energiKare™ scheme you'll need to meet specific qualifying criteria.

IGU members should demonstrate that their IGU manufacture meets EN1279-3 for Argon filling or EN1279-2 for Air filling with warm edge spacer bar.

Window members should hold or, for installers only, demonstrate that their window supplier meets the prevailing Building Regulations for energy efficiency for homes, currently a Window Energy Rating (WER) of C or above or U-value of 1.6.

IGU member approval

On receipt of your Agreement and Registration Forms please email your EN1279-3 or EN1279-2 certification to us on

  • If you are applying for the certification please let us know your expected time to completion.
  • If you need any help or advice do contact your Pilkington representative or our helpline.
  • We can supply you with IGUs until you are ready so that you can start your promotion. Again, contact us for supply details. 

Window member approval

There are a series of easy steps to gaining approval through specialist suppliers which are summarised here.


  • Internal Preparation: Simulation and Quality Management
  • Simulation involves checking that your product meets the basic thermal performance requirements. This is carried out by approved simulators. Pilkington has a database of results for the most popular profiles in conjunction with Pilkington energiKare™ called WER V4 so if you contact us we can help you.
  • Quality Management means that you have a recognised system in place such as ISO 9001 or similar.
  • Select an Independent Agency (IA): There are a number of IAs. We are working with Buildcheck who can carry out the simulation and liaise with the IA on your behalf. Contact our helpline for advice on how to do this.
  • IA verification: Results from Approved Simulators are automatically accepted by the IAs. The IA will check on the presence and operation of a suitable quality management system or, if the manufacturer does not have one will audit the existing system to check whether it complies.
  • WER Registration: At this stage the IA informs the WER scheme provider of the results and asks for formal recognition and listing. With the BFRC, once the fees have been paid, the manufacturer is listed on the BFRC website which is promoted to homeowners.
  • Use the WER label: to provide information about Building Regulations to specifiers and consumers and hence promote your sales.