All you need to operate Window Energy Ratings
ER Certification Ltd - All you need to operate Window Energy Ratings

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The new name in Certification

ER Certification to introduce the new QCC mark from January 2024.

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Introduction to Energy Rating & U-Value Certification

Energy ratings and U-Value certification


Changes to Building Regulations



There are major implications for Window Frame and IGU manufacturers, as the Government seeks to meet its obligations on greenhouse gas emissions and reduced energy usage.


In April 2010, the Department of Communities and Local Government published the 2010 version of the Building Regulations for England & Wales, with Approved Document L being of major interest to the windows & doors industry. This became a requirement from 1st October 2010. In summary, Window & Door Energy Ratings (WERs) is a preferred means of compliance for replacement windows or those fitted into extensions. The minimum requirement is now a B rating for Windows and B / C for doors, but undoubtedly higher requirements will be required in 2013 and again in 2016.


Further details can be found on our upcoming website 


Manufacturers of windows, IGUs, rooflights and doors should seek advice from their suppliers or other independent sources.



ER Certification Ltd. has have gained UKAS Accreditation for Product Certification under EN 45011, then more recently under ISO 17065.


Our Managing Director - John Warburton - is a qualified Lead Auditor and as such will oversee all the assessments and audits required by the company. ER Certification may use External Resources to conduct audits on our behalf, these agents will be assessed in line with the company's ISO 17065 competence requirements.



Download the application form to join one of the ER Certification scheme.