U values and CE markings

CE markings affect all joinery manufacturers. If a timber window or door requires a U value then it also needs a CE mark. 

Some joinery companies are still not providing U values which relate to Building Regulations (Part L). This stipulates (since October 2010) that external windows need to have a U value of 1.6 for a renovation project or 2 in a new build. External doors require a U value of 108.

If you are considering using a manufacturer who is using the U value of the double glazing, this is not the same as the overall U value. The overall U value is based on:

  • Type of timber 
  • Centre pane U value
  • Psi value of spacer bars

If a U value is not required due to conservation exclusion, then CE markings will not be required either. Most bespoke windows will require a U value as they are not truly bespoke.

Truly bespoke windows will be exempt from requiring U value and therefore CE markings.

The requirement to CE mark external timber windows and doors

This requirement became mandatory on the 1st  July 2013. CE marking is a key indicator of a product compliance with EU (European Union) legislation and enables the free movement of products within the European market.

CE marking confirms that a product satisfies the legislative requirement. It means the manufacturer has verified that the product complies with all relevant essential requirements, e.g. Health and safety requirements, of the applicable directive(s) or if stipulated in directive(s) had it examined by a notified conformity assessment body.

The CE mark is specified by the EU but refers to the relevant country’s regulations. Within the UK, this enforces compliance with (Building Regulations Part L) which is applicable for all external windows and doors covered by the legislation within the UK. The legislation is enforced by Trading Standards not Building Regulations.

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