Energy and the Conservation of Fuel and Power

Part L, Technical Handbook 6 and Part F

In England and Wales, Building Regulations for the conservation of fuel and power are covered by Part L and its accompanying Approved Documents.  For Scotland, the regulations are supported by Technical Handbooks, Section 6 of which deals with energy.  For Northern Ireland the regulations are in Part F, last updated in 2006.

The new Approved Documents for Part L of the Building Regulations in England were published by the Government’s Department for Communities and Local Government (DCLG) in 2013. They came into effect on 6th April 2014. 

Please check out our summary of the main changes to Part L 2013.

The Government has announced that it is dropping its zero carbon buildings policy in England. This means that both the 2016 zero carbon homes target and the 2019 target for non-domestic zero carbon buildings will be dropped. There will be no changes in Part L in England – for new or existing buildings – in 2016.

To read a news story on this announcement, please click here.

For Scotland, the 2013 editions of the Technical Handbooks provide revised guidance in support of the Building (Miscellaneous Amendments) (Scotland) Regulations 2013. They came into force on 1st October 2013.

We have listed all of the parts of the Technical Handbooks in our section on building regulations in Scotland.

One of the most significant changes in building regulations in the past few years was the introduction of  Window Energy Ratings (WERs) as an alternative to U values as a criterion for compliance.  WERs are a much more accurate indicator of the energy performance of a window because they take a range of factors into account, including the useful solar heat gain. We have explained Ratings in more detail in our our Window Energy Ratings Bulletin 3.

Window Energy Ratings are  administered by the British Fenestration Rating Council (BFRC), Thermal Rating Register (Certass) and the BSI.  Detailed information on obtaining BFRC Ratings for windows can be found on:


For existing homes in Scotland, WERs are now an established route to compliance for replacement windows and windows for extensions.  WERs are a much more accurate indicator of the energy performance of a window than the simple U value because they take into account a range of factors, including passive solar heat gain.  We have explained WERs in more detail in our Bulletin 3.

To view details of the full Pilkington range of Thermal Insulation glass, please click here.

There are a range of Pilkington products that help builders and designers meet the various energy conservation regulations.  Pilkington energiKare™ is a range of products that proviides low U values and up to A rated Window Energy Rated windows.  Pilkington energiKare units are made by Pilkington and Pilkington energiKare partners across the country.  Pilkington Insulight is the trade name for Pilkington manufactured insulating glass units that offer a wide choice of energy management options.  Pilkington Insulight can include Pilkington Suncool, a range of solar control glass products that combine low emissivity glass, low U values with solar control with neutral appearance.  Also available with Pilkington Activ self-cleaning glass.  Pilkington Optitherm is a range of low emissivity products that provides very low U values.  

Pilkington Optitherm or the Pilkington K Glass range can be combined with Pilkington Activ self-cleaning glass, Pilkington Optifloat tinted glass, Pilkington Eclipse Advantage, etc, to give a broad choice of thermal and solar control properties.

A recent innovation in energy efficiency is Pilkington energiKare Advantage which can provide triple glazing performance in a double glazing. 

To view details of the full Pilkington range of Thermal Insulation glass to help you meet the new Part L regulations please here.

To find out more about Part L and how Pilkington can provide support to specifiers and trade customers please click here.

To download the Approved Document for England and Wales, including Approved Document L, please click here.

To download the Scottish regulations #6 click here.

To download the Northern Ireland Part F regulations click here.