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Site updated 11th July 2011



UK Building Regulations - Conservation of Fuel and Power

Rooflight Design to Meet Building Regulations Part L2
Guidance Documents ADL2A and ADL2B 2006

The Regulations for the Conservation of Fuel and Power are detailed in the following documents.

The Building Regulations 2000 (England and Wales) Approved Document L2 (2006 edition), which is in two parts :

  • L2A Conservation of Fuel and Power in New Buildings other than Dwellings.
  • L2B Conservation of Fuel and Power, work on existing Buildings that are not Dwellings.

    These latest editions of the regulations came into force in April 2006 and include measures to further reduce Carbon Dioxide (CO2) emissions as part of an on going legislative program. The controlled use of natural daylight to reduce the use of electric lighting and the resulting CO2 emissions is one such measure.


    It is a recognised fact that natural daylight has beneficial effects, creating a pleasant environment and promoting a feeling of well being for people within the building. In addition, natural daylight reduces the need for artificial lighting thus saving power. Natural daylight also carries with it infra red frequencies, which provide passive solar gain that will reduce power consumption by heating systems.

    The most efficient method of transmitting daylight into large buildings is through rooflighting and Filon Products has a range of rooflight solutions to provide compliance with the new Building Regulations.

    A specially designed insulating layer may be used in site assembled rooflight construction to achieve a U-value of no worse than 2.2W/m2K, with lower U-values available. Factory assembled in-plane and Filon Monarch rooflights are also available with a range of U-values to provide the appropriate level of insulation. Filon Products is also developing new rooflight solutions in order to ensure compliance with future revisions to the UK Building Regulations.

    To obtain more information on the UK Building Regulations Part L2 for rooflights, you can view and print the literature in PDF format. To do this you will need Adobe Acrobat Reader running on your computer. Rooflight Design to Meet Building Regulations Part L2 Brochure (57Kb)



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