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Site updated 11th July 2011



UK Building Regulations - Conservation of Fuel and Power

UK Building Regulations for Conservation of Fuel and Power Applicable to Rooflights

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

The Building Regulations 2000 (England and Wales) Approved Document L (2002 edition), which is in two parts :

  • L1 Conservation of Fuel and Power in dwellings.
  • L2 Conservation of Fuel and Power in buildings other than dwellings.
    The Building Standards (Scotland) Regulations 2001, Part J, Conservation of Fuel and Power.


    These latest editions of the regulations came into force in 2002 and include requirements for minimum insulation levels in buildings, limited levels of heat loss through openings and penetrations, more efficient ventilation and heating systems and minimum levels of natural daylight.

    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.

    Specially designed Filon FAIRS sheets can be used in site assembled rooflight construction to achieve a U-value no worse than 2.2W/m2K and factory assembled in-plane and Filon Monarch rooflights are available with double or multi layers 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.

    If you wish to obtain more information about the UK Building Regulations 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. Conservation of Fuel and Power Brochure (105Kb)



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