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In the consultation, we are also seeking views on whether we should require energy efficiency standards for conservatories. We know that conservatories are a relatively cost-effective way of increasing the living space of a home, however, they can significantly increase carbon emissions—a 20m2 conservatory with poor energy efficiency standards added to a house built since 2002 and heated to the same temperature as that house, would approximately double its carbon emissions. So we are asking whether we should expect people to spend an estimated additional £400 on a £10,000 new conservatory to improve its energy efficiency.

Later, we will be consulting more fully on how to take forward the ambition from the March 2008 Budget that all new non-domestic buildings should be zero carbon from 2019. In the mean time, as we said in the zero carbon consultation in December 2008, it is important

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to take early steps to start to further improve the energy performance of non-domestic buildings. So, today’s Part L consultation also sets outs proposals for a 25 per cent improvement on current standards for new non-domestic buildings from October 2010.

And finally, the consultation sets out proposals to tighten the standards for some standard building systems and components, like boilers and windows, which

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makes a significant difference to carbon emissions from both new buildings and when these items are replaced in existing homes.

The consultation will close on 17 September 2009 and any changes to the regulations are due to be made by March 2010 to come into effect from October 2010.

Copies of the consultation documents will be placed in the Library of the House.


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