Stephen Giles, managing director of ConservatoryQuoteOnline.com, said: "The only logical conclusion is that by adding further costs the conservatory market will suffer, putting a strain on suppliers and the building industry."
The increased cost of construction could be offset if electricity and gas savings were substantial enough.
As well as addressing the issue of housing extensions, the government is planning to retrofit every home in the UK with energy saving measures in the coming years.
It has pledged to fit energy saving devices such as solar panels and improve insulation in seven million homes by 2020.
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