The government will not impose energy-efficiency requirements on home refurbishments, despite indications that the measures would be included in new building rules.
A draft consultation on the 2010 Part L of the Building Regulations, launched by housing minister John Healey last week, was originally intended to require properties receiving "consequential improvements" - such as extensions - to also undergo energy-efficiency upgrades.
However, the consultation was published without these measures, leading to criticism from the construction industry.
David Strong, Chief Executive of Inbuilt Consulting, told the Architects' Journal: "This is a key policy instrument that would deliver high-carbon savings per pound invested and is very important to carbon abatement if we are to meet the Government's 2050 targets.
"The entire industry is shocked that the measure was again dropped at the last moment and not even included as a consultation question."
Climate change secretary Ed Miliband announced last year that the UK would aim to reduce emissions by 80 per cent on 1990 levels by 2050.
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