The government has been forced into a major U-turn over one of its recent building regulation reforms.
The Department for Communities and Local Government has suspended a section of the new Part F which relates to the addition of 'trickle ventilators' to all new windows.
Mandarins have accepted that after the cost of this was heavily disputed by industry authorities, the price 'could exceed the benefits'.
It is understood that the original estimate put the cost of this clause to the UK construction industry at £8m, when in fact it was closer to £80m.
They are now writing a new version of the document.
According to reports from the National Building Specification, Les Fothergill of the Buildings Division of the DCLG admitted the mistake last month.
He has been reported as saying: 'There was a mistake in the costings and the actual cost to the industry of carrying out this work was more than we were originally led to believe.
'The industry was consulted and now the option is to either amend or repeal the clauses'.
For the existing document, go to www.communities.gov.ukby Ed Dorrell