The new regulations have already been delayed but rushing them in now would be too great a burden because of other changes impacting on the industry.
Joinery manufacturing and woodworking firms are dealing with the new Construction Products Regulation (CPR) and the requirement for CE marking which becomes mandatory from 1 July 2013.
Introducing Part L now would mean a clash of new regulations, creating “a costly and bureaucratic burden on the entire joinery industry”.
BWF chief executive Iain McIlwee said: "The delay has meant that our members are spending time and money getting detailed u-value calculations complete for all relevant joinery products in order to comply with the CPR which comes into force next month. Revised Part L regulations could mean that all that work may need to be done again.
"We hear there are still many details on Part L still to be clarified, this process is taking too long. Realistically implementation in 2013 is a non-starter if changes are being made. It makes far more sense to defer proposed changes until next year. Business needs clarity, certainty and time to prepare."