It is understood that there is every likelihood that the final version of the document will not see the light of day before February 2007 at the earliest.
This would leave architects and engineers in a state of disarray, as it would give them only weeks to prepare for the strict new regulations to come into force.
The final Part B document is being widely trailed by government mandarins as a serious increase in the already stringent rules.
The potential for yet more delays to Part B leaves open the possibility of a repeat of the Part L debacle of earlier this year.
The rush to publish Part L meant that the final document - which was available just days before it became law - was littered with mistakes and a costly reprint had to be ordered ( Error-ridden Part L published).