The DTI was due to have announced this week that 765 firms were undergoing assessment to join the quality mark.
A report in January by consultant Atkins said 40,000-45,000 members would be needed before the scheme could be publicised to homeowners throughout the UK.
A DTI spokesperson said this publicity campaign could take place next year if enough builders joined.
The DTI has begun its recruitment drive in north-west England, and will target the North-east and London.
A government investment committee is considering funding for further regional recruitment drives. So far the government has spent £5m on the scheme.
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