"This may be a case of 'the spirit is willing but the body is weak," ANZ New Zealand chief economist Cameron Bagrie said in a statement. "Given the skill and broader resource mismatches in the New Zealand economy, we are sceptical that such a growth rate is achievable - it's certainly not sustainable."
The survey showed profit expectations, employment and investment intentions all lifted, led by the construction sector, ANZ said.
Some 25.9 per cent of firms expected profits to rise in the next 12 months, up from 19.7 per cent last month and the highest since April 2010. A net 17 per cent expected to take on more workers, up from 9.8 per cent last month and the highest in two years.
Meanwhile, some 22.3 per cent expected to increase investment, up from 16.5 per cent last month and the highest since late 2003.
Pricing measures remain benign but are creeping up led by construction with a net 25.8 per cent of firms expecting to raise prices, up from 20.3 per cent last month.
Inflation expectations lifted slightly at 2.3 per cent from 2.22 per cent last month.
The survey canvased the views of 414 businesses.