In August, spending at hardware stores increased by 15 per cent, garden centres 8.2 per cent and furniture stores 1.2 per cent.
BNZ senior economist Doug Steel said the change in Government and new policies had unsettled business but consumers were positive about changes such as increase to minimum wage which is why spending had increased.
"Consumers are feeling relatively good - and certainly good compared to business," Steel said. "If you look at the likes of consumer confidence surveys, they are holding up very positively, and even things like population growth and job ads have been relatively positive over the last couple of months."
Steel said increase to the minimum wage in April had begun to flown through and consumer spending figures from here on would likely rise.
"These August numbers are finally showing that some of this stimulus is coming through, consumers have now got the money and have spent it, and that may well perk up businesses a little bit," he said.
"If you look at the detail in the business surveys, retailers are the most pessimistic.
"I think the increase in spending may go someway to alleviating some of the extremes in activity in the sector.
Economic growth in the second half of the year would likely be stronger than the first half, Steel said.
"These August figures are the first signs of consumers [now] have money and are spending it, and if that's the case then we should see some improvement in business sentiment on the back of it."