The parliamentary budget office has stood by its costing of Labor's Allianz Stadium proposal, after questions were raised by the NSW government.
Michael Daley has criticised the NSW government for questioning the independent costing of Labor's plan to make the SCG Trust take out a loan to refurbish Allianz Stadium instead of using taxpayer money.
The parliamentary budget office on Monday said the policy would improve the state's budget position by $685 million over four years.
It sought further advice on Thursday night, after concerns were raised about the costing figures.
"However ... the PBO has not seen any compelling reason that would lead to a change of the costing," the PBO said in a statement on Friday.
"The PBO notes that any party can ask a question. The PBO examines any such questions carefully. Asking a question does not cancel a costing."
Mr Daley accused the premier's office and treasurer of bullying the PBO into changing its costing on the eve of the election, labelling it "unacceptable".
But he said Labor's plan remains in tact and the Moore Park venue can be refurbished at no cost to the taxpayer.
"Labor's policy still stands," he told reporters outside the stadium on Friday.
"This government has been slapped down by the independent Parliamentary Budget Office, who says there was no change to their policy."
Major demolition works have already begun on the stadium, which will be torn down and replaced at a cost of $730 million under the coalition's plan.
Labor had been pushing to delay the knock-down until after the election, in the event it won and could refurbish it at a cheaper cost.
Mr Daley said his advice was that only superficial damage had been done and was hopeful that the stadium could be "beautifully refurbished" in its current state if he is elected premier.