The independent inquiry was announced immediately after gale-force winds caused the grandstand roof to detach from its supports in September last year.

The $31 million grandstand finally opened in June after the damaged roof was removed and replaced by a structure of a slightly different design.

Asked when the results of the inquiry would be made public, Sport and Recreation Minister Graham Annesley said it fell under Finance and Services Minister Greg Pearce's portfolio.

Mr Annesley said he understood the report could not be released at this stage because it was "subject to potential legal proceedings".

"What I can tell you is that I've been advised that there has been no ... additional taxpayer money, over and above what was obviously allocated for the construction of the grandstand, as a result of the roof problems," he said.

Mr Annesley was in Wollongong to announce the deal for the St George Illawarra Dragons to play at WIN Stadium for the next five years, with an option for five more.A Department of Finance and Services spokesman said matters in relation to the NSW Public Works report "may be subject to legal proceedings at a future date".

"Therefore the government is unable to comment on the report at this time," he said.

Chris Christodoulou, former chairman of the Illawarra Venues Authority (which has been replaced by Venues NSW), said he was surprised the report had not been released.

"I think it's important that the public finally get to know what went wrong with the roof so as to be able to learn from that mistake, and also to be clear that the roof rectification has actually fixed up the issue," he said.

It is understood insurance companies are still carrying out investigations.