A venture that has helped take NSW's building industry from "last to first" in the country will be extended as the premier encourages more apartment living.
About 100 corporations have leant on Building Commissioner David Chandler to mediate defect disputes with developers since mid-2022.
Registrations were to close within weeks but will now roll on until November, when the Building Commission becomes a permanent fixture on the NSW construction landscape.
The assistance provided by the commissioner's employees includes help repairing serious defects in the common property of buildings, including waterproofing, fire safety systems, structural systems, building enclosure and building services.
"NSW has come from last place four years ago to first place because of the work of the building commissioner," Urban Development Institute of Australia chief executive Steve Mann told reporters on Sunday.
"(Project) Intervene gives pathways to create solutions quickly and inexpensively.
"That's what we need in NSW because apartments need to grow so we can deal with the housing affordability crisis."
Mr Chandler said new regulations, industry change and the advent of the permanent commission later this year meant the "rubber was starting to hit the road pretty well everywhere".
"There are still some people who have yet to get it but they will, in the not-too-distant future," he said.
"I'm really pleased to see that we're now winning the confidence of consumers to come forward and say, 'Hey, we've got some problems' because it's no good sweeping these things under the carpet ... serious defects do catch up with you."
Mr Chandler was appointed after well-publicised defects in two unit complexes - Opal Tower and Mascot Towers - and revelations hundreds of owners corporations were stuck chasing dodgy builders who'd left a litany of seriously defective towers across Sydney.
The new commission would turn his team's recent work into business-as-usual, he said.
"No other state in Australia has the consumer protections we now have in NSW," the building industry veteran said.
Premier Chris Minns said the new building commission would concern itself with future construction so that recent issues didn't happen again.
With increased construction of buildings and apartments expected over the next 10 years, Mr Minns said his "firm hope" was that systems would be in place from day one.
"We can reduce the amount of buildings and owners corporations that are put into this situation," he said.
Planning law changes would be announced in coming months to help build more homes quickly and safely, the premier said.