Work on the New Edinburgh Way block will start on May 1, which is months ahead of schedule.
The earlier start is because work in the Knox block is drawing to a close more quickly than had been expected.
It had been due to finish about August, but is now expected to be completed in June.
The New Edinburgh Way block, between Hanover St and the five-way intersection that includes Frederick St, is the final piece in the four-block revamp.
George St, Dunedin's main shopping street, is the focus of an upgrade of the retail area in the central city.
The council has said previously the overall project is due to be completed by September 2024.
The council did not specify a new estimated finishing time in its statement yesterday, but it could be before winter next year.
Construction work started in the retail area in October 2021.
A broader central city plan is budgeted to cost just over $100 million and the forecast spend for the George St upgrade is just over half of that.
The Knox Row stretch of George St is to retain two-way traffic and the other three blocks in the redevelopment will have one-way traffic.
Dunedin City Council infrastructure and development general manager Simon Drew said it made sense to bring more work forward after progress in the Knox block, which is between the five-way intersection and Albany St.
"Starting earlier in New Edinburgh Way will allow us to complete key pedestrian areas there ahead of the busy trading period leading into Christmas, which we know is an important time for businesses," Mr Drew said.
Pedestrian access would be maintained, shops would remain open and car parking would be available nearby, the council said.
The work involved replacing and upgrading ageing pipes and then creating a more people-friendly space above, including new paving, street furniture, lighting, plantings and public art.
A final push to complete work in Great King St gets under way this week.
"The street will be one-way southbound for the next fortnight while raised crossings are installed, new footpaths completed and the road resealed," the council said.
The George St Malls block, which is between St Andrew St and Hanover St, remains on track to be completed about September.
The first stretch in the George St redevelopment, the Farmers block between Moray Pl and St Andrew St, was reopened to one-way traffic in November last year.
