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The work, which begins at the George St end of London St, working towards Filleul St in stages, started this week.
Road closures will be in place from next Tuesday.
Dunedin City Council general manager infrastructure and development, Simon Drew, said the focus of the works would be to replace old drinking-water, wastewater and stormwater pipes, and upgrade kerbs, channelling and footpaths .
The work needed to be done before other work to improve traffic flows on London, Filleul and Great King Sts, which was, in turn, being done before the George St upgrade — three blocks of George St are to be made one-way in a southbound direction.
The George St work would begin early next year.
The work on London and Filleul Sts would also include improvements to road safety and access to car-parking facilities in the area.
Parts of both streets would be closed, but residents would still be able to access their properties.
The council asked people to allow extra time if they needed to travel in the area as there would be delays, Mr Drew said.
The work was expected to be completed by Christmas, depending on weather conditions.