Carson St in Castlecliff is set to be extended thanks to a $1.9 million government investment.
It is part of a $192m infrastructure package announced by Housing Minister Megan Woods on Wednesday.
The extension will allow about 340 additional homes to be built in the area.
Tūpoho Investments Limited has partnered with the Whanganui District Council for the project.
Tūpoho chairman Ken Mair said they supported genuine relationships with iwi, hapū and the community within the Whanganui rohe.