The 1930s, four bedroom, two bathroom bungalow is listed as up for auction on 8 July.
The Sandringham house was sold to the couple in 2018 for $1.74m and has a current value of $2.21m, according to OneRoof.
The property listing describes the home as having "traditional weatherboard charm" with the addition of a modern extension.
In February, a statement on behalf of Dame Jacinda said she and her family had been travelling "for a few years now".
"For the moment they're basing themselves out of Australia - they have work there, and it brings the added bonus of more time back home in New Zealand," it read.
Dame Jacinda, Gayford and their now eight-year-old daughter, Neve Te Aroha, were previously based in the US where Ardern was appointed to two fellowships at Harvard University.
Dame Jacinda was elected as prime minister in 2017 during which time she dealt with dealt with a natural disaster, a terror attack, a global pandemic and two election victories before retiring at the end of her second term, saying she didn't have "enough left in the tank".
She became New Zealand's third female prime minister and the world's youngest female head of government at age 37.
Dame Jacinda recently released a memoir, A Different Kind of Power, and a children's book, Mum's Busy Work. A documentary about her time in the job, Prime Minister, won the top prize for best documentary at the 2026 News & Documentary Emmy Awards.
