Rents have gone up 13.9 per cent in the Bay of Plenty since July last year, new Trade Me figures show.

Most regions across the country saw increases year on year, but it was Auckland's "halo regions" of Bay of Plenty, Waikato and Northland that saw the biggest hikes.

Bay of Plenty was up 13.9 per cent, Waikato was up 8.8 per cent, and Northland was up 11.1 per cent.

The data is produced from Trade Me Property data of properties that have been rented in the month by property managers and private landlords.

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The index was calculated using the median rent in the month, this being an accurate statistical assessment of the current rent being charged by landlords and property managers.