Ms Hamill said Wairarapa was still an affordable area for renters, despite the increase in rents. She didn't believe locals were struggling to find rentals they could afford.
A property renter in Auckland can now expect to pay at least $400 a week, Trade Me figures show.
Head of Trade Me Property Nigel Jeffries said even the smallest unit or one-bedroom home would cost a typical Auckland renter $400 per week.
Outside Auckland, median asking rent remained relatively stable for the fourth month in a row, up 3 per cent to $360 per week.
Over the past five years, the median asking rent for a property outside of Auckland has increased 20 per cent from $300 a week in August 2010 to $360 a week in August 2015.
Median asking rents increased in 10 regions, fell in three regions and were unchanged in two regions.
The Trade Me Property Rental Price Index measures trends in median weekly rents for residential properties on Trade Me Property rented out by real estate property managers and private landlords over the past month. About 11,000 rental properties are let via Trade Me Property each month.
