One in five renting households spent more than 40 per cent of their income on housing costs in the year to June.
Statistics New Zealand figures show that while average housing costs have stayed flat in the past year those with a mortgage have benefited from an average 11 per cent fall.
Average mortgage interest payments dropped from $283.70 a week to $250.80 a week year on year.
Sean Broughton, Statistics New Zealand labour and income statistics manager, said lower mortgage interest rates had helped to dampen housing costs which remained virtually unchanged on 2016 at $318.50.
"Housing costs have been held in check by lower mortgage interest rates, which affected both floating and two-year fixed mortgages," he said.