Controls on rent increases are on the Green Party's shopping list.
The proposal is part of a housing policy announcement being made by party co-leader Metiria Turei at Ratana today.
It would restrict rent increases to once a year and they'd be subject to a formula set in a tenancy agreement.
Ms Turei doesn't think inflationary pressures on housing prices and mortgage repayments by rental property owners would create huge fluctuations on rental rates.
"This is one of the difficulties for anybody who invests in property, that there are these fluctuations that they have to cope with.
"The question is, should tenants be the ones who are fully responsible for that?"
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