"It's a dump. It's not insulated, we deal with industrial noise and smells, it's mouldy and damp. And one of the apartments next to me is rented for $400. It seems criminal that they can [charge] that much just because there's a housing shortage."
Student Jasmine Ward says she was priced out of her Waterview flat only two and a half months after moving in, because the landlord raised the rent $100. All four tenants are moving out because they cannot afford to stay.
Harcourts property manager Sharon Ryan said the rises were the work of an opportunistic few - often overseas investors - who were disengaged from the rental market.
"If you've got a current tenant and you hike the price up, they can take us to the Tenancy Tribunal. We look at the stability of the rental market, and we prefer to increase $10 or $20 which covers rates or body corp fees."
Landlords are entitled to raise rent every six months, but must give 60 days' notice. Consumer NZ says there is no limit to how much it can go up.
Tenants Protection Association co-ordinator Angela Maynard said landlords had a "worrying" amount of power in the present market and a $150 rent rise was excessive and unusual.
Tenancy Solutions director Nathaniel Hamilton said landlords were not wholly responsible for rent increases, because the market rent reflected what people were willing to pay.
He said many tenants were offering to pay rent above what was advertised to secure a property they were keen on. This practice bumped up the market rent in addition to natural supply and demand, he said.
"Because people are willing to pay a higher amount, it sets the rate for everyone else and the prices keep going up. The market rent will only fall again once supply exceeds demand."