The Opportunities Party wants to make renter rights more secure, but their policy to do so could mean first homebuyers entering the property market can't live in their own homes.
Gareth Morgan's party would get rid of lease terms in favour of the German rent model where all leases are assumed to be long-term.
It would give renters - who could quickly become a majority of the population - greater rights against being evicted from their properties by landlords.
Legitimate reasons for evictions would include property damage and non-payment of rent.
Selling a home wouldn't necessarily mean a landlord could kick out their tenants under the party's plan for Tenancy Act reform, meaning new property owners would have to take on the people living in the property and could be unable to move in themselves.
"Selling the house is not considered an adequate reason," Mr Morgan's policy says of the German system it hopes to replicate.
"The key is long-term tenancy rights. This way families can opt to be tenants forever and not be undermined by fear of losing their home."
According to the policy 38 per cent of occupants are tenants, but that number could reach 60 per cent.
The long-term security would be comparable to that of people buying a home, Mr Morgan said.
Additionally TOP would seek to improve rental conditions by introducing a Warrant of Fitness for properties and to raise building standards over time.