She said boarding houses needed to be inspected regularly to ensure they were sanitary and safe.
Kate Amore, from Otago University's housing and health research programme, said people living in boarding houses long-term were deprived of the same rights as those in private tenancies.
"If you are renting an apartment [and owe rent] you have to be given 21 days' notice, but if you live in a boarding house you only have to be given 48 hours," Dr Amore said.
Someone in a boarding house can be immediately evicted if they cause, or threaten to cause, serious damage to the property, or if they endanger people or seriously disrupt other tenants. But for immediate eviction of someone living in an apartment, the landlord had to apply to the Tenancy Tribunal.
- additional reporting NZPA