The party held its annual conference outside Hobart over the weekend which saw a number of motions discussed.

One from leader Cassy O'Connor was for tenants to be allowed to challenge rent increases above the Consumer Price Index before the state's Residential Tenancy Commissioner.

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The median rent in Tasmania is $390 a week and CPI for Hobart was 1.8 per cent for 2020.

This would mean under the plan, a landlord charging the median rent would only be able to put up their rents $7 a week over a 12-month period.

The median rent in Tasmania went up by 8.3 per cent over the 12 months up to December.

In her motion, Ms O'Connor noted Hobart rental prices had gone up by 36 per cent, Launceston by 40 per cent and Burnie by 30 per cent in the past four years.

Tasmanian Residential Rental Property Owners Association president Louise Elliot said any tenant could take a complaint about an unreasonable rent increase already to the commissioner already for a fee.

"So you'd have to have a pretty solid case," she said.

Ms Elliot said landlords were already fearing impending restrictions on rent increases so were acting earlier than they normally would on rent increases.

"That fear is making more people react and that is pushing up prices," she said.

"Our association's position is the principle of somebody else dictating what an owner can sell their product for is grossly unfair."

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