A majority of Victorian renters have experienced a "significant tenancy issue", yet only half of them made a complaint due to fears of landlord retaliation, a new report based on a survey of 1,000 renters has found.

The survey by the Consumer Policy Research Centre (CPRC) found 79 per cent of renters in Victoria had faced at least one problem in the past 12 months.

The most common issues were delays to repairs and maintenance, "unreasonable" rent increases and excessive photos and videos being taken during inspections.

But only 52 per cent of the affected households lodged a complaint, and even fewer — just 2 per cent — escalated their complaint to the Victorian Civil and Administrative Tribunal (VCAT).

"What we saw is that there is a broader challenge that even where legal protections

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