The independent non-profit organisation is urging people to research different providers as switching may save hundreds of dollars per year.
The car insurance premium survey found changing companies could save almost $700 a year on average for a family of four.
Consumer NZ investigative team leader Rebecca Styles said the ballooning costs came down to multiple factors.
"The extreme weather events, the Auckland floods, claims from that, as well as the Cyclone Gabrielle and rising inflation, the cost of repairs is going up ... they're all factors in the increasing prices," Styles said.
"We surveyed four scenarios and the family of four, the medium price had increased the most for them, it went up 38 per cent since 2021. For other scenarios, older person it went up 24 per cent, for a middle-aged person 21 per cent and then for a younger person it's gone up 30 per cent since our 2021 survey," she said.
The survey also found the increase in payments meant a growing number of people were starting to go without it because it was getting too expensive.
"We are starting to see some people choosing not to insure their vehicles, so in 2022 when we asked the question people are going without insurance just 2 per cent said they were but this year it had gone up to 10 per cent - so it is a worrying increase of people going without car insurance," Styles said.
The type of car a person drives will also influence the insurance premium and some people do not know the difference between full insurance and third party, which may be a cheaper option but will not cover a person if they get into a crash.
"Maybe people don't quite realise the difference between comprehensive and third party and third party fire and theft, which offers a little bit more protection than third party. Obviously the comprehensive gives you the most cover but there are those other options there if comprehensive insurance is becoming unaffordable."
Insurance Council chief executive Tim Grafton said there were "a number of factors" that explained increases in motor vehicle premiums.
He said later model cars had more technology in them which made them more costly to fix.
A sharp increase in motor vehicle claims following the major flooding events earlier this year was another contributor, he said.
The impact the poor state of New Zealand's roads had on vehicles was another, as was the cost of inflation.
Grafton said there had also been an increase in the number of cars stolen due to ram raids.
He believed with the costs coming through for insurers it would be unlikely to see a reduction in premiums.
