A Consumer Affairs price check survey of eight of Western Australia's largest motor vehicle insurance companies has revealed price variations of up to $558 for a year's cover.
Consumer Affairs Minister Yvonne Henderson said the results showed that a 19-year-old living in Perth would pay between $716 and $1,274 for full comprehensive insurance.
"The difference of $558 means a lot to young people, whom I strongly advise to shop around to get the best value," Mrs Henderson said.
"Even with the best value, because they are considered a higher risk, young P-plate drivers are paying around three times more than older drivers for their motor vehicle insurance.
"As well, the survey showed that a 19-year-old driver could be liable for an age excess ranging from $300 to $750 if they have an accident."
Mrs Henderson said the survey revealed a range of up to $122 for Perth drivers in their mid-thirties.
Prices ranged from $193 to $315 per annum.
There was less variation in premiums for third-party cover.
Mrs Henderson said the price check, carried out by the Ministry of Consumer Affairs, covered premiums based on a $7,000 XE Ford Falcon automatic sedan, on which no finance was owing.
Two age scenarios were used - a 19-year-old driver on P-plates and a 35-year-old driver with a maximum no-claim bonus.
The insurance companies, five of which hold 80 per cent of the market, quoted prices for Perth and five major country centres.
"The wide range of prices between companies should again remind consumers to ensure they are fully informed of costs and service provided before making any important purchase," Mrs Henderson said.
"In the case of motor vehicle insurance, consumers should examine all aspects of their policy, including any excess or discount and offers of extra cover such as windscreen replacement."
