MARK McGowan is poised to become WA Premier, with a new poll predicting Labor will win Saturday’s State election.

An exclusive Galaxy poll of West Australians, commissioned by The Sunday Times, shows Labor has a 54 to 46 per cent lead over the Liberal-National alliance on a two-party preferred basis.

The poll, which has a history of giving the most accurate prediction of voter intentions, suggests Labor would achieve an 11 per cent swing since the 2013 State election.

A swing of this magnitude on Saturday would see Labor pick up 14 seats from the Liberals to form a majority government.

Labor needs to win 10 seats from the Liberals to seize power.

With six days to the election, key poll findings included:

PRIMARY support for Labor has surged to 40 per cent. This is almost seven percentage points higher than in 2013.

SUPPORT for the Liberals has slumped to just 31 per cent, more than 16 points lower than four years ago.

STATEWIDE support for Pauline Hanson’s One Nation is at 9 per cent, while the Greens are steady at 8 per cent and the Nationals have slipped to 5 per cent. Support for other minor parties and Independents is 7 per cent.

ON THE question of preferred premier, Mr McGowan holds a commanding 46 to 33 per cent lead over Colin Barnett, who is now one of WA’s longest serving premiers.

The poll was conducted from Wednesday to Friday, based on the opinions of 1115 voters across WA.

Camera Icon This survey was conducted by Galaxy Research between 1-3 March 2017. The results are based on the opinions of 1115 voters. The data has been weighted and projected to reflect the population of Western Australia. Credit: PerthNow

Galaxy accurately predicted the hung parliament of 2008 and the emphatic Liberal-National win of 2013. In contrast with other polls which only use robopolling, Galaxy also uses online surveys to better match the sample to the broader population.

With Labor’s primary vote at 40 per cent, Galaxy managing director David Briggs said the party would still be dependent on the flow of preferences from the 24 per cent of voters who support the minor parties.

But he said there was no reason to doubt that they would achieve the usual strong preference flow from Green voters.

As revealed last month, the Liberals struck a preference swap with One Nation in the hope the deal may save them from political annihilation.

The poll suggested that close to 50 per cent of One Nation voters would preference Labor ahead of the Liberals, Mr Briggs said.

If the predicted 11 per cent swing is uniform, Labor could pick up Perth, Forrestfield, Belmont, Swan Hills, Morley, Balcatta, Mount Lawley, Bicton, Kalamunda, Joondalup, Southern River and Wanneroo.

Labor would also win the notionally Liberal-held seats of Collie-Preston and West Swan.

Camera Icon This survey was conducted by Galaxy Research between 1-3 March 2017. The results are based on the opinions of 1115 voters. The data has been weighted and projected to reflect the population of Western Australia. Credit: PerthNow

On the key issue of which party voters are more likely to trust to reduce State debt, the Liberals edged Labor 38 to 37 per cent.

Voters were also divided on Labor’s plan to cancel the Perth Freight Link and redirect some of the Commonwealth money to its Metronet rail plan and other road projects.

Overall, 42 per cent favour Labor’s plan, with 38 per cent opposed and another 20 per cent uncommitted.

Play Video It's where the state election will be won or lost. It's where the state election will be won or lost.

Mr Barnett yesterday predicted West Australians may not know the results of some seats until after election night.

Mr McGowan insisted his party were the underdogs.