Libs, Labor neck-and-neck in WA: Poll

Liberal and Labor are polling neck-and-neck in Western Australian but there's still a 7.3 per cent swing towards Labor.

It's a boost for the Liberals, who were trailing Labor 48-52 a month ago, according to a ReachTEL poll of more than 1650 voters published in The Weekend West.

The swing to Labor leaves it short of the 10 per cent it needs to win power.

Opposition leader Mark McGowan remains the preferred premier, leading Colin Barnett 53-47. But this gap has closed from 56-44 a month ago.

Support for Pauline Hanson's One Nation party has increased slightly to 11.1 per cent.

The numbers of undecided voters have dwindled from 8.5 to 5.5 per cent three weeks out from election day.

Of those still on the fence, 42 per cent are leaning towards the Liberals and 20.4 per cent towards Labor.