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.