WA Premier-elect Mark McGowan has vowed to get to work immediately on implementing his ambitious platform, after Labor was swept into office in a landslide.
Mr McGowan ended eight-and-a-half years in opposition for Labor, inflicting a powerful defeat on Colin Barnett's Government and the Liberal Party.
Labor needed to win 10 additional seats to form government but it picked up at least 18 and may take as many as 21, and has secured a sizeable parliamentary majority.
The 16 per cent swing against the Liberals saw at least four ministers lose their seats, while Liberal leadership aspirant Joe Francis and Nationals leader Brendon Grylls are also facing nervous waits to finds out if their parliamentary careers are over.
Labor got 36 seats, Liberal got 11 seats and Nationals got 5 so far.