Pauline Hanson’s One Nation has secured three seats in Western Australia’s upper house, meeting the party’s expectations after it failed to secure a single seat in the lower house.

State leader Colin Tincknell secured a South West seat on election night and a fortnight later, Robin David Scott won a seat in the Mining and Pastoral region while Charles Smith grabbed an East Metropolitan seat.

Mr Smith’s win was a surprise as some analysts were expecting the seat to go to Liberal MLC Alyssa Hayden.

He was among several One Nation candidates to speak out against the party’s preference deal with the Liberals, which both sides have said damaged them at the polls.