The 21 members of the Estates are elected by proportional representation. Parties that won at least one seat in the 2016 election were allowed to participate and a primary election was held to determine which other parties could run. These parties were required to win the equivalent of 1% of the votes cast in the previous general election in order to participate.
A total of 14 parties registered to contest the election. Six parties were without parliamentary representation and had to participate in the primary election on 18 and 19 March 2017. Parties that won more than 792 votes (1% of the total votes in the 2016 election) qualified to participate in the election.