The last placed team of the regular season will play a best of three relegation playoff against 1. division's third-placed team (as both the winner and the runner-up of 1. division will be automatically promoted to the 2018–19 Damehåndboldligaen).

Highest ranking team in the regular season has the home advantage in the first and possible third match.

Highest ranking team in the regular season has the home advantage in the first and possible third match.

Highest ranking team in the regular season has the home advantage in the first and possible third match.

Highest ranking team in the regular season has the home advantage in the first and possible third match.