All Germans and European Union citizens who have reached the age of 18 and have resided in their municipality for at least six weeks were eligible to vote. Homeless people were also able to vote for the first time with the establishment of a registration process for people with no fixed address.[1] In March 2025, The Greens proposed a bill in the Landtag of Hesse to lower the voting age in the state's municipal elections from 18 to 16, as is the case in the majority of German states. The bill was defeated in September 2025, with the CDU, AfD, and SPD voting against, and The Greens and FDP voting in favour.[2]
Prior to the elections, the CDU and SPD grand coalition in the Landtag of Hesse passed legislation to change the seat allocation method for municipal elections from the Hare/Niemayer method to the D'Hondt method; in order to reduce the fragmentation of district councils among many smaller parties. This change was successfully challenged in court by the Free Democratic Party, Die PARTEI, and the Hessian Klimaliste; meaning that the Hare/Niemayer method remained in use for this election.[3]