A Berlin housing cooperative asks for share money before you get the keys, and that money sits with the cooperative for as long as you stay. This plots the two routes side by side: the share payment plus a low cooperative rent, against the open-market rent you would otherwise sign. Checked on 23 September 2026.
Share money is set by floor area, not by what you earn. The ladder below is the published one at Wohnungsgenossenschaft Treptower Park eG, where one share is 256 euros. Other Berlin cooperatives set their own, so treat it as a realistic starting figure and overwrite it in the next step if you have a real number.
Use net cold rent per square metre on both lines so the comparison is fair. The Berliner Mietspiegel 2026, in force since 28 May 2026, puts the Berlin average for existing tenancies at 7.71 euros. Member companies of the BBU, which is where most cooperative stock sits, averaged 7.10 euros on 30 June 2025. A new open-market contract in Berlin usually costs a good deal more than either, so put in the figure from the listing you are actually looking at.
Cumulative outlay over twelve years. The cooperative line starts high because the share money is paid before you move in, then climbs more slowly. Where the lines cross is the month the cooperative route has paid for itself.
Share ladder and share price: Wohnungsgenossenschaft Treptower Park eG. Notice and settlement rules: the Satzung of Berliner Bau- und Wohnungsgenossenschaft von 1892 eG as amended on 27 November 2024, and sections 65 and 73 of the Genossenschaftsgesetz. Rent anchors: Berliner Mietspiegel 2026 and the BBU Marktmonitor 2025. This is a cost comparison, not financial or legal advice, and it ignores heating and service charges because they land on both routes.