Dispute over Berlin's 2013 rent index: shaky ground for the rent cap

While the federal government finalises the rent cap, the dispute over its calculation basis is escalating in Berlin: the 2013 rent index. For property owners and investors, this creates legal uncertainty affecting rent increases and yield calculations.

Manipulation allegations against the rent index

The property owners' association "Haus & Grund" accuses the government of manipulating the 2013 rent index. The Senate Administration for Urban Development rejects the allegations as "not comprehensible" and points out that "Haus & Grund" itself sat on the working group that produced the index.

Court withdraws qualified status

The Charlottenburg district court denied the 2013 rent index recognition as a "qualified rent index." This has direct consequences for landlords: a qualified index simplifies rent increases up to the local reference rent. Without this status, landlords must provide more elaborate proof, either through three comparable apartments or an expert valuation. The government counters that higher courts have not yet ruled and that the same district court confirmed the qualification in other cases.

Rent cap on shaky ground

The planned rent cap would limit rents on re-letting to a maximum of 10% above the local reference rent. The basis for this calculation is the disputed rent index. "Haus & Grund" considers the draft law unconstitutional. Three law professors at Humboldt University Berlin support this view in a legal opinion. Association president Rolf Kornemann has announced he will seek a review by the Federal Constitutional Court if the law takes effect.

Consequences for owners

For property owners in Berlin, the situation means that any planned rent increase can be challenged more easily. Investors assessing properties in locations such as Mitte or Neukölln face greater uncertainty when projecting future rental income. The market development depends on how these legal questions are resolved.