Contest Rent Increase in Germany: Formal Errors

Rent & Rent Control 2 min read · published September 07, 2025

As a tenant in Germany, you can contest a rent increase if the notice contains formal errors or deadlines were not observed. This article explains in plain language which formal errors commonly occur, how to collect evidence, which deadlines to watch and which official forms may help. I provide practical examples of flawed rent increase notices, step-by-step actions for objection and tips for communication with the landlord. The information refers to the BGB and typical court decisions, and includes guidance on when a lawsuit at the local court (Amtsgericht) may be necessary. The aim is that you as a tenant can recognise your rights in clear steps and act with confidence.

When is a rent increase formally defective?

A rent increase must be properly justified and served; in particular, § 558 BGB regulates rent increases based on comparable rents.[1] Formal errors can render a rent increase ineffective if required information is missing or deadlines are not met.

  • Missing or incomplete written justification of the increase request.
  • Deadlines were miscalculated or the service was not demonstrable.
  • Unclear or incorrect calculation of the new rent or comparison values.
  • Important proofs regarding modernisations or operating costs are missing.
Keep all original letters stored safely.

Examples of formal errors

Example 1: Missing justification

The landlord issues a rent increase but provides no comparable apartments or calculation basis. Without a comprehensible justification, the legal basis for the increase is often lacking.

Example 2: Deadline errors

The rent increase is delivered one day before a deadline expires or without the required notice period. Such deadline errors can make the increase ineffective.

How-To

  1. Gather all relevant documents: rent increase notice, tenancy agreement, payment receipts and photos.
  2. Check the justification in writing for missing comparison details or calculation errors.
  3. Respond within deadlines: send a written objection to the landlord within the specified period.
  4. If no agreement is reached, consider filing a claim at the competent local court; document evidence carefully.
Respond within deadlines to avoid losing rights.

FAQ

Can I reject a rent increase due to formal errors?
Yes. You can object in writing and specify the missing points; in many cases the rent increase then cannot be enforced.
Which deadlines are particularly important?
Pay attention to service deadlines and the landlord's response period; if in doubt, a prompt written reaction helps.
Who decides disputes about rent increases?
Disputes are usually heard first at the local court (Amtsgericht); for interpretation issues, the Federal Court of Justice (BGH) may issue important rulings.[2]

Help and Support / Resources


  1. [1] § 558 BGB — Rent Increase
  2. [2] Federal Court of Justice — Decisions on Tenancy Law
Bob Jones
Bob Jones

Editor & Researcher, Tenant Rights Germany

Bob writes and reviews tenant law content for various regions. They’re passionate about housing justice and simplifying legal protections for tenants everywhere.