Use Rent Index Correctly for Tenants in Germany

Rent & Rent Control 3 min read · published September 07, 2025

As a tenant in Germany, you often face questions about the rent index, evidence and possible rent increases. This practical guide explains how to evaluate rent index data correctly, which documents serve as evidence and which deadlines must be observed. Without an immediate lawyer you can systematically collect evidence, draft formal objections and, if necessary, prepare a lawsuit at the competent local court. We show step by step which laws and authorities are relevant, which forms may be important and how to improve your chances in negotiations or proceedings. Concrete examples and sample texts help with practical application.

What is the rent index?

The rent index is a local overview of customary local rents. Landlords and tenants use it to assess the appropriateness of a demanded rent. The rent index itself is not a law, but it is an important orientation for disputes about rent increases and contract prices. The legal basis of tenancy law can be found in the German Civil Code (BGB), in particular the provisions on duties and rent increases.[1]

In most regions, tenants are entitled to basic habitability standards.

When is the rent index helpful?

  • Make comparisons based on local comparable values.
  • Check whether the demanded rent is market-appropriate.
  • Observe deadlines for objections or consents.
  • Collect evidence: rental contracts, operating costs, dated photos of condition.
Keep all emails and receipts carefully filed.

Collecting evidence: What counts as proof?

Good evidence strengthens your position. Collect documents systematically that prove condition, payments and communication.

  • Copies of the rental agreement and previous tenancy contracts.
  • Receipts and bank statements showing rent payments.
  • Photos of defects, heating condition or renovation needs with dates.
  • Written communication with the landlord, including reminders or offers.
Detailed documentation increases the chances of success in disputes.

Forms and authorities

In many cases prepared letters and good file management are sufficient, but for court steps the correct forms and jurisdiction matter.

  • Complaint form (civil action) – Used when out-of-court settlement fails; example: you file at the competent local court because the landlord demands an unlawful rent increase.[2]
  • Application for legal aid (PKH) – If you have limited means, you can apply for support with court costs; example: submit a PKH application to the local court to cover costs for an eviction case.[3]
  • Sample texts for objection or justified rent reduction – Use precise wording, state defects and deadlines and document prior notifications.

The competent court for many tenancy disputes is the local court (Amtsgericht). For appeals and precedents, the Federal Court of Justice is relevant.[4]

Respond to landlord letters within set deadlines.

How to draft an objection or rent reduction?

Concrete steps: Describe the defect clearly, provide dates, attach evidence and request a deadline for remediation. If the landlord does not respond, state the legal consequences (e.g. rent reduction) and set a reasonable grace period.

Frequently Asked Questions

What happens if the landlord justifies the rent increase with the rent index?
Check whether the rent index is current and locally applicable and compare with your own evidence; if necessary, file a written objection.
Which evidence is especially relevant at the local court?
Rental agreement, payment records, photos of defects and any written communication are central.
Can I proceed without a lawyer?
Yes, many steps such as collecting evidence, drafting objections and applying for legal aid are possible; for complex cases legal advice is recommended.

How-To

  1. Note important dates and deadlines immediately after receiving landlord letters.
  2. Collect all documents: rental agreement, statements, photos and communication logs.
  3. Draft a written objection or justified rent reduction with evidence and set a deadline.
  4. If necessary, file a lawsuit at the competent local court or apply for legal aid.

Key takeaways

  • Good documentation often matters more than an early lawyer letter.
  • Observe deadlines carefully or you may lose rights.
  • Official forms and court procedures are usable even without a lawyer.

Help and Support


  1. [1] Gesetze im Internet – BGB §§535–580a
  2. [2] Gesetze im Internet – ZPO (Code of Civil Procedure)
  3. [3] Federal Ministry of Justice and Consumer Protection (BMJV) – Information on legal aid
  4. [4] Federal Court of Justice – Decisions and rulings
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.