Challenge Modernization Notice for Tenants in Germany

Modernization & Cost Allocation 2 min read · published September 07, 2025

As an affected tenant in Germany, families often face many questions when they receive a modernization notice for an old building: Which costs may the landlord pass on? Are the announced measures necessary and reasonable? This article explains clearly how to review and, if necessary, challenge a modernization notice. You will learn which deadlines apply, which types of evidence are useful and which official forms may be relevant. I describe practical steps from documentation and sample letters to communication with the landlord and the competent local courts. The goal is for families to know their rights and decide confidently without legal expertise. Concrete examples help with decision making.

What is a modernization notice?

A modernization notice informs about planned measures to improve sustainability or save energy; landlords must state content and start date, the legal basis is found in the BGB [1].

What families should pay special attention to

  • Check deadlines and the start of the measures.
  • Understand which costs the landlord may pass on to tenants.
  • Distinguish between modernizations and repairs.
  • Request detailed plans, cost estimates and proof.
  • Document the apartment condition, defects and communications in writing.
Document all defects with dates and photos.

How to review and challenge

First check the formal requirements of the notice, then economic reasonableness and finally legal options; court proceedings follow the ZPO rules [2].

  • Compare content and scope with the lease and request missing documents.
  • Collect evidence: photos, witnesses, written correspondence.
  • Contact the competent local court or an advice center if unsure.
  • In disputes, courts and the BGH examine relevant case law [3].
Respond within stated deadlines, otherwise rights can be lost.

Frequently Asked Questions

Can I challenge a modernization notice?
Yes, if there are formal errors, unreasonable measures, or incorrect cost statements; start with a written objection and documentation.
Must I stay in the apartment during modernization work?
Only if the measures do not make occupancy unreasonably difficult; significant impairments may allow rent reductions.
Where can I turn for help?
Contact the competent local court, a tenants' association or municipal tenant advisory service for concrete assistance.

How-To

  1. Read the notice immediately and note the date of receipt.
  2. Request detailed cost breakdowns and schedules in writing.
  3. Collect photos, defect reports and witness statements as evidence.
  4. Send a reasoned objection to the landlord and keep a copy.
  5. If necessary, file a lawsuit at the local court or request mediative support.

Key takeaways

  • Observe all deadlines carefully.
  • Documentation increases chances of success in court.
  • Request official proofs and cost transparency.

Help and support


  1. [1] Gesetze im Internet — BGB §§535–580a
  2. [2] Gesetze im Internet — ZPO
  3. [3] Bundesgerichtshof — Decisions
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.