Rent reduction: How tenants should proceed

What matters when there are defects in a rental flat, and why reducing rent too quickly can be risky.

4 minLegally reviewed: 2026-07-26

Document the defect carefully

A rent reduction generally requires a defect that affects use of the flat. Record what happened, when it happened, and how it affects you.

  • Take dated photos and videos
  • Keep a short record of the disruption
  • Note witnesses where relevant

Notify the landlord with proof

Report the defect promptly and, where appropriate, set a reasonable deadline for repair. Keep proof that you gave notice.

Without notice, it can be harder to enforce rights related to the defect.

Do not guess the reduction amount

The appropriate reduction depends on the individual case, including the type, duration, and severity of the disruption. Comparable cases are only guidance.

Withholding too much can create rent arrears. Significant cases should be assessed before reducing payments.

When a rent reduction may come into question

A rent reduction is not a tool to pressure a landlord into making repairs. It is connected to an actual defect that makes the flat less suitable for its agreed use. The condition of the flat matters more than the label given to the problem. A minor and short-lived defect may be assessed differently from a heating failure in winter or water damage affecting several rooms.

The duration is important as well. Record when the defect began, whether it was continuous or intermittent, and whether its effects changed. For noise, smells, or outages, a diary can be useful: date, time, duration, and the specific disruption make the situation easier to understand later.

Not every inconvenience justifies a reduction. The question is whether the use of the flat is materially affected. If you are unsure, begin by documenting the issue and giving notice rather than relying on a general percentage found online.

How to write a useful defect notice

Describe the defect specifically and factually. A helpful notice identifies the affected rooms, the symptoms you observed, and when the problem started. For mould, this could include the location and size of the affected areas; for heating, measured room temperatures and relevant times. Accusations or assumptions about who is responsible are usually not necessary in the first message.

Ask for a remedy and allow access to the flat where inspection or repair is needed. A deadline can be appropriate, but it should reflect the urgency. Acute hazards or the complete failure of essential facilities require a faster response than a minor, non-urgent issue.

Send the notice in a way that lets you prove receipt and keep copies. The landlord's replies, proposed contractor appointments, and repair attempts should also be kept. These records often show whether and when a remedy was offered.

Handle ongoing rent payments carefully

Reducing too much can have serious financial consequences. It can create arrears and lead to further dispute. Do not simply stop paying rent because there is a defect. Where the cause, extent, or amount of a possible reduction is disputed, legal assessment before reducing payments is especially important.

If in doubt, paying under reservation is often safer than unilaterally reducing the rent. This can help avoid preventable arrears while preserving the option to pursue possible claims after the position has been assessed.

The calculation also depends on which payments are due and what basis is used. Mistakes often arise when tenants do not take account of advance payments, flat-rate charges, or partial repairs already completed. Repair of the defect can also change the period for which a reduction may be relevant.

If you intend to reserve rights or make a payment under reservation, the wording should fit the situation. A standard phrase cannot replace review of the actual tenancy agreement and current demands, particularly if there are already reminders, a threat of termination, or a service-charge demand.

Common mistakes in rent-reduction cases

  • Reducing rent without giving notice: The landlord generally needs a chance to learn about the problem and arrange a remedy.
  • Relying only on phone calls: Without a record, it can be difficult to prove what was reported.
  • Copying percentages from other cases: Cases involving other flats and periods cannot simply be applied to your own situation.
  • Preventing access for repairs: Refusing access without good reason can make a remedy harder and weaken your position.

A structured approach helps both sides: the defect becomes clear, the landlord can respond, and you retain an overview of deadlines, communications, and payments.

When the defect is not resolved

If the landlord does not respond or disputes the cause, an early legal assessment can clarify the next step.

Before seeking advice, it helps to prepare a short chronology: when did the defect first appear, when was it reported, what replies and appointments followed, which rooms are affected, and what payments have been made? It does not need to be perfectly written. The purpose is to ensure important details are not lost in a long chain of messages. Put photos, messages, and any quotes or reports together. If the cause is disputed, do not present assumptions as established facts; describe what you observed. This makes it easier to assess whether a further deadline, evidence preservation, a payment under reservation, or another step is appropriate. Even where an issue has existed for some time, a clear stocktake can be valuable because earlier correspondence and repair attempts may matter.

Clear records also make it easier to identify which questions require an immediate response and which can be resolved through a repair appointment.

Legal foundations and primary sources

The guidance is based in particular on the following official German legislation. The provisions that apply depend on the facts of the individual case.

Related links

  • Checking a service charge statement: What tenants should look for

    A practical guide to reviewing an operating-cost statement, requesting documents, and keeping key deadlines in view.

    Read guide

  • Personal-use termination: What tenants should check now

    How to secure deadlines, assess the stated reasons, and prepare the next steps after a personal-use termination notice.

    Read guide

  • Claiming your rental deposit back: A tenant's guide

    What to document after moving out, how to request an account, and how to respond when a deposit is retained.

    Read guide

Notice: All information on this page does not constitute legal advice and is provided for general informational purposes only.