The principle: from the landlord's knowledge onwards
Under § 536 BGB the rent is reduced automatically as soon as a significant defect exists. But you can only enforce the claim once the landlord knows about the defect — normally from the moment your notice arrives.
For the time before that the rule is: anyone who knew about the defect and still paid the full rent without reservation generally cannot get the money back.
These four cases allow you to reclaim
- You paid under protest; the claim for repayment then survives in full
- The landlord already knew about the defect, for instance because he saw it himself or the whole building was affected
- The landlord stated the floor area incorrectly; in that case the claim exists from the start of the tenancy
- The tenancy agreement contains an invalid clause that kept you from reducing the rent
Do not underestimate the last point. Older agreements in particular often contain clauses meant to exclude the right to reduce. For residential lettings such clauses are void under § 536 Abs. 4 BGB, and yet tenants have overpaid for years because of them.
Forfeiture: when waiting too long costs the claim
If you pay the full rent without reservation over a long period although you know about the defect, the right to reduce can be forfeited in exceptional cases. The formerly common benchmark of six months, however, comes from case law on § 539 BGB in its old version, repealed in 2001, and no longer applies in that form: in 2003 the Federal Court of Justice held that paying without reservation while aware of the defect does not cause a loss of rights by analogy with § 536b BGB.
In law, forfeiture needs two ingredients. The time element: a considerable period has passed. And the circumstances element: the landlord was entitled to conclude from your conduct that you would no longer reduce. Only both together cost you the claim.
Limitation periods at a glance
| Period | Length | When it starts |
|---|---|---|
| Standard limitation of the repayment claim | 3 years | End of the year in which the claim arose and you learned of it |
| Absolute limitation | 10 years | When the claim arose, regardless of knowledge |
| Forfeiture of the right to reduce (§ 242 BGB) | no fixed benchmark, exceptional case | Knowledge of the defect while paying without reservation |
How to proceed when reclaiming
- 1Determine the period and the rate and set out a calculation that can be followed.
- 2Gather your evidence: the defect notice, photos, logs, correspondence, bank statements.
- 3Demand repayment from the landlord in writing, with a specific deadline of around 14 days.
- 4If refused, involve a tenants' association or a specialist lawyer; often a solicitor's letter is enough on its own.
- 5Before the limitation period expires, consider court steps, if need be via an order for payment (Mahnbescheid), which suspends limitation.
Frequently asked questions
Can I reduce the rent retroactively?
Only to a limited extent. It is possible if you paid under protest, the landlord already knew about the defect, the floor area was stated incorrectly, or an invalid contract clause kept you from reducing.
How far back can I reclaim rent?
Within the standard limitation period of three years, counted from the end of the year in which the claim arose and you knew about it. Independently of that, the claim ends after ten years at the latest.
Do I lose my right to reduce if I do nothing for a long time?
Only exceptionally. The six-month limit once quoted rested on repealed law; today forfeiture only comes into play via § 242 BGB and requires the time and circumstances elements together. You should still act promptly — if only because of the evidence and the three-year limitation period.
Does anything different apply if the floor area was wrong?
Yes. If the actual floor area falls short by more than ten percent, the claim exists from the start of the tenancy under the case law of the Federal Court of Justice, and without a prior defect notice at that, because the landlord is responsible for the incorrect statement himself.
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Start now for freeMore guides
- Writing a defect notice (Mängelanzeige): template, required details and deadlines
- Calculating a rent reduction: formula, examples and the basis of calculation
- Paying rent under protest: the safe route to a rent reduction
- When a rent reduction is excluded: 7 grounds
- The 10 most common mistakes in reducing rent
- Serving a defect notice: email, letter or registered post?
- The landlord is not responding to the defect notice: what you can do now
This article provides general information and does not constitute legal advice (Rechtsberatung). Despite careful research, no guarantee can be given for accuracy, completeness or timeliness. For specific legal questions, contact a tenants' association (Mieterverein) or a lawyer specialising in rental law.