Rent Reduction: When You're Entitled – And When You're Not

When Are You Entitled to a Rent Reduction?

Under § 536 Para. 1 BGB, the rent is reduced by law when the rental property has a defect that eliminates or significantly diminishes its suitability for contractual use. This means: you don't need to apply for the reduction – it takes effect automatically once the defect exists and the landlord has been informed.

Requirements for an Effective Rent Reduction

1. Significant defect: The defect must noticeably limit the use of the apartment. Minor issues like a dripping faucet or a squeaky door are not sufficient (so-called trivial damage).
2. Defect notice: You must inform the landlord in writing about the defect without delay. Without a defect notice, there is no right to reduction – and you even risk damages claims from the landlord (§ 536c BGB).
3. No fault of your own: The defect must not have been caused by your own behavior.
4. No knowledge at move-in: If you knew about the defect when signing the contract and signed anyway, your right to reduction is excluded (§ 536b BGB).

Typical Cases Where Rent Reduction Is Justified

• Mold infestation due to structural defects (leaky windows, missing insulation)
• Heating failure during the heating season (October–April)
• Water damage with moisture problems
• Prolonged failure of hot water or electricity
• Significant noise disturbance from construction or defective building systems
• Elevator failure on higher floors
• Pest infestation (cockroaches, rats, bed bugs)

When You Have No Right to Rent Reduction

• Own fault: Mold caused by demonstrably improper ventilation, self-inflicted damage
• Knowledge at move-in (§ 536b BGB): You knew about the defect at move-in and signed the contract anyway
• No defect notice: Without written notification to the landlord, no right to reduction
• Trivial damage: Minor impairments that barely affect the living value (dripping faucet, slightly sticking door)
• Energy renovation (§ 536 Para. 1a BGB): For energy-saving modernization measures, reduction is excluded for the first three months
• Obstructing repairs: If you don't let the landlord or workers into the apartment

Important: Burden of Proof and Documentation

For defects that clearly have structural causes (e.g., mold on exterior walls), the burden of proof lies with the landlord – they must prove the tenant caused the damage. Nonetheless, you should carefully document every defect:

• Photos and videos with dates
• Written defect notice by registered mail
• Witnesses (e.g., neighbors who can confirm the defect)
• Temperature log for heating failure

Checklist Before Reducing Rent

Check these points before you reduce your rent:

1. Is the defect significant (not trivial damage)?
2. Did you not cause the defect yourself?
3. Were you unaware of it at move-in?
4. Have you informed the landlord in writing?
5. Have you given the landlord a reasonable deadline for remediation?
6. Have you documented the defect (photos, log)?

Tip: If all points are answered with yes, there is generally nothing standing in the way of your rent reduction claim. When in doubt, consult a tenants' association or lawyer.