Rent Reduction in Germany 2026: Table, Court Rulings & Template

Broken Heating, Mold on the Walls — What Can You Actually Do?

Picture this: It's minus five outside, your heating has been dead for three days, and your landlord isn't picking up the phone. You're sitting on the couch wrapped in blankets, wondering — do I really have to pay full rent for this?

Short answer: No. German rental law gives you the right to reduce your rent when your apartment has a defect. It's called Mietminderung, and it kicks in automatically.

How Mietminderung Works

Section 536 of the German Civil Code (BGB) says: If your apartment has a defect that limits its use, you pay less. You don't need your landlord's permission, a lawyer, or a court order. The rent reduction applies by law — the Federal Court of Justice (BGH) confirmed this explicitly (BGH, decision of 25.10.2011 — VIII ZR 125/11).

The reduction is calculated based on your gross warm rent (Bruttowarmmiete) — that's your cold rent plus utilities (BGH, judgment of 06.04.2005 — XII ZR 225/03).

But First: Tell Your Landlord

Before you reduce your rent, you must report the defect. Section 536c BGB requires this. If you don't report it and the damage gets worse, you could end up liable.

Send an email or letter. Describe what's broken, since when, and set a deadline — 3 days for emergencies (heating in winter), up to 4 weeks for minor issues. Send it by registered mail or with a read receipt, in case things go to court later.

What Other Tenants Have Won — Real Court Decisions

These percentages aren't theoretical. They come from actual German court rulings:

Heating failure in winter:

• 70% reduction — Complete heating failure. Tenants had to use gas heaters to get by. (LG Berlin, judgment of 29.07.2002 — 61 S 37/02)
• 50% reduction — Heating failed completely during December through February. (LG Kassel, decision of 24.02.1987 — 1 T 17/87)
• 5% reduction — Heating was out, but the apartment still reached 18°C from other sources. (LG Berlin, judgment of 07.07.1992 — 63 S 142/92)

Mold:

• 20–50% reduction depending on severity. One room = less. Multiple rooms = significantly more.
• Important: The landlord must prove that you caused the mold through improper ventilation — not the other way around.

Other common defects:

Defect	Typical reduction
No hot water	10–30%
Persistent construction noise (neighboring property)	10–25%
Cockroaches or rats	10–25%
Broken elevator (upper floors)	5–15%
Damp basement	5–10%
Broken stairwell lighting	3–5%

One important limit: A brief heating outage of a few hours counts as a trivial defect — no reduction allowed (Section 536(1) sentence 3 BGB). Same goes for a heating system that doesn't run at full power but still reaches 20°C in the rooms (LG Berlin, judgment of 09.12.1991 — 62 S 273/91).

A Quick Calculation

Your gross warm rent is €950. The heating in your living room has been broken for three weeks, but the other rooms work fine. Courts would likely set the reduction at 15–20%.

At 20%: €950 × 0.20 = €190 less per month, for as long as the defect persists.

The Most Common Mistake: Reducing Too Much

If you overestimate and reduce more than you're entitled to, you accumulate rent arrears. And once you're two months behind, your landlord can terminate the lease without notice (Section 543(2) No. 3 BGB). That's where a legitimate complaint turns into an existential problem.

When in doubt, reduce conservatively and add "unter Vorbehalt wegen Mangel" (under reservation due to defect) to the bank transfer reference. This protects your rights without creating a termination risk.

When Mietminderung Doesn't Apply

• You caused the defect yourself (e.g., water damage from a forgotten bathtub)
• You knew about it when you moved in and signed the lease anyway (Section 536b BGB)
• The defect is so minor that it doesn't meaningfully affect daily use

When to Get Help

For a dripping faucet, you don't need a lawyer. But if your landlord denies the defect, threatens termination, or has been ignoring repairs for months — that's different.

First option: your local Mieterverein (tenant association, ~€60–90/year for unlimited advice). Or a specialist rental law attorney — initial consultation costs €50–150.

And before spending any money: try MieterHelfer.

Why We Built MieterHelfer

German rental law is complex — 536 sections in the BGB, hundreds of court rulings, and every case is different. When you need a quick assessment as a tenant, your options are limited: wait weeks for a consultation or spend hours in forums full of outdated advice.

MieterHelfer solves exactly this problem. Describe your situation — for example, "heating broken for 5 days, landlord not responding" — and get a well-founded initial assessment within seconds. The app knows the current case law, explains your options, and tells you specifically what rent reduction is realistic and what steps to take next.

It's free to use and requires no registration. MieterHelfer doesn't replace a lawyer — but it helps you ask the right questions before you need one.