Mietpreisbremse Explained: Rent Control Rules Every German Landlord Must Know (2026)

Germany’s Mietpreisbremse (rent brake) is one of the most impactful, and most misunderstood, regulations for landlords. It caps how much rent you can charge when re-letting an apartment, and violations carry financial penalties that can wipe out years of rental income. Yet many investors buy properties without checking whether the Mietpreisbremse applies to their location, calculate yields based on market rents they’re legally not allowed to charge, and only discover the problem when a tenant sends them a Rüge.

This guide covers how the rent brake works, where it applies, what’s exempt, and how to factor it into your investment decisions.

What the Mietpreisbremse actually does

The Mietpreisbremse was introduced in June 2015 through §§ 556d–556g BGB. Its core rule is simple:

When re-letting an existing apartment, the new rent may not exceed the ortsübliche Vergleichsmiete (local comparable rent) by more than 10%.

The ortsübliche Vergleichsmiete is determined by the local Mietspiegel (rent index), a standardised table published by most German cities that reflects typical rents for comparable apartments based on size, age, condition, and location.

Example: The Mietspiegel says the comparable rent for your 70 m² apartment in Berlin-Kreuzberg is €9.50/m². The maximum rent you can charge a new tenant is €9.50 × 1.10 = €10.45/m², or €731.50 Kaltmiete per month, regardless of what the market would actually bear.

If similar apartments on ImmoScout are listed at €13/m², you cannot charge that. The Mietpreisbremse overrides the market.

Where the Mietpreisbremse applies

The Mietpreisbremse is not a federal blanket rule. It only applies in areas that state governments have designated as angespannte Wohnungsmärkte (tight housing markets) through a Rechtsverordnung (statutory instrument). Each designation is valid for a maximum of 5 years and must be renewed.

As of 2026, the Mietpreisbremse applies in most major cities and many surrounding municipalities:

Not covered: Most rural areas, smaller towns, and some eastern German cities where the housing market is not classified as tight. In these areas, you can set rents freely at re-letting (subject only to the general Mietwucher prohibition under § 5 WiStG).

Critical step before buying: Check whether the specific municipality is covered by a current Mietpreisbremse-Verordnung. These are published in each state’s official gazette (Gesetzblatt) and are available through the state government’s website. The designation can expire and not be renewed, or new areas can be added.

What’s exempt from the Mietpreisbremse

Several important categories of rental properties are fully exempt. If your property falls into one of these, you can set the initial rent freely.

1. New builds (Neubau): § 556f Satz 1 BGB

Apartments that are used and rented for the first time after October 1, 2014 are exempt from the Mietpreisbremse. This applies to:

• Completely new constructions
• Buildings that were previously non-residential and converted into apartments for the first time
• Buildings that were uninhabitable and comprehensively reconstructed to the point of being considered “new”

The exemption is permanent, it doesn’t just apply to the first tenant. Every subsequent re-letting of a post-2014 new build is also exempt. This makes new builds significantly more attractive for investors in Mietpreisbremse areas, as they retain full pricing flexibility.

Watch out: The exemption attaches to the first use as residential space, not the construction date. If a building was completed in 2016 but first rented out in 2013 as part of a phased development, the exemption may not apply. The date of first use and occupancy is what counts.

2. Comprehensive modernisation (umfassende Modernisierung): § 556f Satz 2 BGB

If you carry out a comprehensive modernisation before re-letting, the apartment is treated like a new build and the rent brake does not apply to the first letting after the work is completed.

But “comprehensive” has a high bar. Courts have established that the modernisation must be so extensive that the apartment is essentially comparable to a new build in terms of quality and condition. The BGH has indicated that this typically requires:

• Investment of approximately one-third of the cost of a comparable new build (excluding land)
• Work affecting multiple core elements: heating, windows, electrical systems, plumbing, bathroom, kitchen, flooring, insulation
• The result must represent a qualitative leap, not just cosmetic renewal

Simply renovating the bathroom and painting the walls does not qualify. A full gut renovation with new heating, new windows, new electrical system, new bathroom, and new flooring likely does.

Documentation is critical. Keep all invoices, contracts, and before/after records. If a tenant challenges your rent and you claim the modernisation exemption, you’ll need to prove the scope and cost of the work.

3. Previous rent above the cap (Vormiete): § 556e Abs. 1 BGB

If the previous tenant’s rent was already above the Mietpreisbremse cap, you can charge the new tenant at least the same amount, even if it exceeds the ortsübliche Vergleichsmiete + 10%.

Example: The Mietspiegel-based cap is €10.45/m², but the previous tenant was paying €11.50/m² (perhaps set before the Mietpreisbremse was enacted, or under an exemption). You can charge the new tenant up to €11.50/m².

You cannot, however, increase beyond the previous rent using this exception, it only preserves the status quo.

4. Modernisation surcharge in the previous 3 years (Modernisierungsumlage): § 556e Abs. 2 BGB

If you carried out a non-comprehensive modernisation within the three years before re-letting, you can add the modernisation surcharge (Modernisierungsumlage) on top of the Mietpreisbremse cap, even if this pushes the total above the 10% limit.

The surcharge follows the standard rules of § 559 BGB: the landlord can pass on 8% of the modernisation costs per year to the tenant (reduced from 11% for apartments in Mietpreisbremse areas). The Kappungsgrenze limits the increase to €2/m² within 6 years (or €3/m² if the previous rent was above €7/m²).

How the Mietpreisbremse is enforced

The Rüge: tenant’s formal complaint

Unlike most German regulations, the Mietpreisbremse is not self-enforcing. It only kicks in when the tenant takes action. The process:

1. Tenant sends a Rüge (formal written complaint), The tenant must inform the landlord in writing (Textform) that the rent exceeds the permitted level and state the reasons. Since the April 2020 reform, a simple notification is sufficient, the tenant no longer needs to provide detailed calculations or Mietspiegel references.

2. Landlord must respond, Within the response, the landlord should either justify the rent (citing an exemption) or reduce it.

3. Excess rent is refundable, The tenant can reclaim all rent paid above the permitted level from the date the Rüge was sent (not from the start of the tenancy, the pre-Rüge overpayment is lost to the tenant).

Financial consequences for landlords

The consequences are purely financial, there are no criminal penalties for Mietpreisbremse violations. But the financial impact can be substantial:

Scenario: You charge €12/m² for a 70 m² apartment. The permitted rent is €10.45/m². The tenant sends a Rüge after 6 months.

• Overpayment per month: (€12 - €10.45) × 70 = €108.50
• You must reduce the rent to €10.45/m² going forward
• You must refund all overpayments from the Rüge date onward
• If the tenant stays 5 more years after the Rüge: €108.50 × 60 = €6,510 in lost rental income compared to your original calculation

That’s €6,510 that was probably in your yield projection when you bought the property.

The Auskunftspflicht: mandatory disclosure

Since the 2019 reform, landlords have a proactive disclosure obligation (§ 556g Abs. 1a BGB). Before or at the time of signing the rental contract, you must inform the tenant in writing if your rent exceeds the Mietpreisbremse cap and state the reason, for example:

• “The previous tenant’s rent was €X/m² (§ 556e Abs. 1 BGB)”
• “The apartment was first used after October 1, 2014 (§ 556f Satz 1 BGB)”
• “A comprehensive modernisation was completed in [year] (§ 556f Satz 2 BGB)”

If you fail to disclose, the exemption still exists, but you cannot rely on it until you’ve provided the information. Any rent above the cap collected before proper disclosure must be refunded upon a Rüge, even if an exemption technically applies.

Mietpreisbremse vs. Kappungsgrenze: two different limits

These are often confused. They are separate mechanisms:

The Kappungsgrenze limits how much you can raise rent for an existing tenant, even if the rent is below the Mietspiegel level. In designated areas, the cap is 15% within three years (instead of the standard 20%). Both limits can apply simultaneously: the Mietpreisbremse constrains the starting rent, and the Kappungsgrenze constrains subsequent increases.

How the Mietpreisbremse affects your rental yield

This is where many investors get their calculations wrong. If you’re buying in a Mietpreisbremse area, your yield projection must use the legally permitted rent, not the market rent.

Example calculation

Property: 65 m² apartment in Munich (Mietpreisbremse applies) Purchase price: €400,000 Closing costs: €44,000 (11% for Bavaria) Total investment: €444,000

The difference between the market rent yield (3.34%) and the legally permitted yield (3.00%) is 0.34 percentage points, or roughly €1,520 per year in gross income you cannot legally collect. Over 10 years, that’s €15,200.

After deducting non-allocable operating costs, financing costs, and vacancy, the net yield difference is even more significant in percentage terms because the cost base remains the same.

Use our rental yield calculator with the Mietpreisbremse-adjusted rent, not the market rent. Enter the ortsübliche Vergleichsmiete + 10% as your expected rent. Anything above that is revenue you may have to refund.

How to find the ortsübliche Vergleichsmiete

The Mietspiegel is your primary reference. There are two types:

Qualifizierter Mietspiegel (qualified rent index)

Created according to recognised scientific principles (§ 558d BGB). Valid for 4 years (extended from 2 years by the 2022 reform), updated after 2 years. It has legal presumption of accuracy, in a dispute, the court will accept it unless the opposing party provides a compelling expert opinion.

Most major cities have a qualifizierter Mietspiegel: Berlin, Munich, Hamburg, Cologne, Frankfurt, Stuttgart, and many others. These are typically available online through the city’s website, sometimes as an interactive calculator.

Einfacher Mietspiegel (simple rent index)

Not created to the same scientific standard. It provides orientation but has no legal presumption. Either party can challenge it more easily in court.

No Mietspiegel available?

In smaller municipalities without a Mietspiegel, the ortsübliche Vergleichsmiete can be determined through:

• Three comparable apartments (Vergleichswohnungen), the landlord or tenant identifies three similar apartments with their rents
• Expert opinion (Sachverständigengutachten), a qualified surveyor determines the comparable rent
• Mietdatenbank, a database maintained by the municipality or landlord/tenant associations

In practice, the absence of a Mietspiegel makes enforcement harder for tenants but doesn’t eliminate the Mietpreisbremse obligation.

Practical strategies for landlords

Before buying

1. Check if the Mietpreisbremse applies in the specific municipality, not just the city, but verify the current Verordnung is still in force and when it expires.

2. Look up the Mietspiegel for the exact location and apartment type. Calculate the maximum permitted rent (Mietspiegel + 10%) and use that, not the asking rents on portals, in your yield calculation.

3. Consider new builds, the permanent exemption from the Mietpreisbremse is a genuine financial advantage. Run the numbers with our rental yield calculator to compare a new build at market rent vs. an existing build at the capped rent.

4. Factor in the Kappungsgrenze for long-term projections. Even if you start at the maximum permitted rent, future increases are limited to 15% within three years (in designated areas). Your rent growth projections should reflect this constraint.

When re-letting

1. Calculate the permitted rent before listing the apartment. Use the current Mietspiegel, apply the correct category for your apartment (size, age, condition, location), and add 10%.

2. Check if an exemption applies, new build, comprehensive modernisation, or previous rent above the cap. If it does, document it thoroughly.

3. Fulfil your disclosure obligation, inform the tenant in writing before or at contract signing if the rent exceeds the cap and state the legal basis for the exception.

4. Keep records, Mietspiegel printout, previous tenant’s rent agreement, modernisation invoices, first-use documentation. If a Rüge arrives in year three, you’ll need these.

If you receive a Rüge

1. Don’t ignore it. The Rüge triggers the refund obligation, every month you delay costs you more.

2. Check if an exemption applies. If it does, respond with the documentation. If you failed to disclose the exemption at contract signing, provide the information now, you can rely on the exemption going forward, but you may owe refunds for the period before disclosure.

3. If no exemption applies, reduce the rent to the permitted level immediately and refund the overpayment from the Rüge date.

4. Get legal advice for complex cases, the interaction between Vormiete, modernisation surcharges, and Mietspiegel categories can be nuanced.

The political outlook: will the Mietpreisbremse be extended?

The Mietpreisbremse was originally set to expire in 2025. It has been extended through 2028 by the current legislative framework. Political discussions about making it permanent, or strengthening it further, are ongoing.

Key developments to watch:

• Permanent Mietpreisbremse, several parties advocate for removing the expiration date entirely. If enacted, this would make rent control a permanent feature of German housing law.
• Tightening the cap, proposals to reduce the premium from 10% to 5% above the ortsübliche Vergleichsmiete have been discussed but not yet legislated.
• Expanding the Mietspiegel obligation, the 2022 reform already required all municipalities with more than 50,000 inhabitants to create a Mietspiegel. Further expansion to smaller municipalities would make enforcement easier.
• Retroactive refund claims, under current law, tenants can only reclaim overpayments from the Rüge date. Some proposals would allow retroactive claims from the start of the tenancy, significantly increasing landlord liability.

For investment planning, assume the Mietpreisbremse will remain in force for the foreseeable future. Building your financial model around its expiration is a bet you’re likely to lose.

Key takeaways

• The Mietpreisbremse caps re-letting rent at the ortsübliche Vergleichsmiete + 10% in designated areas, and most German cities are designated.

• New builds (post-October 2014) are permanently exempt, a significant advantage for investors. Comprehensive modernisations also trigger an exemption, but the bar is high.

• Violations mean refunds, not fines, but the financial impact of returning months or years of excess rent can be severe. Disclose exemptions proactively to protect yourself.

• Your yield projection must use the capped rent, not the market rent. Use our rental yield calculator with realistic, legally permitted figures.

• Check the Mietspiegel before you buy, not after. The 10 minutes it takes to look up the ortsübliche Vergleichsmiete can prevent a purchase decision based on rent you’re not allowed to charge.

Once you know your permitted rent, calculate the full picture: acquisition costs with our closing cost calculator, financing with our mortgage calculator, depreciation with our AfA calculator, and the ongoing costs covered in our guide to hidden ownership costs.