Rent Increase (Mieterhöhung) Limits Under German and Austrian Law (2026 Guide)

What the Law Actually Says About Rent Increases

If you rent an apartment in Germany or Austria, your landlord cannot simply raise the rent whenever they like. Both countries have strict legal frameworks that limit how much and how often rent can go up. In Germany, the key laws are the Bürgerliches Gesetzbuch (BGB) and the Mietrechtsnovellierungsgesetz (MietNovG), which includes the so-called Mietpreisbremse (rent brake). In Austria, the Mietrechtsgesetz (MRG) and the Richtzinsmodell for old buildings (Altbau) set the rules. For newer buildings (after 1945 or 1953 depending on the region), different rules apply. Both systems aim to protect tenants from excessive rent hikes, but they work quite differently.

In Germany, a rent increase is generally allowed only if it does not exceed the local comparative rent (ortsübliche Vergleichsmiete) and must be capped at 20% over three years (15% in some cities with a tight housing market) — this is the Kappungsgrenze. In addition, in areas with a strained housing market (angespannter Wohnungsmarkt), the Mietpreisbremse limits the initial rent to no more than 10% above the local comparative rent. Austria uses a different approach: for old buildings (Altbau, built before 1945 or 1953 depending on the federal state), rent is based on the Richtzins (standard rent), which is adjusted by a factor based on the building's condition, location, and amenities. For new buildings (Neubau), rent is mostly free, but subject to general fairness limits under the MRG.

Both countries also have special rules for index-linked rent (Indexmiete) and graduated rent (Staffelmiete), where increases are tied to inflation or pre-agreed steps. In Germany, an index rent increase is limited to the change in the consumer price index (Verbraucherpreisindex), while in Austria, index clauses in standard rental contracts are regulated by the MRG and must be based on the official consumer price index (VPI).

Step-by-Step: What to Do When You Receive a Rent Increase Notice

Step 1: Check if the Increase Is Allowed by Law

First, determine what type of increase it is. In Germany, a simple rent increase (Mieterhöhung) must be in writing, include a justification (e.g., reference to the local rent index or three comparable apartments), and respect the Kappungsgrenze. In Austria, the increase must be based on the Richtzins (for Altbau) or on an index clause. If the increase is not justified or exceeds legal limits, it is invalid. Look for the specific legal basis stated in the letter.

Step 2: Verify the Time Limit

In Germany, rent can usually be increased only once per year (12-month blocking period) and not within the first 12 months of a new lease (unless otherwise agreed). In Austria, for Altbau, the Richtzins can be adjusted annually based on the VPI, but only if the contract allows it. For other increases, the landlord must wait at least 12 months as well.

Step 3: Compare with the Local Rent Index or Richtzins

In Germany, you can check the Mietspiegel (rent index) for your city or district. Many cities publish an official Mietspiegel online. In Austria, for Altbau, you can calculate the Richtzins using the official formula provided by the Schlichtungsstelle (arbitration board) or the Bundesministerium für Justiz. If the proposed rent is higher than what the index allows, you can object.

Step 4: Respond in Writing

If you believe the increase is unlawful, do not simply ignore the letter. In Germany, you have until the end of the month following the receipt of the increase notice to object (Widerspruch). In Austria, you should contact the landlord in writing and, if necessary, apply to the local Schlichtungsstelle within 14 days. Keep copies of all correspondence.

Step 5: Seek Help from a Tenant Association or Legal Aid

Both countries have strong tenant protection organizations. In Germany, the Mieterverein (tenant association) offers legal advice for a small fee. In Austria, the Mieterschutzverband or Mietervereinigung Österreich provides similar services. They can review your case and help you draft an objection.

Differences Between Germany and Austria

While both countries protect tenants, the systems are not identical. In Germany, the Mietpreisbremse is a nationwide rule, but its application depends on whether a city has declared a “strained housing market.” In Austria, the Richtzins system applies only to old buildings (Altbau) built before a certain date (1945 in most states, 1953 in Vienna). For new buildings, rent is largely unregulated, but the MRG still prohibits “usurious” rent (wucherische Miete) that is grossly disproportionate to the value of the property.

Another key difference: In Germany, the landlord can increase the rent to the local comparative rent even without your consent, as long as they follow the formal process. In Austria, for Altbau, the Richtzins is a fixed maximum, and any increase beyond it is illegal. For new buildings, the landlord can freely set the initial rent, but subsequent increases are limited by index clauses or contractual agreements.

Also, in Germany, the Kappungsgrenze (20% or 15% over three years) applies regardless of the local rent index. In Austria, there is no direct equivalent; instead, the Richtzins is adjusted annually by a factor tied to inflation, but the increase cannot exceed the actual change in the VPI.

FAQ: Common Questions About Rent Increases

1. Can my landlord raise the rent because of inflation?

In Germany, only if you have an index-linked rent contract (Indexmiete). In Austria, index clauses are common in new-build leases and must follow the VPI. For Altbau, the Richtzins is automatically adjusted for inflation, but the landlord must notify you.

2. What is the maximum rent increase in Germany per year?

Under the Kappungsgrenze, the rent can increase by no more than 20% over three years (15% in areas with a tight housing market). This means roughly 6.7% per year in normal areas, but the increase must be justified by the local rent index.

3. Can I refuse a rent increase if my apartment has defects?

Yes, in both countries. If the apartment has significant defects (e.g., mold, broken heating), you can argue that the rent is already too high. In Germany, you may also have a right to reduce the rent (Mietminderung). In Austria, defects can be grounds for challenging the increase before the Schlichtungsstelle.

4. What happens if I don't pay the increased rent?

If the increase is lawful and you don't pay, the landlord can eventually terminate the lease after warnings. If the increase is unlawful, you can pay the old rent and object. Always seek legal advice before refusing to pay.

5. Are there special rules for furnished apartments?

Yes. In Germany, for furnished apartments, the rent can include a surcharge for furniture (Möblierungszuschlag), but this surcharge is also subject to the Kappungsgrenze. In Austria, furnished apartments in Altbau are still subject to the Richtzins, but a reasonable surcharge for the furniture is allowed.

6. Where can I find the official rent index for my city?

In Germany, check your city's official website (e.g., Berlin.de, Muenchen.de) for the Mietspiegel. In Austria, for Altbau, the Richtzins is published by the Bundesministerium für Justiz and can be found at justiz.gv.at. For new buildings, there is no official index, but you can compare with similar apartments.

Official Resources and Legal References

For Germany: The Mietpreisbremse is regulated in § 556d BGB and the Kappungsgrenze in § 558 BGB. The official Mietspiegel for many cities is available at bmwsb.bund.de (Federal Ministry for Housing, Urban Development and Building). For Austria: The Mietrechtsgesetz (MRG) is available at ris.bka.gv.at (Rechtsinformationssystem des Bundes). The Richtzins calculator can be found on the Bundesministerium für Justiz website. For both countries, tenant associations offer free initial advice: mieterverein.de (Germany) and mietervereinigung.at (Austria).

Remember, laws can change, and local regulations may vary. Always consult a qualified legal professional for your specific situation.

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