Bremen Rent Increase Laws: Rent Brake, Caps, and Rent Index

Navigating rent increases is one of the most complex areas of landlord-tenant law in Bremen. The state of Bremen has enacted its own stringent regulations—specifically the Rent Brake (Mietpreisbremse) and a lowered Rent Cap (Kappungsgrenze)—that go beyond the federal German Civil Code (BGB). However, these special protections apply exclusively to the city of Bremen, not to Bremerhaven.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed attorney in Bremen for advice specific to your situation. Information last verified: March 2026.

Overview of Rent Increase Rules

Rent Brake (For New Leases)

On December 1, 2025, a new ordinance extended the Rent Brake (Mietpreisbremse) until December 31, 2029, specifically for the city of Bremen.

The Basic Rule

When signing a new residential lease, the requested net cold rent may not exceed 10% above the local comparative rent (ortsübliche Vergleichsmiete).

Rent Brake Exceptions

The Rent Brake does not apply under the following specific conditions:

The Duty to Disclose

If a landlord relies on one of these exceptions, they must inform the prospective tenant unsolicited and in writing before the lease is signed. Failing to disclose the exception prior to the contract signature temporarily invalidates the right to charge the higher rent until the disclosure is retroactively provided.

Rent Cap for Existing Leases (Kappungsgrenze)

City of Bremen: 15% in 3 Years

In the city of Bremen, the state government has lowered the federal cap on routine rent increases for existing tenants. The rent may not increase by more than 15% within any three-year period toward the local comparative rent. On September 1, 2024, this lowered cap was extended for another five years until August 2029.

Bremerhaven: 20% in 3 Years

In Bremerhaven, the standard federal BGB limit applies: landlords may increase the rent by a maximum of 20% within any three-year period.

Requirements for a Routine Rent Increase

1. Lock-in Period (Sperrfrist): At least 12 months must have passed since the previous rent increase (or the start of the lease). Including the notice period, the new rent cannot effectively take place until 15 months have elapsed.
2. Justification: Every rent increase request must be formally justified using:
   • The Qualified Rent Index (available in Bremen city since 2024).
   • Information from at least three comparable apartments.
   • An expert witness report (Sachverständigengutachten).
3. Tenant Consent: The tenant has a reflection period extending until the end of the second calendar month following receipt of the notice. If the tenant does not agree, the landlord must file a lawsuit to substitute consent within three months.

Bremen's Qualified Rent Index

As of January 1, 2024, the city of Bremen implemented its very first qualified rent index (qualifizierter Mietspiegel).

• Validity: The 2024 index was valid until the end of 2025, with an updated version anticipated for January 1, 2026.
• Benefits for Landlords: A qualified rent index is the most legally secure method to justify a routine rent increase under BGB rules. Courts presume that prices listed in a qualified index represent the true local comparative rent.

Rent Increases After Modernization

Independent of the Kappungsgrenze, landlords can execute an extraordinary rent increase after completing modernization measures that save energy (insulation, new heating) or permanently improve living conditions.

Under § 559 BGB, a landlord can permanently add up to 8% of the modernized construction costs to the annual rent, minus the costs for routine maintenance.

Maximum Bounds:

• The rent cannot increase due to modernizations by more than €3.00 per square meter within six years.
• If the base rent is below €7.00/m², the limit is strictly €2.00 per square meter over six years.

Index and Stepped Rent Leases

Instead of adhering to the comparative rent index, landlords can use predefined adjustment lease types:

• Index Rent (Indexmiete - § 557b BGB): The rent is directly tied to the Consumer Price Index (CPI) published by the Federal Statistical Office. Adjustments can occur at most once a year and do not require proof of the local comparative market rent. The Rent Brake still dictates the initial starting rent.
• Stepped Rent (Staffelmiete - § 557a BGB): The contract dictates exact, pre-determined rent increases over the years. The increase must be listed as a specific monetary amount rather than a percentage, and at least one year must pass between increases. While a stepped rent contract is active, routine legal rent increases (Kappungsgrenze) and modernization increases are entirely blocked.

Best Practices for Landlords

• Utilize the Qualified Index: For properties in the city of Bremen, rely heavily on the 2024 (and 2026) qualified rent index to support your rent increase claims in writing.
• Monitor the 15% Cap: Ensure you do not breach the strict 15% over three years limit in the city of Bremen.
• Observe the 12-Month Rule: Never issue a request before exactly 12 months have elapsed since the last adjustment.
• Check the Geography: Confirm whether your property sits within the jurisdiction of the city of Bremen or Bremerhaven.

How Landager Can Help

Landager's platform automatically tracks the 12-month lock-in periods and calculates your maximum allowable rent increase based on whether your property sits under the 15% Bremen cap or the 20% Bremerhaven limit. The software generates perfectly formatted, legally compliant BGB rent increase letters ready to send to tenants.

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