Lease Increase Notice Template for Germany

A Lease Increase Notice (Mieterhöhungsverlangen) is your formal tool as a landlord to request higher rent from tenants in Germany's regulated rental market. Under German Civil Code provisions BGB § 557-558b, this document must meet stringent legal requirements to be valid and enforceable.

When do you need this document?

You need this notice when your current rent falls below local market rates and you want to increase it up to the comparative rent level. This commonly occurs after the initial lease period when market rents have risen, when you've completed property improvements that justify higher rent, or when local rent indices show your property is undervalued. The notice is also essential when you're managing multiple properties and need to standardize rents across similar units, or when economic conditions have changed significantly since the last rent adjustment.

Key legal considerations

Your rent increase notice must include one of three legally recognized justification methods: reference to the local rent index (Mietspiegel), comparison with at least three similar properties, or an expert rental valuation. You can only issue this notice once every 15 months, and increases are capped at 20% over three years (15% in rent-controlled areas under Mietpreisbremse regulations). The notice must specify the current rent, proposed new rent, effective date, and detailed justification with supporting evidence. Critical timing requirements include giving tenants exactly three months to respond and ensuring the increase doesn't exceed local comparative rent levels. Failure to meet these requirements can invalidate your notice and delay rent increases significantly.

Legal requirements in Germany

German law mandates specific formal requirements for your rent increase notice under BGB § 558a. The document must be in writing, clearly identify the property and parties, and state the exact rent increase amount with comprehensive justification. You must reference current local rent data, whether from official Mietspiegel reports, comparable property evidence, or certified expert opinions. The notice requires precise calculation showing how the new rent aligns with local market rates and must include all supporting documentation. Additionally, you must comply with local Mietpreisbremse regulations in designated urban areas, which may further limit increase percentages. The tenant has three months to accept or reject the increase, and if rejected, you may need to pursue enforcement through specialized housing courts (Amtsgericht).