How Much Rent Increase Is Allowed in Germany?
Calculate the maximum legal rent increase under §§ 558, 559 BGB — Kappungsgrenze (cap), local reference rent and modernisation surcharge.
Current rent & flat
Reference rent (Mietspiegel)
Rough guide: Berlin ~ €11, Munich ~ €21, Hamburg ~ €14, Cologne ~ €13, Frankfurt ~ €16, Leipzig ~ €8, rural ~ €7–10. Use the local Mietspiegel for exact figures.
Last increase
Modernisation (optional)
§ 559 BGB: 8 % p.a. of the investment can be added to the annual rent.
- New maximum rent (€/month)
- €910.00
- Maximum increase
- €110.00
- Current rent per m²
- 11.43 €/m²
- New maximum rent per m²
- 13.00 €/m²
- Local reference rent (total)
- €910.00
- Cap (Kappungsgrenze) upper bound
- €960.00
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Calculation basis
| Item | Value |
|---|---|
| Current cold rent | €800.00 |
| Current rent per m² | 11.43 €/m² |
| Floor area | 70 m² |
| Local reference rent (€/month) | €910.00 |
| Cap upper bound | €960.00 |
| Maximum increase | €110.00 |
| New maximum rent (€/month) | €910.00 |
Note: Legal basis: §§ 558, 559 BGB. The Kappungsgrenze (20 % / 15 %) caps the rise within 3 years. The maximum legal rent is always the lower of the cap and the local reference rent. The Mietspiegel varies strongly by city, area and flat type — the calculator gives an orientation, not legal advice.
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Background
Rent Increases in Germany 2026: Kappungsgrenze, Reference Rent and §559 BGB Explained
10 Min.