Modernization
A structural improvement that can allow a rent increase.
Tenants generally have to tolerate modernizations (for example energy-efficiency renovation) if they are announced in time. Afterward, the landlord can pass part of the costs on to the rent. Against unreasonable hardships, an objection is possible.
The relevant statutes
§ 555b BGB§ 559 BGB
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General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.