View and use the rent index: how to check your rent

The rent index shows the customary local comparative rent for apartments of similar type, size, fit-out and location. It is the most important tool for placing a rent increase or your own rent in context. Many towns and municipalities publish it online or through the housing office.

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A rent increase up to the customary local comparative rent must be justified by the landlord, for example with the rent index, three comparable apartments or an expert report (§ 558a BGB). The qualified rent index carries particular weight here.

With the rent index you can calculate for yourself whether the demanded rent is within range. If it is clearly above, you do not have to agree to an increase without more.

What you should do now

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1. Obtain the rent index
Look for the current rent index of your town, online, at the housing office or at the local tenants' association.
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2. Classify the apartment
Determine the year of construction, size, location and fit-out of your apartment and find the matching field in the rent index.
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3. Check the range
Compare your net cold rent per square meter with the range in the rent index and note additions and deductions.
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4. React to any deviation
If an increase is above the comparative rent or is formally flawed, you can object to your consent in writing and with reasons.

How to spot the scam

The rent increase is not justified at all or only in a blanket manner.
An outdated rent index or one for a different town is used.
The capping limit (at most 20 or 15 percent over three years) is exceeded.

Frequently asked questions

What is the customary local comparative rent?

It is the usual rent for comparable housing in the area, by type, size, fit-out, condition and location. It results from the rents agreed or changed in recent years and is reflected in the rent index.

Do I have to agree to a rent increase?

With an increase up to the customary local comparative rent you do not have to actively agree if it is justified and correctly reasoned; it then applies after the consideration period expires. If it is flawed or too high, you can object.

What is a qualified rent index?

A rent index created according to scientific principles and recognized by the municipality. In court it has a stronger presumptive effect than a simple rent index and is therefore a good argument in disputes over the rent level.

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General information for self-help, not legal advice (RDG). In case of a high loss or uncertainty: contact a consumer advice center or a lawyer.