Tenants Report Algorithmic Bias in Germany

As a tenant in Germany, an opaque algorithm used for housing listings, tenant profiles or billing can cause unexpected disadvantages. This practical guide explains in plain language how to spot algorithmic discrimination, which evidence is useful, and how to assert your rights against landlords, property managers or authorities. You get a step-by-step guide for collecting documents, communicating securely, and a template letter you can use right away. We also name the responsible courts and laws, relevant forms and practical examples so you can decide whether a report to authorities or legal enforcement makes sense. We also explain relevant rules such as §§ 535–580a BGB^[1], which forms to find and how the local court handles proceedings so you are prepared.

What to do about algorithmic bias?

First: describe clearly what the disadvantage is. Typical signs are different responses with identical information, systematic rejections of certain groups, or unexplained price increases. Documentation is crucial: date, time, screenshots, emails and all notes about conversations help to prove patterns.

Once you have collected evidence, inform your landlord or the management in writing, describe the specific problem and request an explanation or correction. State that you will consider reporting to the competent authority or taking legal action if necessary.

What to watch for when collecting evidence

• Evidence: systematically collect screenshots, emails, messages and invoices.
• Deadlines: note date and time of every communication to reveal temporal patterns.
• Forms: keep copies of applications, rejections or automated notices safe.
• Contacts: record names and roles of contacts at the landlord or authority.

If an automated system clearly appears discriminatory, you can consider reporting it to the Federal Anti-Discrimination Agency or a suitable state office and simultaneously assert your claim against the landlord. A report helps review the incident and may lead to recommendations.^[3]

Forms and legal steps

For civil actions, the written complaint under the Code of Civil Procedure (ZPO) is relevant; general rules on proceedings are found in the ZPO^[2]. Rental law cases are usually handled by the local court (Amtsgericht); in urgent cases, an application for an interim injunction may be appropriate. A template letter to the landlord should state the demand clearly, set a deadline and announce possible next steps.

FAQ

What is algorithmic bias in housing?

Algorithmic bias refers to systematic disadvantages caused by automated decision processes, for example in listings, scoring or billing.

How can I proceed if I suspect bias?

Collect evidence, request an explanation from the landlord, use our template letter and report the case to a competent authority or consider legal action.

When should I sue instead of reporting?

A lawsuit makes sense if there is demonstrable damage and out-of-court resolution is not possible; check deadlines and costs first.

How-To

1. Collect documentation: screenshots, emails, timestamps and witness statements.
2. Send the template letter: describe the issue, set a deadline and demand correction.
3. Monitor deadlines: document any response within the set timeframe.
4. Inform authority or court: consider reporting to the Anti-Discrimination Agency and preparing a lawsuit if necessary.

Help and Support

• Federal Anti-Discrimination Agency – Hotline and advice
• Civil Code (BGB) – tenancy rules and obligations
• Federal Court of Justice – case law on tenancy

1. [1] Bürgerliches Gesetzbuch (BGB) §§ 535–580a
2. [2] Zivilprozessordnung (ZPO) – Rules of procedure
3. [3] Federal Anti-Discrimination Agency – information and contact