Vonovia, Data Privacy, and Smart Smoke Detectors: What You Need to Know

Key Points:

• Vonovia installs “Multisensor Plus” smoke detectors, measuring smoke, temperature, humidity, and carbon monoxide
• Data privacy concerns arise from collecting room climate data
• Potential tenant costs: small monthly rent increase for installation
• Legal disputes possible if tenants refuse devices
• Business relevance: DPOs and CTOs should monitor GDPR implications

Vonovia and smart smoke detectors: What do you need to know about data privacy?

The most critical fact first: The new "Multisensor Plus" devices detect more than just smoke; they also measure temperature, humidity, and carbon monoxide. Although Vonovia states that no microphones or cameras are integrated, this indoor climate data allows insights into your personal behavior and presence (e.g., via ventilation cycles). From a data privacy perspective, this is highly sensitive.

The good news for residents: According to the manufacturer, data transmission and app usage only occur with your explicit consent. If you want to reject the installation or data processing entirely, you have legal options. Discover your rights, the associated costs, and what this development means for data compliance.

What Are “Multisensor Plus” Smoke Detectors?

The “Multisensor Plus” smoke detectors from Techem are modern devices that go beyond traditional smoke detection. They also measure:

• Temperature
• Humidity
• Carbon monoxide

These data can be viewed in real time through the “Mein Vonovia” app, but only with the explicit consent of the tenants.

Privacy concerns: Are indoor climate data considered personal data?

The collection of indoor climate data raises data protection questions. Even though Vonovia emphasizes that no microphones or cameras are installed, the collected data can reveal insights into tenants’ behavior. Examples include:

• Frequency of ventilation
• Room usage patterns
• Heating preferences

This type of data can be considered personal data under GDPR, and improper handling can lead to compliance issues.

Real Case Study: How a Tenant in Dortmund Responded

In spring 2025, Vonovia announced the installation of the new multisensor smoke detectors in the Dortmund district of Mengede. This came with a monthly surcharge of €3.42 per apartment, even though the existing smoke detectors were still functional.

Tenant Medea Labudde felt disadvantaged and stated clearly:

“For me, this is just a money-making scheme; I see no need for it.”

Supported by the Dortmund Tenants’ Association, Labudde and other residents formally objected to the measure. The association raised concerns not only about the questionable legitimacy of passing these costs onto tenants but also about the privacy risks of the new devices.

Markus Roeser from the Tenants’ Association emphasized:

“If I don’t want these devices installed in my home, I should object in advance. Tenants should assert their data protection concerns.”

This case shows that tenants do have options, such as filing a formal objection and seeking legal advice.

Costs and Legal Considerations

The installation of the “Multisensor Plus” smoke detectors can be associated with a monthly rent increase of around 6 euros. Vonovia argues that this constitutes a modernization that justifies passing the cost on to tenants. Tenant associations, however, view this critically and question whether the new devices actually represent an improvement or merely generate additional costs.

Business Implications

For companies, particularly those handling tenant or client data, it is essential to:

• Verify lawful data processing under GDPR
• Ensure tenant transparency and consent
• Document data usage and storage practices
• Monitor regulatory updates for compliance risks