Legal situation
Legal situation & liability in detector replacement
Who is responsible if detectors are not replaced on time? What applies with regard to the building control authority, the insurer and the public prosecutor’s office – and who is allowed to replace detectors at all?
Legal situation & liability
Is detector replacement mandatory?
Yes – if your fire alarm system or fire warning system is required under building law. This is the case if the system is prescribed, for example, in the building permit, in the fire protection concept or by a special building regulation (Sonderbauverordnung). It must then be operated and maintained in accordance with the generally recognised rules of technology, i.e. DIN 14675 and DIN VDE 0833-1/-2, or DIN VDE V 0826-2 for fire warning systems. This includes the replacement of automatic detectors within the prescribed intervals.
What happens if the deadlines are not met?
A system with overdue detectors no longer meets the requirements. As a result, the building no longer complies with the conditions of the building permit. This will be noticed at the latest during the recurring inspection by approved inspection experts. The building control authority can then order measures – up to and including prohibiting the use of the building.
Who is liable?
- Building owners are responsible for ensuring that the building complies with the requirements of building law, and bear the duty of care (to ensure safety).
- Operators of the fire alarm system must ensure proper operation and maintenance and be able to prove this, for example by means of the logbook.
- Appointed operating personnel can be held personally responsible if they fail to fulfil the duties assigned to them.
If a fire breaks out and the system fails because of overdue detectors, civil claims for damages may follow. Where people are injured, criminal investigations against those responsible are also possible. In addition, the insurer may reduce or refuse its payment if contractual maintenance obligations have been breached.
Liability towards insurers
For buildings with a fire alarm system, the system is often part of the insurance contract – as a prerequisite for insurance cover or as grounds for a premium discount. The contracts then contain safety regulations, such as maintenance in accordance with DIN 14675 / DIN VDE 0833 or VdS guidelines by a specialist company. If these obligations (Obliegenheiten) are breached, there are consequences:
- Reduction of benefits or release from the obligation to pay (§ 28 VVG): In the case of an intentional breach, the insurer does not have to pay. In the case of gross negligence, it may reduce its payment according to the severity of the fault – the policyholder must prove that there was no gross negligence.
- Causation: The insurer remains obliged to pay only if the policyholder proves that the breach of obligation did not cause the damage – for example because the detectors triggered in time despite the expired deadline. Without a logbook and reports, this proof is hardly possible.
- Termination (§ 28 (1) VVG): In the event of an intentional or grossly negligent breach of obligation, the insurer may terminate the contract without notice within one month.
- Increase in risk (§§ 23 ff. VVG): A system that has been switched off or is not functional may constitute an increase in risk that must be notified to the insurer. If it is concealed, a reduction of benefits or release from the obligation to pay may likewise follow.
- Causing the insured event through gross negligence (§ 81 VVG): Anyone who knowingly continues to operate with overdue or defective detectors runs the risk that the insurer will regard the damage as having been caused by gross negligence and reduce its payment.
- Recourse: If the building or fire insurer pays, it can take recourse against those responsible – for example the operator, a tenant or a maintenance company that has breached its duties. Business liability insurance does not usually cover intentional breaches of duty.
Tip: Check the safety regulations in your insurance contract and provide the insurer with maintenance records and replacement reports on request.
Who is allowed to replace detectors?
In short: for fire alarm systems required under building law, only a specialist company certified to DIN 14675. DIN 14675 requires that planning, design, installation, commissioning, acceptance and maintenance be carried out by specialist companies that have demonstrated their competence for the respective service phase through certification to DIN 14675-2 (e.g. by VdS, TÜV or DEKRA). Detector replacement and any repair are part of maintenance.
- What counts as maintenance? Replacement of detectors, repair and fault clearance, annual servicing, and modifications and extensions to the system. This work belongs in the hands of a specialist company certified for the maintenance phase, or its qualified personnel.
- What may the operator do themselves? The quarterly inspection (visual check for contamination, damage or changed room use) may also be carried out by a person instructed by the operator. Replacing or repairing detectors is not part of this.
- What happens if a non-certified company does the work? The system is no longer considered to be maintained in accordance with the generally recognised rules of technology. The approved inspection expert may record this as a defect during the recurring inspection, the fire brigade may call the connection into question under its technical connection conditions (TAB), and the insurer may invoke a breach of obligation (see above).
- Where is certification a binding requirement? Directly from DIN 14675 and, as a rule, via the building permit and fire protection concept, the fire brigade’s TAB for connected systems and the insurer’s safety regulations (for VdS systems, additionally VdS-approved installers).
- Manufacturer restrictions: Many panels may only be programmed by authorised partners of the manufacturer. For a straightforward replacement of detectors of the same type, this is often not necessary; for software changes or a change of detector series, it usually is.
- Fire warning systems to DIN VDE V 0826-2 are not covered by DIN 14675; here the standard requires a qualified specialist for fire warning systems. What the building permit requires is decisive.
Liability if the caretaker replaces detectors
Caretakers or building technicians are generally not qualified specialists under DIN 14675. If they replace or repair detectors, the system is no longer maintained in compliance with the rules – with consequences for everyone involved:
- Operator / owner: Anyone who assigns work on the fire alarm system to an unqualified person is liable for fault in selection and organisation (§ 831 BGB, duty of care). Within a company, a breach of supervisory duty under § 130 OWiG may also come into consideration.
- The caretaker personally: If his intervention results in a fire being detected too late, he may himself be liable to third parties (§ 823 BGB) and, where people are injured, face criminal prosecution (§§ 229, 222 StGB). As an employee, his liability towards the employer is limited – but this does not protect him against injured parties or the public prosecutor’s office.
- External caretaker service: Its business liability insurance usually only covers the agreed activities. Work on fire alarm systems without the relevant qualification is often not insured – the risk then remains with the service provider and the client.
- Building and fire insurance: The insurer may regard maintenance by an unqualified person as a grossly negligent breach of obligation and reduce or refuse its payment (§ 28 VVG, see above).
- Manufacturers and approved inspection experts: Incorrectly fitted detectors, bases or programming will be identified as defects during the recurring inspection; warranty and guarantee claims against the manufacturer or installer may lapse.
What the caretaker is allowed to do: As a person instructed by the operator, he may carry out the quarterly inspection, keep the logbook, report faults and irregularities to the specialist company and – after instruction – operate the panel within the scope of operator-level functions (e.g. acknowledge and reset alarms). Replacing detectors, disabling detector zones for extended periods or interfering with detectors, bases and wiring are not part of this.
Before commissioning a company, ask to see its valid DIN 14675 certificate covering the “maintenance” phase. The certificates can be verified online with the respective certification body (VdS, TÜV, DEKRA).
Penalties and fines
| Violation | Legal basis | Possible consequence |
|---|---|---|
| Failing to have the prescribed inspection by approved inspection experts carried out, or not carrying it out on time | § 9 No. 1 PrüfVO NRW in conjunction with § 86 (1) No. 20, 21 BauO NRW 2018 | Fine of up to €500,000 (§ 86 (3) BauO NRW) |
| Failing to keep inspection reports or to present them to the building control authority | § 9 No. 2 PrüfVO NRW | Fine of up to €500,000 |
| System no longer complies with the building permit (e.g. overdue detectors, defects not remedied) | § 58 BauO NRW 2018 (building control measures) | Order to remedy defects, coercive fine, prohibition of use |
| Supervisory duties within the company breached (maintenance not organised/monitored) | § 130 OWiG, where applicable § 30 OWiG | Fine against management of up to €1 million, corporate fine against the company |
| Fire with injured persons because the system did not raise the alarm in time | § 229 StGB (negligent bodily injury) | Imprisonment of up to 3 years or a fine |
| Fire resulting in death because the system did not raise the alarm in time | § 222 StGB (negligent homicide) | Imprisonment of up to 5 years or a fine |
| Damage to third parties due to breach of the duty of care | §§ 823, 831 BGB | Damages and compensation for pain and suffering; personal liability possible |
The criminal provisions require that the breach of duty caused the damage and that those responsible are at fault. Those responsible may include owners, operators, management and appointed personnel.
Typical omissions
- Detectors operated beyond the replacement interval (5 or 8 years under DIN 14675)
- Recurring inspection by approved inspection experts (every 3 years under PrüfVO NRW) missed
- Inspection (quarterly) and servicing (annually) under DIN VDE 0833-1 not carried out, or not carried out by a specialist company certified to DIN 14675
- Logbook missing or incomplete – replacements, faults and disablements cannot be proven
- Faults and disablements not rectified promptly or not reported to the insurer
- Defects from the inspection report not remedied on time and not reported to the approved inspection expert
- Significant modification (e.g. change of detector series or bases) without a new expert inspection – see expert inspection
- Having detectors replaced by the caretaker, or having the system repaired by a company without DIN 14675 certification for maintenance – see specialist company
- Change of use or conversion without adapting the fire alarm system
Legal bases and sources
- Insurance Contract Act (VVG): §§ 23 ff. (increase in risk), § 28 (breach of obligation), § 81 (causing the insured event)
- Administrative Offences Act (OWiG): § 30 (fine against companies), § 130 (breach of supervisory duty)
- Criminal Code (StGB): § 222 (negligent homicide), § 229 (negligent bodily injury)
- Civil Code (BGB): § 823 (liability for damages), § 831 (liability for vicarious agents)
- State Building Code NRW (BauO NRW 2018, valid from 01.09.2026): § 58 (duties of the building control authorities), § 86 (administrative offences) – recht.nrw.de · PDF
- Inspection Ordinance NRW (PrüfVO NRW, valid from 26.11.2024): § 2 (inspection obligation), § 9 (administrative offences) – recht.nrw.de · PDF
- Standards: DIN 14675 (fire alarm systems – design and operation; certification of specialist companies to DIN 14675-2) and DIN VDE 0833-1/-2 (alarm systems for fire, intrusion and hold-up) – available for a fee from DIN Media or VDE VERLAG
Federal laws as published at gesetze-im-internet.de (Federal Ministry of Justice), state law as published at recht.nrw.de, in each case in the current version, last checked: 19.10.2026. Standards are protected by copyright; we only reproduce their content in substance.
Note: This information provides a general overview and does not replace legal advice. The requirements of your building permit and your fire protection concept are decisive.
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