Fire doors as a legal requirement —
when are they mandatory?

Fire doors are mandatory by law where they form part of a fire-protection-mandated closure — in fire walls, in required corridors and stairwells, between technical and boiler rooms, and at the boundary between separate units of use.

The concrete requirements come from the state building code (in NRW: BauO NRW) and depend on building type and building class. Special-purpose buildings have additional ordinances with stricter requirements.

In multi-family houses from building class 3 upwards, a number of fire doors are required — apartment entrance doors are a common example, as are doors into the stairwell and to basement and technical rooms. The exact requirements vary with building class, number of storeys and special situations.

• Apartment entrance doors — depending on building class, usually from BC 3 upwards
• Doors to the required stairwell
• Basement access and separation of basement from stairwell
• Technical and boiler room
• Service-connection room
• Storage rooms with elevated fire load

In office, production and logistics buildings there are further mandatory areas — primarily the separation of fire compartments and units of use, technical rooms and server rooms. Assembly venues and other special-purpose buildings are governed separately.

• Fire walls and their passages — almost always T90
• Required corridors and stairwells
• Technical rooms, server rooms, archives
• Separation of units of use (e.g. office / warehouse)
• Assembly venues — additional requirements per the venue ordinance

Hospitals, schools, industrial buildings, retail premises and hotels each have their own ordinances — often with significantly stricter requirements than the general BauO NRW. Anyone building or operating here cannot avoid the special rules.

• Hospitals — KhBauVO with numerous requirements
• Schools — school construction ordinance
• Industrial buildings — industrial-building directive
• Retail — VkVO (from 2,000 m²)
• Hotels — accommodation-venue ordinance

Which class — T30, T60 or T90 — is required depends on the location and the fire load. A summary of the most common cases:

For North Rhine-Westphalia, the state building code NRW applies. It defines five building classes (BC 1 to BC 5) distinguished by height, storey count and units of use — the fire-protection requirements hang on these. Required corridors, required stairwells and special-purpose buildings are independent terms with their own rules.

When in doubt, consult the building's fire-protection concept and talk to the building authority — particularly recommended for changes in stock and use.

Violating fire-protection requirements can become unpleasant — usually not immediately, but at the latest at the next fire-safety audit, a tenant change or a claim event. Plain talk: consequences range from fines to loss of insurance to criminal relevance.

• Use prohibition by the building authority
• Fines (state building codes set the framework)
• Loss of insurance cover in case of a claim
• Personal liability of owner / operator / management
• Difficulties letting (tenancy law)
• On personal injury: criminal relevance

Grandfathering generally applies to approved buildings in unchanged state. It expires, however, on change of use, on substantial refurbishment, on concrete danger to life and health, and on subsequent official order.

In practice: anyone converting an office building into a kindergarten, rebuilding a stairwell or receiving an order from the fire-safety audit cannot rely on grandfathering. When in doubt, get it checked rather than hoping.

Four questions we hear repeatedly during condition surveys — with the honest answer rather than the desired one.

• "Does my apartment door need to be a fire door?" — depends on building class and location. In multi-family from BC 3, very often yes.
• "We have an old timber door in the stairwell, do we have to replace it?" — usually yes, at the latest on re-letting or refurbishment.
• "The door is locked — is that enough?" — no, fire protection concerns material properties, not the lock.
• "We have a wedge under the door — is that enough?" — no, fire doors must be self-closing. Wedges immediately render the door ineffective.

A genuine fire door can be recognised by several markers — none alone suffices, but together they form a clear picture.

• Approval label — usually on the side of the leaf, above the hardware or on the frame
• CE mark per the Construction Products Regulation
• Manufacturer marking (Hörmann, Novoferm, Teckentrup, Schüco, etc.)
• Self-closing function via a tested door closer
• Intumescent fire seals and smoke seals

Step by step rather than panic-replacing everything at once. A systematic condition survey first clarifies the scope; then priorities can be set and remediation spread across several months.

• Survey the existing stock (best done by a specialist firm)
• Create a defect list with priority A / B / C
• Plan timeline and budget
• Commission retrofit by a specialist firm — no compromise on installation
• Secure documentation for authority and insurance