Definition
Passive fire protection (PFP) comprises the structural and material elements built into a building to contain or slow the spread of fire and smoke without requiring activation — including compartmentation, fire doors, fire stopping, cavity barriers, and structural fire protection. PFP elements must comply with Approved Document B and are assessed as part of a fire risk assessment.
Terms mentioned in this definition
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Find a BFC memberPassive fire protection refers to fire safety measures that are built into the fabric of the building rather than activated in response to a fire. Unlike active systems — such as sprinklers or fire alarms — passive protection works continuously and silently, simply by virtue of how the building is constructed. Its purpose is to limit the spread of fire and toxic smoke, maintaining structural integrity and keeping escape routes safe long enough for occupants to evacuate.
The four principal elements of passive fire protection are: compartmentation (dividing the building into fire-resisting cells), fire doors (sealing openings in compartment lines), fire stopping (sealing penetrations around services), and cavity barriers (blocking concealed voids through which fire can travel unseen).
When a fire starts, occupants need time to evacuate safely and the fire and rescue service needs time to mount an effective response. Passive fire protection is what buys that time. A well-compartmented building can contain a fire to its room of origin for 30, 60, or 90 minutes — the time rating depends on the building's use, height, and occupant profile as specified in Approved Document B and BS 9999.
Failures in passive fire protection — missing fire stopping around a cable penetration, a fire door held open, a damaged intumescent seal — can allow fire and smoke to spread through a building in minutes, turning a survivable incident into a fatal one. This is why the condition of all passive fire protection elements must be assessed as part of every fire risk assessment.
The Regulatory Reform (Fire Safety) Order 2005 requires the responsible person to ensure that fire safety measures — including passive fire protection — are maintained in efficient working order. This obligation is ongoing: it is not enough to install passive fire protection correctly at the time of construction. Any subsequent building works, refurbishment, or change of use may compromise compartmentation or fire stopping, and must be surveyed and remediated.
For new builds and major refurbishments, passive fire protection must be designed and installed to meet Approved Document B requirements. For existing buildings in England and Wales, the fire risk assessment is the mechanism through which the condition of passive fire protection is evaluated and deficiencies are identified.
The British Fire Consortium member directory includes passive fire protection specialists offering fire stopping surveys, compartmentation assessments, fire door inspections, and remediation work. Using a BFC member ensures work is carried out by a vetted, competent professional whose output will satisfy enforcement authorities and insurers.
Passive fire protection (PFP) comprises the structural and material elements built into a building to contain or slow the spread of fire and smoke without requiring activation — including compartmentation, fire doors, fire stopping, cavity barriers, and structural fire protection. PFP elements must comply with Approved Document B and are assessed as part of a fire risk assessment.
Requirements for passive fire protection in the UK depend on the type of premises and applicable legislation, including the Regulatory Reform (Fire Safety) Order 2005 and relevant British Standards. The responsible person for a premises must ensure adequate fire safety provisions are in place. The British Fire Consortium can provide guidance — contact our team or search our member directory to find a qualified specialist.
Passive Fire Protection and Compartmentation are related fire safety concepts but serve different purposes. See our individual glossary entries for detailed definitions. For expert guidance on which applies to your premises, consult a BFC member company.
The British Fire Consortium offers EAL Level 3 accredited training covering fire safety systems including topics related to passive fire protection. Our courses are the only nationally recognised Level 3 qualifications across all fire disciplines. View our training courses or use the member directory to find a qualified trainer near you.
