8 key differences between active and passive fire protection
By
Marketing Team
@Onetrace
Active and passive fire protection are the two pillars of fire safety in modern buildings, helping limit the impact of fire on people, property, and business operations.
Their importance is reflected in the continued growth of the UK fire protection market.
According to Barbour ABI, the UK passive fire protection market was worth £947 million in 2024 and is forecast to exceed £1.18 billion by 2029. As for its active counterpart, it reached £743 million in 2025, with further steady growth expected through 2029.
However, market size isn’t the only aspect that sets these two strategies apart.
This guide breaks down eight key differences between active and passive fire protection to help you work out what your building needs.
Key takeaways
Active and passive fire protection work together
Active systems detect and respond to fires, while passive systems slow the spread of fire and smoke.They protect buildings in different ways
Active fire protection uses alarms, sprinklers, and other systems that activate during a fire. Passive fire protection is built into the structure through fire doors, compartment walls, and fire stopping.Regular inspections are just as important as installation
Active systems need routine testing, while passive systems require inspections to identify hidden defects that can reduce their effectiveness.Compliance depends on proper maintenance
UK fire safety laws require both active and passive fire protection to remain effective throughout a building’s lifetime.Digital tools make fire protection easier to manage
Onetrace helps passive fire contractors digitise inspections, capture compliance evidence, and keep complete project records from survey to handover.
What is active fire protection?
Active fire protection (AFP) is a group of fire safety systems that detect a fire and respond to it through manual or automatic action.
The response itself depends on the type of system.
Fire alarm and detection systems, which recognise the early signs of a fire and alert building occupants, make up the largest share of the UK’s active fire protection market, accounting for 64% of the sector.
Automatic sprinkler systems, which activate when they reach a set temperature to release water over the affected area, are another widely used measure. Research from the National Fire Chiefs Council (NFCC) and the National Fire Sprinkler Network (NFSN) shows they operate in 94% of fires where they’re installed.
Other common active fire protection systems include:
System | How it works | Where it’s commonly used |
Portable fire extinguishers | Discharging water, foam, carbon dioxide, powder, or wet chemicals to tackle small fires manually | Offices, schools, retail premises |
Emergency escape lighting | Illuminating escape routes automatically if the main power supply fails | Offices, schools, healthcare facilities |
Fire blankets | Smothering small fires by cutting off the oxygen supply | Commercial kitchens, laboratories |
Fire hydrants and hose reels | Providing a reliable water supply for firefighters or trained personnel | Commercial buildings, industrial sites |
Automatic opening vents (AOVs) | Releasing smoke and heat through roof or wall vents when activated | Blocks of flats, stairwells, atriums |
Smoke control systems | Extracting smoke through automatic vents or mechanical fans to improve visibility and air quality | High-rise buildings, shopping centres |
Emergency voice communication systems (EVCS) | Enabling two-way communication between occupants and emergency responders during an incident | High-rise buildings, hospitals, public buildings |
Dry and wet risers | Supplying water to upper floors through fixed pipework for firefighting operations | Multi-storey buildings |
Water mist systems | Discharging fine water droplets to cool the fire and reduce heat | Data centres, museums, heritage buildings |
Gas suppression systems | Releasing inert or chemical gases to suppress fires without damaging sensitive equipment | Server rooms, electrical plant rooms, data centres |
What is passive fire protection?
Passive fire protection (PFP) is a group of fire-resistant elements built into the fabric of a building.
Common examples of passive fire protection include:
System | What it is | What it does |
Fire-rated walls, floors, and ceilings | Fire-tested structural elements made from fire-resistant materials | Create fire-resistant compartments within a building |
Fire doors | Self-closing, fire-rated doors fitted with intumescent strips and smoke seals | Slow the spread of fire and smoke between compartments |
Fire stopping | Intumescent seals, collars, wraps, pillows and batts used to seal service penetrations | Seal gaps around pipes, cables, and ducts to maintain fire resistance |
Fire-resistant glazing | Fire-resisting glass and glazed screens used in doors, windows and partitions | Resist the passage of fire and smoke while maintaining visibility |
Fire and smoke dampers | Fire-rated dampers fitted within ventilation ductwork | Close when triggered to restrict the spread of fire and smoke through ducts |
Cavity barriers | Concealed cavities within walls, roofs, floors and external cladding | Restrict fire spread through hidden voids |
Intumescent coatings | Heat-reactive coatings applied to structural steel | Expand when exposed to high temperatures to insulate steel and delay structural failure |
Fire curtains | Automatically deployed fire-resistant fabric barriers | Separate open spaces to help contain fire and smoke |
8 core differences between active and passive fire protection
These eight differences between active and passive fire protection show how the two approaches differ in their design, operation, and role within a building.
1. What they’re designed to do
Active fire protection aims to detect, alert, and suppress a fire once it starts, while passive fire protection focuses on containing it within a specific area of the building and limiting how far fire and smoke can spread.
So, rather than tackling the fire directly, passive fire protection prevents it from affecting other parts of the building.
2. How they work
The operating principle behind active and passive fire protection is fundamentally different.
Active fire protection relies on interconnected mechanical, electrical, or electronic systems to detect and respond to a fire. A sprinkler system, for example, activates when heat reaches a sprinkler head, while a smoke detector triggers an alarm after sensing smoke.
Passive fire protection, by contrast, relies on fire-resistant materials and building components integrated into the structure itself. An FD60 fire door, for instance, provides up to 60 minutes of fire resistance through its fire-rated core and intumescent seals rather than through a powered or mechanical system.
3. When they respond
Active fire protection only responds after a fire or its warning signs, such as heat, smoke, or flames, trigger a manual or automatic action.
Passive fire protection, however, is already in place before a fire starts, providing continuous protection throughout the incident.
This means active systems react to changing conditions, while passive systems remain ready at all times.
4. Where they’re used
Active fire protection is typically installed where early fire detection, suppression, or emergency response is required, such as:
Occupied spaces, including offices, schools, hospitals, and residential buildings
Escape routes, such as corridors, stairwells, and exits
High-risk areas, including commercial kitchens, server rooms, plant rooms, and chemical storage areas
Large open spaces, such as warehouses, shopping centres, and industrial facilities
Passive fire protection is also present in these buildings, but it’s integrated throughout the structure itself. It’s commonly found in walls, floors, ceilings, service penetrations, structural steel, and ventilation systems, helping protect the building from within.
5. How they’re installed
Active and passive fire protection are typically installed by different specialist contractors.
The former is commonly installed by fire alarm engineers, sprinkler installers, suppression specialists, and electrical contractors.
Once installed, they must be commissioned and tested before they become operational.
As for the latter, it’s usually installed during construction or refurbishment by:
Builders
Drywall contractors
Fire stopping specialists
Structural steel contractors
6. How they can fail
Active fire protection is most likely to fail when a system doesn’t operate as intended. Common causes include:
Poor maintenance
Power outages
Faulty electronics
Blocked sprinkler heads
Closed isolation valves
Human error
However, when properly maintained, active systems are highly reliable.
According to the NFCC and NFSN analysis titled Efficiency and Effectiveness of Sprinkler Systems in the United Kingdom, sprinkler systems successfully extinguish or contain a fire 99% of the time.
Passive fire protection, in contrast, is more likely to fail when fire-resistant building elements are damaged, incorrectly installed, or compromised during refurbishment.
Fire Door Inspection Scheme (FDIS) data from more than 100,000 inspections found that 75% of fire doors failed to meet the required standard in 2021, with excessive gaps, poor maintenance, and damaged smoke seals among the most common issues.
These findings indicate that passive fire protection is particularly susceptible to defects that can go unnoticed until they’re identified during an inspection or exposed by a fire.
7. How they’re maintained
Active fire protection maintenance focuses on ensuring systems continue to operate as intended through regular testing, servicing, and component checks. These may include:
Alarm testing
Sprinkler inspections
Emergency lighting tests
Detector cleaning
Battery replacement
Passive fire protection maintenance aims to identify and repair defects that could reduce the performance of fire-resistant building elements over time.
Unlike active systems, these elements can be compromised by everyday wear, refurbishment work, or new service installations without the damage being immediately obvious.
That’s why regular inspections like fire door surveys are used to check that fire doors still close properly, their intumescent strips and smoke seals remain intact, and they haven’t been altered in ways that reduce their fire performance.
Fire risk assessments also play an important role by identifying wider issues, such as damaged compartment walls, unsealed service penetrations, or missing fire stopping that could allow fire and smoke to spread beyond their point of origin.
8. Which regulations apply
Both active and passive fire protection form part of a building’s overall fire safety strategy and are covered by legislation like:
Together, these place a legal duty on building owners and responsible persons to ensure fire protection measures remain effective throughout a building’s life.
The technical requirements, however, differ depending on the type of protection.
Active fire protection typically follows standards covering system design, installation, testing, and maintenance, such as:
BS 5839 for fire detection and alarm systems
BS EN 12845 for sprinkler systems
BS 5306 for portable fire extinguishers
Passive fire protection follows standards focused on fire-resistant construction and compartmentation, including BS 9999 for fire safety in building design and the BS EN 1366 series for fire resistance testing.
Active vs passive fire protection: Which do you need?
Effective fire safety depends on both active and passive fire protection working together.
Each addresses a different aspect of a fire, creating multiple layers of protection that help detect, control, and contain an incident while giving occupants more time to evacuate and firefighters a safer environment to work in.
Major fire investigations demonstrate why relying on only one approach isn’t enough.
The 1992 Allied Colloids warehouse fire highlighted the consequences of inadequate smoke detection and fire-fighting systems, while the 1995 BASF warehouse fire showed that even buildings with multiple fire safety features can remain vulnerable when fire doors fail to perform as intended. In both cases, shortcomings in different parts of the fire protection strategy allowed the incidents to escalate.
Whether you’re constructing a new building or managing an existing one, active and passive fire protection should be designed, installed, inspected, and maintained as complementary parts of the same fire safety strategy.
The future of active and passive fire protection is digital
As buildings become more complex and fire safety requirements continue to evolve, digital tools are becoming essential for managing both active and passive fire protection.
Instead of relying on paper records, manual inspections, and disconnected systems, building owners and contractors can monitor assets, schedule maintenance, and maintain compliance from a single digital platform.
For active fire protection, digitalisation is driving smarter fire safety systems.
Modern alarms, detectors, and sprinklers can integrate with building management systems, while remote monitoring, automated testing, and predictive maintenance help identify faults before they become safety risks.
For passive fire protection, the focus is on traceability.
Passive fire protection software allows contractors to create a complete digital record of every installation, inspection, and remedial repair throughout a building’s lifecycle. This provides clear evidence of where fire doors, fire stopping systems, cavity barriers, and fire dampers are installed, what materials were used, when inspections took place, and how any defects were resolved.
Onetrace is a great example of a system designed specifically for passive fire contractors and specialist subcontractors.
It allows teams to:
Capture photographic evidence on site
Pin passive fire assets to digital drawings
Track materials
Standardise inspections through digital forms
Generate audit-ready reports
Centralise all essential fire protection documentation
These capabilities reduce administrative work and make it easier to demonstrate compliance, maintain the building’s golden thread of information, and provide clients with a comprehensive record of completed work.
If you’re ready to replace paper-based processes with a fully digital passive fire protection workflow, book a personalised Onetrace demo to see how the platform can help your team improve traceability, simplify safety compliance, and manage every project from survey to handover.
FAQ
What are the two types of fire protection?
The two types of fire protection are active and passive. Active fire protection detects and responds to fires, while passive fire protection helps contain fire and smoke through the building’s construction.
What is an example of passive fire protection?
A fire door is one of the most common examples of passive fire protection. Other examples include fire-rated walls and floors, fire stopping around service penetrations, cavity barriers, and fire-resistant structural coatings.
What is an example of an active fire protection system?
A fire sprinkler system is a common example of an active fire protection system. Other examples include smoke detectors, fire alarms, fire extinguishers, smoke ventilation systems, and hose reels.
What is the difference between active and passive protection systems?
Active fire protection requires a manual or automatic response to detect, alert, or suppress a fire, while passive fire protection is built into the building’s structure to slow the spread of fire and smoke without requiring activation.
Marketing Team
@Onetrace
The Onetrace marketing team is passionate about sharing insights, ideas, and innovations that help construction businesses stay connected, compliant, and efficient. Combining industry expertise with a love for clear communication, we aim to deliver content that empowers professionals to work smarter and safer.