When people think about fire safety, they picture alarms, extinguishers and evacuation drills. What often gets overlooked is the quiet system working in the background: fire compartmentation.
Fire compartmentation is how a building is divided into fire resisting sections using walls, floors, ceilings and fire doors. Its purpose is simple but critical. It slows the spread of fire and smoke, protects escape routes and buys people time.
For non-technical staff such as receptionists, cleaners, security teams, porters and admin teams, this matters more than many realise. Everyday actions can protect compartmentation or unintentionally compromise it.
The Legal Position in the UK
Under the Regulatory Reform (Fire Safety) Order 2005, the Responsible Person must ensure fire safety measures are maintained. That includes fire doors, fire resisting walls and floors, and the integrity of compartmentation.
Technical standards sit within Building Regulations 2010, particularly Approved Document B, which sets out requirements for fire resistance, fire stopping and structural protection.
More recently, the Building Safety Act 2022 and Fire Safety (England) Regulations 2022 introduced additional duties, including regular fire door checks in certain residential buildings.
Here’s what that really means. Compartmentation is not optional. It is a legal requirement, and it must be maintained.
Why Compartmentation Fails in Real Buildings
In theory, compartmentation is designed into the building. In reality, it can be damaged over time.
Common issues include:
Fire doors wedged open for convenience
Damaged door frames or missing smoke seals
Broken self closers
Holes around pipes or cables left unsealed
Alterations where walls are cut through and not properly reinstated
Ceiling voids where fire walls do not extend fully
These are not dramatic acts of negligence. They are often small, everyday oversights. But small breaches allow smoke and heat to travel quickly, especially through hidden voids and service risers.
Why Non Technical Staff Play a Key Role
Most breaches are first noticed by people who work in the building every day.
A cleaner might see a door that never fully closes.
A receptionist might notice contractors drilling through a wall.
Security staff might see a corridor door wedged open overnight.
If those issues are ignored, escape routes can fill with smoke faster, evacuation time reduces and legal exposure increases.
Under fire safety law, failure to maintain passive fire protection can lead to enforcement notices, fines or even prosecution. Insurance claims can also be challenged if compartmentation is found to be defective.
Clear, Practical Messages for Staff
When we train teams, we keep it simple:
A closed fire door protects you. Never wedge it open.
If a door does not shut fully, report it.
Small holes in walls or ceilings matter.
If contractors drill or cut through walls, check that it is sealed properly afterwards.
If in doubt, raise it.
Compartmentation is not just a building design feature. It is a living safety system that depends on awareness.
How Organisations Can Improve Awareness
At Legionella and Fire Safe Services, we encourage clients to:
Include compartmentation in induction training
Provide visual guidance on fire doors and escape routes
Make reporting simple and quick
Carry out post works inspections after any building alterations
Conduct regular fire door checks and passive fire audits
Creating a culture where people feel confident raising concerns makes a measurable difference.
A Real World Perspective
We regularly see buildings where service cables have been run through fire rated walls and left unsealed. In some cases, smoke has travelled through those gaps during small incidents, reaching protected corridors far quicker than expected.
We have also inspected properties where fire door closers were broken for months. Staff assumed someone else would deal with it. During a minor fire event, the door failed to contain smoke effectively.
These are preventable risks.
Fire Compartmentation Is Invisible Until It Is Not
Compartmentation does not make noise. It does not flash. It does not send alerts. But it is one of the most important layers of protection in any building.
Raising awareness among non technical staff is not about turning them into fire engineers. It is about helping them understand what to look for and giving them the confidence to act.
If you are unsure whether your building’s compartmentation is compliant, or you would like structured awareness training for your team, speak to Legionella and Fire Safe Services.
We carry out compartmentation surveys, fire door inspections and passive fire audits across the UK.
Let’s make sure your building is genuinely safe, not just compliant on paper.
