Fire doors are one of the most important passive fire protection measures in any building. When they’re specified correctly, installed properly and maintained over time, they help compartmentalise fire and smoke, protect escape routes, and buy crucial time for evacuation and emergency response.

The problem is that fire door compliance failures are still incredibly common across UK buildings. In our experience, many issues are not the result of one dramatic failure, but of smaller oversights that build up over time: poor maintenance, uncertified alterations, missing components, or a lack of regular checks.

For landlords, facilities managers, contractors, housing providers and Responsible Persons, those mistakes can create serious safety risks as well as compliance issues.

In this guide, we break down 7 of the most common fire door compliance mistakes we see in UK buildings, why they matter, and what to do instead.

Why fire door compliance matters

A fire door is only effective if it performs as a complete fire-resisting doorset or door assembly. That means the door leaf, frame, seals, glazing, hinges, ironmongery, closer and installation details all need to work together as intended.

If even one part is compromised, the fire door may no longer do its job.

This matters not just from a safety perspective, but from a legal and operational one too. Under UK fire safety legislation, Responsible Persons must ensure that fire safety measures are maintained in an efficient state and that fire doors remain fit for purpose. In England, the Fire Safety (England) Regulations 2022 also introduced additional duties for certain multi-occupied residential buildings, including quarterly checks of communal fire doors and annual checks of flat entrance doors in buildings over 11 metres.

With that in mind, here are the mistakes we see most often.

1) Treating a fire door like a normal door

One of the biggest mistakes is assuming a fire door is simply a heavier version of a standard internal door. It isn’t.

A compliant fire door is part of a tested and certified fire protection system. It is designed to resist fire and smoke for a specified period — commonly FD30 or FD60 — and that performance depends on the whole doorset being correct, not just the door leaf itself.

When fire doors are treated like ordinary joinery items, it often leads to problems such as:

• replacing components with non-compatible hardware

• trimming or altering the door without checking certification limits

• fitting decorative items, signage or security products incorrectly

• using the wrong frame, glazing system or seals

• carrying out repairs without understanding the fire door’s tested specification

Why it’s a compliance problem

A fire door’s performance is based on test evidence, third-party certification, correct specification and proper installation. Once it is altered carelessly, there is a real risk that it will not perform as intended in a fire.

Best practice

Always treat a fire door as a specialist fire safety product, not a general building component. Before making changes, confirm:

• the fire rating of the door

• whether it is a certified door or doorset

• what hardware, glazing and seals are compatible

• whether the proposed change falls within the manufacturer’s or certification body’s guidance

2) Missing, damaged or painted-over intumescent and smoke seals

Seals are one of the most commonly overlooked parts of a fire door, yet they are critical to performance.

Intumescent seals are designed to expand when exposed to heat, helping to close the gap between the door leaf and frame in a fire. Smoke seals help restrict the spread of cold smoke, which is often one of the biggest threats to life in the early stages of a fire.

Common issues we see include:

• seals missing altogether

• seals damaged, loose, split or partially detached

• seals painted over

• seals fitted inconsistently or with gaps

• the wrong type of seal fitted for the door specification

• replacement seals installed without checking compatibility with the original fire test evidence

Why it’s a compliance problem

If seals are missing or compromised, the door may not effectively resist fire or smoke spread. GOV.UK fire door guidance specifically highlights strips and seals as one of the key elements that should be checked as part of a simple fire door inspection regime.

Best practice

Check that seals are:

• present and continuous where required

• firmly fixed and undamaged

• free from paint build-up or contamination

• appropriate for the door’s rating and application

If there’s any doubt, have the door assessed by a competent fire door professional before replacing components.

3) Excessive gaps around the door leaf

Gap sizes matter more than many people realise.

A fire door needs enough clearance to open and close properly, but not so much that smoke and fire can pass through too easily. Oversized perimeter gaps and threshold gaps are one of the most frequent fire door faults identified during inspections.

Typical causes include:

• poor original installation

• building movement or frame distortion

• wear over time

• doors being removed and rehung incorrectly

• undercutting or trimming without checking permitted tolerances

Why it’s a compliance problem

Even if the door leaf itself is fire rated, excessive gaps can seriously reduce performance. A fire door that does not close tightly within the expected tolerances may fail to contain smoke and fire effectively.

Best practice

As part of routine inspections, check that:

• the door closes properly into the frame

• the perimeter gaps appear consistent

• there are no obvious excessive gaps at the head, jambs or threshold

• the door isn’t binding, dropping or pulling away from the frame

Where gaps look questionable, don’t guess. Have them measured and assessed by a competent person, especially in higher-risk or regulated buildings.

4) Fire doors that don’t fully self-close

A fire door that has been propped open or one that fails to self-close properly is one of the clearest examples of a fire door that cannot do its job.

We regularly see doors that:

• have closers disconnected or poorly adjusted

• stick on the floor or frame and fail to latch

• are held open with wedges, bins, extinguishers or other objects

• have damaged or leaking closers

• have been altered after installation, affecting closing performance

Why it’s a compliance problem

A fire door is intended to be a protective barrier when closed. If it doesn’t close properly from any open position, the compartmentation strategy of the building can be undermined.

Government fire door guidance for Responsible Persons specifically points to checking that the door closes properly and that self-closing devices are functioning correctly where fitted.

Best practice

Make sure fire doors:

• are never wedged open unless a compliant, suitable hold-open solution is in place

• close fully into the frame

• latch properly where required

• have closers that are functioning as intended

• are inspected promptly if occupants report sticking, slamming or failure to close

5) Unauthorised alterations to glazing, hardware or the door leaf

Another common compliance issue is the well-intentioned but unauthorised alteration.

Examples include:

• cutting in vision panels after installation without approved fire-rated glazing systems

• replacing hinges, locks, handles or closers with products that have not been checked for suitability

• adding letter plates, grilles, access control hardware or security viewers without understanding the impact on certification

• trimming the door beyond allowable limits

• drilling the leaf for signage, kick plates or cable routes without proper assessment

Why it’s a compliance problem

Fire doors are tested as systems. Once the specification changes, you may be outside the scope of the original test evidence or third-party certification.

That doesn’t automatically mean every alteration is unacceptable, but it does mean it must be assessed properly. Random substitutions and on-site modifications are one of the fastest ways to turn a compliant fire door into a questionable one.

Best practice

Before altering a fire door:

• identify the door manufacturer or certification where possible

• review the door’s data, label or plug

• check whether the proposed ironmongery or glazing system is approved for use

• use competent fire door installers or inspectors for any modification work

6) Poor record-keeping and inconsistent inspection routines

A surprising number of buildings do not have a clear fire door inspection and maintenance trail. Doors are checked informally, issues are spotted but not recorded, or remedial works are carried out with no audit trail.

That creates two problems:

1. faults can be missed, repeated or left unresolved

2. the building owner or Responsible Person has little evidence of due diligence

This is particularly important in residential buildings in scope of the Fire Safety (England) Regulations 2022, where Responsible Persons in buildings over 11 metres must undertake quarterly checks of communal fire doors and use best endeavours to undertake annual checks of flat entrance doors, keeping records of the steps taken.

Why it’s a compliance problem

If you don’t have a reliable system for inspection, defect logging and remedial follow-up, fire door issues can remain live for months. In an audit, FRA review, resident complaint or post-incident investigation, poor documentation can become a major weakness.

Best practice

Put in place a simple but robust system that includes:

• an asset register of fire doors

• scheduled inspection dates

• defect categories and priorities

• records of access attempts where required

• evidence of completed remedial works

• reinspection where necessary after repairs

For many organisations, this is where fire door compliance starts becoming manageable rather than reactive.

7) Assuming installation alone equals long-term compliance

A newly installed fire door is not automatically “sorted” forever.

Fire doors are high-use items. In schools, apartment blocks, offices, healthcare settings, hotels and public buildings, they are opened and closed constantly. Over time, normal wear and tear can affect alignment, hinges, closers, latches, seals and frames.

We often see buildings where the original installation may have been broadly acceptable, but years later the doors are no longer performing as intended because no one has checked them properly since.

Why it’s a compliance problem

Fire door compliance is not a one-off purchasing decision. It is an ongoing maintenance and management responsibility.

The Regulatory Reform (Fire Safety) Order 2005 requires fire precautions to be maintained in an efficient state, in efficient working order and in good repair. Fire risk assessments must also be reviewed and acted upon where fire safety measures deteriorate or become invalid.

Best practice

Think in terms of a fire door lifecycle, not a single installation event:

• specify correctly

• install correctly

• inspect routinely

• record defects

• repair with compatible components

• review after changes in use, occupancy or building works

That approach is far more effective than waiting until an FRA, enforcement action, resident complaint or project handover exposes the problem.

A simple fire door compliance checklist

If you are responsible for fire doors in a building, these are some of the first things worth checking:

• Does the door appear to be a fire door suitable for its location?

• Is the door leaf in good condition, without unauthorised damage or excessive alteration?

• Does the door close fully and latch properly where required?

• Are the frame, hinges, closer and hardware secure and in working order?

• Are intumescent and smoke seals present, intact and not painted over?

• Are the gaps around the door leaf consistent and within expected tolerances?

• Is any glazing intact and fitted using an appropriate fire-rated system?

• Have previous inspection defects actually been resolved?

• Do you have a record of checks, repairs and follow-up actions?

If the answer to any of those is “no”, “not sure” or “we haven’t checked”, it’s worth taking action sooner rather than later.

Final thoughts

Most fire door compliance failures do not happen because somebody deliberately ignores safety. More often, they happen because the door is treated like a standard joinery item, inspection routines are inconsistent, or small defects are allowed to become normal.

That’s exactly why regular fire door checks, competent installation and clear maintenance processes matter.

At Premier Fire Doors, we work with contractors, housing providers, facilities teams, developers and property professionals who need fire doors that are specified correctly, supplied clearly and supported with practical compliance-focused guidance. If you need help with FD30 and FD60 fire doors, glazed fire doors, doorsets, specification support or understanding what may be required for your project, we’re here to help.

Need help with compliant fire door supply?

Premier Fire Doors supplies a wide range of internal and external fire doors, FD30 and FD60 options, glazed fire doors and doorsets for residential, commercial and public sector projects. If you’re reviewing a scheme, replacing non-compliant doors, or building out a more robust fire door strategy, get in touch with our team to discuss your requirements.