Whether you are preparing for a fire door inspection, reviewing a report with defects, or trying to understand recurring issues across a building, it helps to know what inspectors commonly record.
Common fire door defects include excessive gaps, damaged seals, poor closing action, damaged frames, unsuitable hinges or fixings, altered door leaves, missing signage, glazing concerns, and doors being wedged open or obstructed.
This guide explains why defects matter, walks through ten frequent issues, and outlines what property teams may do when findings are recorded. For door-by-door detail, see our fire door inspection defects hub and individual defect guides.
Quick answer: what are the most common fire door defects?
During fire door inspections across London residential, commercial and institutional buildings, inspectors frequently record issues with closing performance, gaps, seals, frames, ironmongery, signage, glazing and operational misuse such as wedging doors open.
Defects are observations of visible condition at the time of inspection. Recording a defect does not automatically mean the whole building is non-compliant, and it is not the same as a simple pass/fail certificate for the premises.
Why fire door defects matter
Fire doors are intended to help restrict fire and smoke spread and protect escape routes. Visible defects may indicate that a door set is not performing as intended at the time of inspection — for example because it cannot close fully, seals are damaged, or the door is routinely held open without an approved device.
Structured defect records can help property teams prioritise remedial works, brief contractors with clear door references, and maintain internal documentation. They may help support compliance management but do not prove statutory compliance on their own.
Defect 1: Door not closing fully
A fire door that does not close fully into the frame or fails to latch is one of the most significant operational defects. Causes may include faulty closers, binding hinges, floor level changes, obstructions, or misalignment.
Inspectors typically check closing action from a suitable open position and note whether the door engages with the latch without being forced. This is reviewed alongside closer condition and hinge security.
Defect 2: Excessive or uneven gaps
Gaps around the head, sides, meeting stiles and threshold may be recorded where clearances appear excessive or uneven. Gap issues are assessed with seals, frame alignment and closing performance — not as isolated measurements.
Uneven gaps may suggest frame movement, worn hinges, poor installation or informal adjustment. See our fire door gap regulations guide for more detail on which edges are commonly checked.
Defect 3: Missing or damaged intumescent and smoke seals
Intumescent and smoke seals should be continuous, correctly fitted and undamaged where visible. Missing sections, brush seals that no longer contact the door, painted-over intumescent strips, or seals cut short at corners are commonly recorded.
Seal condition interacts with gaps and closing performance. Replacing seals with apparently similar products without checking door set compatibility can be a common remedial mistake.
Defect 4: Damaged door leaf
Door leaf damage — including impact marks, delamination, warping, loose panels or unsuitable repairs — may be recorded where observed. Damage can affect how the door sits in the frame and how hardware performs over time.
Unauthorised holes, cut-outs, letterboxes or cat flaps may also be noted as alterations that could affect door performance unless supported by suitable evidence.
Defect 5: Damaged frame or poor fit
Frame damage, cracked architraves, loose fixings or movement in the frame can affect alignment, gaps and latching. Frame condition is reviewed alongside the door leaf and surrounding fire stopping where included in scope.
Repeated contractor damage or building movement may cause recurring frame-related defects across multiple doors in the same block or corridor.
Defect 6: Hinge and fixing issues
Hinges should be secure, correctly specified and free from excessive wear. Missing screws, incorrect fixings, damaged hinge blades or insufficient hinge numbers for door weight may be recorded where visible.
Loose ironmongery can affect closing line, gap appearance and long-term door stability. Hardware changes should be controlled and supported by suitable specification where required.
Defect 7: Latch and lock problems
The latch should engage with the keep and hold the door shut in the frame when closed. Misaligned keeps, damaged latches, or hardware that prevents full closure may be recorded as defects.
Lock changes and access control additions are common in commercial and residential buildings. Unsuitable hardware not compatible with the fire door set may be noted where observed.
Defect 8: Glazing and vision panel concerns
Glazing and vision panels should be appropriate for the fire door assembly where assessed as part of scope. Non-compliant glazing, damaged beads, missing markings or unauthorised panel changes may be recorded.
Signage and glazing issues sometimes appear together on corridor doors where vision panels have been replaced without suitable fire-rated components.
Defect 9: Missing or unsuitable signage
Fire door signage helps occupants understand door purpose and correct operation. Missing, incorrect, damaged or non-standard signage may be recorded where observed.
Signage alone does not confirm that a door is a certified fire door set, but its absence or poor condition may still be noted as a visible defect during inspection.
Defect 10: Doors wedged open or obstructed
Fire doors held open by wedges, hooks, furniture or obstructions without an approved hold-open device are a common operational defect. A door that cannot close when needed may not perform its intended protective function.
Approved hold-open devices linked to the alarm system are distinct from informal wedging. Inspectors usually record unapproved hold-open methods where observed on site.
What happens when defects are recorded
When defects are identified, a structured inspection report may include door references, defect descriptions, priority guidance and photo records where captured. Property teams should review findings, brief contractors with clear locations, and plan remedial action proportionately.
Findings should be considered alongside wider fire safety arrangements and, where needed, competent fire safety advice. An inspection report may help evidence action taken but does not prove compliance.
When remedial works and re-inspection may be needed
Remedial works may be appropriate where defects are recorded — from replacing seals and adjusting closers to frame repairs or controlled hardware changes. Specifications should be confirmed with suitably competent contractors.
Re-inspection after remedial works may be useful to review updated door condition where agreed in scope. This is a follow-up inspection recording observed condition, not a compliance certificate.
Book an inspection or request defect guidance
If you need a structured fire door inspection for a London property or portfolio — or you have existing defects to review — contact us to discuss scope, reporting format and practical next steps.