What a Competent Fire Door Inspector Actually Checks
By Sebastian Grabowski, DC Fire & Security — installing and maintaining fire and security systems since 2010. Updated August 2026.
What do fire door inspectors actually check?
A competent fire door inspection works through 8 component groups on every single door — gaps, seals, hinges, closer, glazing, certification labels, threshold and signage — recorded door by door with photographs. The checklist below is the one DC Fire & Security inspectors work through, aligned to BS 8214:2026. Fire door inspections from £25 per door — typically £25–£30 depending on access and reporting; volume discounts on larger programmes; minimum visit fee applies.
What does a fire door inspection checklist cover?
A proper fire door inspection checklist covers 8 things: perimeter gaps, intumescent and smoke seals, hinges, the closer, glazing, certification labels or plugs, the threshold and signage. DC Fire & Security checks all 8 on every door and photographs what it finds, because a defect on any one of them can stop a 30-minute door doing its 30 minutes.
| Component | What the inspector checks | What failure looks like |
|---|---|---|
| Gaps — head and stiles | 2–4 mm along the top and sides, consistent over the full length. A £1 coin is about 3 mm and makes a workable gauge | Gaps past 4 mm after years of wear, planing or repainting; daylight at a corner |
| Intumescent & smoke seals | Continuous, the right type for the door, seated in the groove — not painted over, snapped or missing in sections | Painted-in seals; lengths torn out by trolleys; smoke brushes flattened or gone |
| Hinges | Three hinges on most doors, fire-rated and marked, every screw present and tight, no wear debris at the knuckles | Missing or mismatched screws, two-hinge doors, worn hinges leaking metal dust |
| Closer | Closes and latches the door from any angle — including from about 75 mm ajar — under control, without slamming | Doors that stall on the latch, disconnected closers, doors wedged open |
| Glazing | Fire-rated glass with intact beading and glazing seals matching the door's rating | Cracked panes, loose beading, ordinary float glass swapped in after a breakage |
| Labels & plugs | Certification label or colour-coded plug, usually on the top edge or hinge stile — the door's identity | Labels painted over or missing, leaving a door with no test evidence |
| Threshold | Gap under the leaf up to 8 mm — around 3 mm where smoke control matters, unless a drop seal is fitted | New flooring closing the gap to nothing, or opening it well past 8 mm |
| Signage | “Fire door — keep shut” (or “keep locked”) on the right doors, at the right height, both sides where needed | No signage at all — or signage on a door propped open with an extinguisher |
How should fire door gaps be checked?
Gaps are where most fire doors fail first. The working band at the head and stiles is 2–4 mm, aiming for 3 mm, and the number matters because intumescent seals can only bridge so much: at 3 mm they close the gap early in a fire, at 6 or 7 mm they may never seal it. An inspector measures along the full edge, not at one convenient spot — doors drop, frames move, and a door can be right at the top and wrong at the latch. There's a fuller breakdown in our fire door gap tolerances guide.
Why do certification labels and plugs matter so much?
The label or plug is the door's test evidence — proof of what it is and what it was tested to do. Without it a door becomes “notional”: it might be a fire door, and no one can demonstrate it. Inspectors check the top edge and hinge stile, and note where decorators have painted the evidence out of existence. A notional door isn't automatically scrap, but it can't simply be signed off either — it needs assessing on construction, and sometimes upgrading, before anyone certifies it.
What should the inspection report record?
Door by door: location, what was checked, what failed, a photograph of each defect and a remedial recommendation with a price against it. DC Fire & Security prices defects individually in every report, and the test of a good report is blunt: another contractor should be able to price the remedial works from it without a site visit. A tick-box sheet with no photographs and no per-defect detail tells you a door was walked past, not inspected.
Can you use this checklist yourself?
Yes — and for the quarterly in-house checks required in residential buildings over 11 metres, you should. Those routine checks need a trained eye and a record, not a certificated inspector; the 8 rows above are exactly what to look at, and how often fire doors need inspecting covers the legal frequencies. What in-house checks don't replace is periodic inspection by a competent person against BS 8214:2026 — the current fire door installation standard, tracked in our Standards Watch series — which is where defects get formally identified, evidenced and priced.
What happens when a door fails?
Most failures are component fixes, not replacements. Seals get replaced, closers swapped or adjusted, doors eased, hardware made good — as a guide from our own rate card, a single-door remedial visit with re-check and certificate runs about £350 + VAT, and a full single-door refurbishment about £950 + VAT. The point of a priced, per-defect report is that you can fix the worst doors first instead of being quoted one frightening number for the lot. When you're ready for that stage, fire door remedial works is where we pick the schedule up.
Frequently Asked Questions
How long does a fire door inspection take?
How much does a fire door inspection cost?
How often should fire doors be inspected?
Who can inspect fire doors?
What is a notional fire door?
Want the checklist run properly?
We inspect fire doors across Bedfordshire, Hertfordshire and London — every door photographed, every defect priced, and a report you can hand straight to your fire risk assessor, freeholder or insurer. Book a fire door inspection or call with your door count and we’ll price the visit.
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