TL;DR
- In England, buildings with a storey over 11 metres trigger the hardest duties: quarterly checks of every fire door in the common parts, and annual checks of flat entrance doors on a best endeavours basis.
- Below 11 metres the quarterly rule does not apply, but the general duty to keep fire doors working never goes away.
- The gap around a leaf should never be more than 4mm. It is the fastest fail on any checklist, and usually the work of a well meaning joiner.
- A rated leaf hung in an untested frame is not a fire door. Certification belongs to the whole assembly, so a part replacement usually voids it.
Short version: the inspection itself is cheap and takes minutes per door. What costs money is the small number of doors that turn out never to have been compliant in the first place.
Fire door inspection is one of the few property compliance jobs where the standard is written down and the frequency is fixed by law. The checks themselves need nothing more sophisticated than a tape measure. Owners still get caught out, and almost always for the same reason: the inspection finds that a door which looked fine was never a certified assembly to begin with.
What an inspection ends in
Every door check lands in one of three places, and knowing which is which controls the budget.
A pass is the straightforward one. The leaf closes fully from any angle, the seals are intact and unpainted, the ironmongery is complete and the gaps measure up. Record it and move on.
An adjustment is the commonest outcome, and usually cheap. A self closing device that has lost its power, hinge screws that have worked loose, a strip painted over during a redecoration, a leaf that has dropped and now catches. These are afternoon jobs for a competent contractor and they do not affect certification.
Replacement is where the money sits, and where specification matters most. A certified doorset from a manufacturer such as Black Steel Doors arrives as a tested assembly, with the leaf, frame, glazing and ironmongery all covered by the same evidence, rather than as a leaf that then has to be made compliant on site. Buying the parts separately is how buildings end up with doors that carry a rating on paper and nothing in reality.
The distinction matters because part replacement is tempting and rarely valid. Swap the glass in a glazed fire door for ordinary toughened glass, or rehang a rated leaf in a frame that was never tested with it, and the certificate stops describing the thing on the wall.
Who has to inspect, and how often
The duties in England come from regulation 10 of the Fire Safety (England) Regulations 2022, and they are keyed to building height rather than to the number of flats.
For multi occupied residential buildings with a storey over 11 metres, the responsible person must undertake quarterly checks of all fire doors in the common parts, including their self closing devices, and must undertake annual checks of flat entrance doors that open onto those common parts, on a best endeavours basis. The regulation itself is short and worth reading in full.
Below 11 metres, the quarterly and annual requirements do not bite, though the responsible person still carries the general fire precautions duties, which cover fire doors. And in every multi occupied residential building with two or more domestic premises, whatever its height, residents have to be given information about why fire doors matter and why they must not be wedged open.
| Building | Common parts doors | Flat entrance doors | Resident information |
|---|---|---|---|
| Storey over 11m | Quarterly | Annually, best endeavours | Required |
| Under 11m, 2+ dwellings | General duty applies | General duty applies | Required |
| Single private dwelling | No statutory regime | No statutory regime | Not applicable |
“Best endeavours” is doing real work in that table. Nobody is entitled to force entry to a flat, so the test becomes whether the attempts were genuine, repeated and written down. Which is why the record keeping stops being administrative padding. The government’s fact sheet on regulation 10 sets out what a reasonable attempt looks like.
The checklist, and the four millimetre problem
The official checks are unglamorous and take a couple of minutes per door once you know them. Look for a door that has been swapped for a non fire door, which happens more often in flats than anyone expects. Check the letterbox closes and has not been jammed. Look for damage to the leaf, the frame or the surrounding wall. Check the condition of any fire resisting glass and its glazing system. Check the hinges and ironmongery for missing or loose screws. Check the intumescent strips and smoke seals are undamaged, in contact with the edge and not painted over. Then open the door to any angle, let go, and watch whether it closes fully into the frame.
The measurement is where inspections turn adversarial. Industry standard is that the gap between door and frame should never be more than 4mm, with the gap at the bottom of the door as small as practicable. Four millimetres is about two pound coins stacked, and the fussiness is mechanical rather than bureaucratic: the intumescent strip expands to seal the gap, and it can only seal a gap it can bridge.
Which is why the most damaging repair on any building is a leaf that was planed down to fit a frame that had gone out of square. It solves a sticking door and quietly moves the assembly outside the conditions it was tested under. Nothing on site looks wrong afterwards, which is the problem.
If you have never seen how a certified doorset is put together, this manufacturer walkthrough shows what the inspection is actually measuring against.
Video: https://youtu.be/rMdkbUKezuo
Why the records are worth keeping properly
Every check should produce a dated record naming the door, the person who checked it, what was found and what was done. Keep it with the rest of the building’s fire safety information.
The obvious reason is enforcement. The less obvious one is that the file is the only thing that turns a pile of individual checks into evidence of a system. An inspector, an insurer or a buyer’s surveyor asking about fire doors gets a very different answer from an owner who can produce four quarterly records and a schedule of remedial work, versus one who can produce an assurance.
Fire doors belong to the same family as the household checks that take minutes and then get skipped for years, like the three minute check that stops a tumble dryer catching fire. The difference is that with fire doors somebody is named in law as the person who has to do it.
Inspection is the cheap half of this. Doors that were never certified assemblies are the expensive half, and the only way to find out which you own is to go and measure them.
