Fire door has the wrong lock, latch, letterplate or escape hardware in London

Someone's noticed the lock on a fire door doesn't look right. Maybe it's a standard nightlatch that came off a B&Q shelf, fitted to a flat entrance door that's supposed to be FD30. Maybe it's a letterplate with no intumescent lining behind it, or a latch that lets the door swing open again after it's been pulled shut. Sometimes it's flagged by a managing agent after an inspection. Sometimes it's a resident who just says "that doesn't feel right" and they're usually onto something.

This comes up constantly on Victorian and Edwardian conversion stock across inner London - East London, South East London - where flat entrance doors have been swapped out over the years by different landlords, different tenants, nobody keeping track of what's compliant and what isn't. It also shows up on post-2000 composite doors where the leaf itself is fine, tested, compliant, but someone's fitted a letterplate or handle set that was never part of the tested door assembly.

What it might mean

A few possibilities here, and none of them are certain until someone's actually looked at the door.

It's possible a non-fire-rated lock, latch or letterplate has been fitted at some point - sometimes during a refurb, sometimes just a replacement after a break-in where whoever did the work grabbed whatever hardware was on hand. It's also possible the existing latch isn't holding the door closed properly under normal use, which matters more than people think - a fire door that doesn't self-latch isn't doing its job even before you get to a fire.

There's a chance the escape-route hardware doesn't match how the door's actually used - a thumbturn where there should be a panic-friendly mechanism, for instance. And on doors that have had lock changes before, there's sometimes unprotected cut-outs left in the leaf from an old lock body that was never made good properly. Low confidence on that last one until someone checks the door itself, but it's more common than you'd expect on older communal doors.

How urgent is it?

Most of this is planned remedial work - you don't need someone round tonight for a letterplate that's slightly wrong. But there are situations where it moves up the list fast.

If the lock is stopping the door from being used as an escape route, if the latch won't hold the door shut at all, or if there's an actual gap through the leaf from an old cut-out - that's not a "get round to it" job. That's something to get looked at sooner rather than later, because you've potentially got an unprotected opening in what's meant to be a fire-separating door. Everything else - wrong hardware that's cosmetically fitted but the door still closes and latches fine - can usually wait for a proper survey to be booked in.

What you can safely check

Don't enlarge the lock cut-out yourself to fit new hardware - if there's existing evidence on the door about what it was tested with, you can destroy that by cutting further into the leaf. Keep hold of any old hardware, packaging or certification markings you've got, even if the lock's already been swapped - it helps whoever inspects it work out what should be there instead.

Worth noting whether the door in question is a flat entrance door, sits on a communal escape route, or is something like a service cupboard or plant room door - different doors carry different requirements, and that context speeds up any inspection.

What we check

A proper inspection starts with identifying the door's rating and what hardware it was actually tested with - a fire door isn't just the leaf, it's the leaf plus the specific ironmongery it was certified alongside. From there we check the lock, latch, letterplate and any escape hardware for markings that confirm they're fire-rated and compatible with that doorset.

We also look at the frame and leaf around any existing cut-outs - old lock bodies, previous letterplates, anything that's left a gap that needs making good before new hardware goes in. Then we specify fire-rated ironmongery and intumescent protection that actually matches the door, not just whatever's compliant in general terms. CE/UKCA-marked hardware with a Declaration of Performance and test evidence is what we're looking for, where it applies to that component.

How it's fixed

Where the hardware's wrong, it gets replaced with fire-rated lock, latch or letterplate hardware that matches the door's tested specification - not a generic "fire-rated" sticker, the actual assembly it was certified with. Any unprotected cut-outs from previous changes get made good as part of that work.

For blocks running through a wider upgrade - flat entrance doors across a whole stairwell, say - this is usually programmed in rather than done door by door, which keeps disruption down for residents and gives the managing agent one clear record of what's been done. That kind of work sits under fire door repairs, and inspection reports and installation records are supplied as applicable to what's actually carried out.

Call now if the lock won't hold the door closed, or if there's an escape door someone can't get through in an emergency. Everything else - wrong letterplate, hardware that looks off but the door still latches - book a survey and get it confirmed properly before your next inspection flags it for you.