Passive Fire Protection in London
Passive Fire Protection London — FIRAS Certified Fire Stopping, Survey-First Quotes
Failed a fire door inspection? Got an FRA action list with fire stopping flagged, or a compliance deadline closing in? We supply and fit passive fire protection across London, East London, North London and South East London — fire stopping, cavity barriers and compartmentation surveyed first, with a fixed quote agreed before anyone touches the building.
- Survey-first fixed quotes
- IFC and FIRAS certificated installers
- BS EN 1366 tested fire barrier systems
- Fire stopping of service penetrations near doors
- Photographic completion records supplied
Inspection reports, installation records and compliance documentation are supplied as applicable to the work completed. Serving London, East London, North London, South East London, South West London and surrounding areas.
Accredited member of NAPFIS — The Home of Passive Fire Control
Passive Fire Protection — at a glance
A fire door has one job: to hold back fire and smoke long enough for people to get out and for the fire to stay contained where it started. FD30 doors are tested to resist fire for 30 minutes, FD60 for 60.
- Areas covered
- London, East London, North London, South East London
- Common work
- Fire Stopping of Service Penetrations, Compartmentation Integrity, Intumescent Sealant Application, Approved Document B Compliance
- Same-day service
- Usually available
- Quote before work
- Yes — fixed price, no obligation
Quick answer
Passive fire protection covers the fire stopping, cavity barriers and compartment sealing that stop fire and smoke moving through gaps, joints and service penetrations - the stuff that has to work without anyone touching it. Most jobs start with pipes, cables or ducts punched through a wall or floor with no seal round them, or a linear gap along a wall head that's never been filled. We survey the compartment line, seal penetrations with tested mastic, batt or fire barrier systems, and hand over records showing what was done and where. If a compartment wall's got daylight through it, that's not a minor snag - it's a hole in the building's fire strategy.
Passive Fire Protection Problems We Find Across London
Passive fire protection work across Greater London often starts with a single call about a plant room door that's been chocked open for months, because nobody's quite sure whose job it is to keep it shut. That's passive fire protection in London in a nutshell - it's rarely one big dramatic failure. It's usually a handful of small things left too long: a gap round a pipe that was never packed properly, a wall that's been chased for cabling and never made good, a door held open with a fire extinguisher because the closer's knackered.
We hear the same worries on the phone. A managing agent's just had a fire risk assessment come back with action points they don't fully understand. A landlord's found out, mid-refurb, that the wall between two flats isn't doing what it's meant to. Someone doing cladding remediation work has opened up a void and found the compartment line isn't there at all. None of that's unusual for London stock - Victorian conversions in the inner boroughs, post-war estates across East London and South East London, plant rooms in commercial buildings where a fire door's been propped open so long it's part of the furniture.
What matters to us is getting under the surface rather than patching what's visible. A closed door means nothing if the sealing behind the frame's missing. We check what's actually there, not what's assumed, and that's the whole point of proper London fire door services - not a tick-box, a real look. Leave it, and the gap between what your building's supposed to do in a fire and what it'll actually do just keeps widening.
If a recent fire door survey flagged holes round the pipework in a riser cupboard, or a surveyor found gaps where cable bundles punch through a compartment wall, that's not a sign the building's falling apart - it's the single most common finding on this kind of stock, and it's entirely fixable. Every penetration through a fire-rated wall or floor - a soil pipe, a data cable run, a ventilation duct - has to be sealed back to the same fire rating as the wall it passes through. Miss that and the wall's doing nothing the moment smoke starts moving through the void behind it.
That's what passive fire protection London landlords and managing agents actually need once a compartment line's been broken by M&E works, and it's the backbone of what we do. We handle fire stopping of service penetrations using intumescent mastic and fire batt systems, close frame voids around door sets, run linear gap sealing along movement joints, and fit fire barrier and cavity barrier installation where a wall's been chased or cored for new services. Where a door's gone in after the wall was built, we check service penetration sealing near doors specifically - a gap we see constantly on commercial refurbishments and residential conversions.
Purpose-built blocks in East London and post-war council stock in South East London carry decades of these penetrations - some sealed properly, plenty patched years ago with expanding foam that does nothing in a real fire. A compartment line survey and fire stopping survey and assessment tells you exactly where the integrity's been broken, floor by floor, riser by riser. We work to BS EN 1366 tested systems and Approved Document B compliance, and that scope stretches to duct and service riser sealing, fire damper installation and testing, fire-rated glazing systems, and structural steel fire protection using mineral fibre and ablative coatings where the design calls for it. Roof voids get the same treatment - often the last place anyone checks.
Every job comes with photograph
Our London Passive Fire Protection Process
We start with a compartment line survey, not a quote. That means walking the building - risers, ceiling voids, plant rooms, the gaps around pipes and cables where they pass through fire-rated walls and floors - and checking whether compartmentation is actually intact or just assumed to be. On a lot of London stock, from Victorian conversions in the inner boroughs to post-war council blocks in East London, nobody's looked at what's behind the boxing-in for years.
Where we can't see a penetration properly, we use a borescope camera to check inside the void before opening anything up. Saves cutting into walls that don't need it, and it tells us exactly what we're dealing with - missing fire batts, old newspaper stuffed in a gap, cables run through with no sealant at all. It happens more than people think.
Every penetration seal, cavity barrier and linear joint gets specified against tested systems - BS EN 1366 evidence, matched to the actual construction, not a generic tube of mastic bought off a shelf. Intumescent sealant and fire batt systems go in around pipes and cables, mineral fibre and ablative coatings where structural steel needs protecting, and proper duct and riser sealing where services run floor to floor. Fire dampers get checked and tested, not just installed and left. Fire-rated glazing gets assessed the same way - a rated frame with the wrong glazing seal isn't a rated system, it's two components pretending to be one.
Doors and door frames come into this too. Service penetrations near a fire door - cable runs through a frame, a pipe boxed in beside a doorset - can undermine the door's rating even when the leaf itself is fine. Frame void fire stopping gets checked as part of the same survey, not treated as a separate job.
Everything gets photographed and location-marked as we go, so what you end up with is a proper record of where the work sits against Approved Document B - useful for your fire safety file, useful when a cladding remediation team or a managing agent needs evidence the compartment line's been reinstated, not just told it has. That paperwork is often what separates a building that sails through its next check from one that gets flagged again in twelve months.
Where London Passive Fire Protection Services Are Needed Most
Most fire spread in a block doesn't come through the front door - it comes through the gaps around it. Every time a plumber runs a new pipe through a compartment wall, or an electrician pulls cable through a riser, that hole needs sealing back to the same fire resistance as the wall or floor it passes through. Miss it, and you've got a break in your compartmentation that no amount of good fire doors will fix on its own.
We come across this all the time in post-war council stock across East London and South East London, where decades of maintenance work - new boilers, satellite dishes, data cabling - have left service penetrations packed with expanding foam, or left open altogether. Foam isn't a fire stopping product. It melts. Once you understand what fire stopping actually involves - sealing every penetration back to its tested fire rating with intumescent sealant, fire batts or cavity barriers - it's obvious why a foam-filled gap fails the moment someone checks it properly.
Composite fire doors in post-2000 developments often look the part, but the frame void behind the architrave - where the timber meets the masonry - gets left unsealed by installers who never thought of it as a fire stopping job at all. The same goes for linear gaps around ductwork running near a flat entrance door, or a cable tray punched through a riser cupboard wall right next to a rated doorset.
In commercial premises and plant rooms, steel fire doors are often doing exactly what they should while the wall they're set into has open penetrations either side of the frame - the door holds the line, but the compartment doesn't.
None of this shows up on a routine visual walk-round. It takes a proper compartment line survey to trace where the fire barrier actually runs and where someone's broken it without realising. Left as it is, a gap like that sits there quietly until an inspection or a cladding remediation project surfaces it - and by then it's holding up the whole building safety case, not just one flat.
Local knowledge
Fire Stopping Services London Buildings Need Now
Walk into a converted Edwardian terrace in West London and the compartment line often stops making sense the moment you get behind a boxed-in riser. Original brickwork gets punched through for a new soil pipe, a satellite cable, a boiler flue - and nobody seals it back to the standard the wall was built to hold. That gap round a pipe penetration is the same fire stopping problem whether it's one conversion flat or a nine-storey block, and it's the one thing a visual door check never catches, because it's hidden behind plasterboard.
South East London has plenty of post-war council stock where the story's different. Services run through solid concrete floors and walls, but the original fire batt or mastic has cracked, shrunk, or was never fitted as a proper BS EN 1366 tested system to begin with. Add cladding remediation works into the mix and you'll often find compartment lines opened up mid-project for insulation or cavity barrier installation, then not closed back up properly before the next trade moves in.
Commercial units bring a different pattern again - plant rooms with steel fire doors wedged open, duct and riser penetrations sealed years back with whatever was to hand rather than a tested product. None of it shows up on a door inspection sheet. It only surfaces once someone actually surveys the compartment line itself, walls and floors included, not just the doors sitting on it.
If your last check stopped at the doors, you've only had half the picture. Worth finding out what's actually behind them.
Recognise the problem?
If one of these sounds like your situation, start there — each walks through the likely causes, how urgent it is, and the fix.
Not Sure Where Your Compartmentation Stands?
If you're reading this after totting up doors, risers and roof voids across a block in South West London or Central London, you probably already suspect gaps in the compartment line somewhere. Guessing isn't good enough with Regulation 10 on the table. Request a fire door survey and written quote, and we'll tell you exactly what's failed, what's borderline, and what it'll cost to put right.
Fire Compartmentation London: Common Questions
What is fire stopping and do I need it as well as fire doors?
Fire doors get all the attention because they're visible - you can see a gap, a bent hinge, a missing seal. Fire stopping is the bit nobody looks at until something goes wrong. Every time a pipe, cable tray or duct passes through a wall or floor that's meant to hold back fire for an hour or two, that penetration needs sealing back up to the same standard as the wall around it. Miss it, and the wall's rating means nothing - smoke and flame will just go round the barrier instead of through it.
So yes, you need both. A perfectly fitted fire door in a wall full of unsealed penetrations is still a compartment that fails. That's why a proper compartment line survey looks at the whole junction - the door, the frame void, and every service running past it. And it works both ways: fire stopping work often turns up doors that aren't fit for purpose either, which is where fire door fitting comes back into the conversation. If nobody's checked the gaps around your risers lately, it's worth finding out before an inspector does.
Can I get away without sealing every single penetration?
No - and this is where a lot of buildings come unstuck. A single unsealed cable penetration in a corridor wall breaks that wall's compartmentation completely, regardless of how solid the rest of it is. Inspectors and building control don't grade on a curve here. One gap, one failure. If your building's had cabling or plumbing work done since it was built, there's a good chance someone's drilled through a compartment wall and never sealed it back up properly.
Do I need a specialist for this or can a general contractor patch it up?
General builders can make a penetration look tidy without it doing anything useful in a fire. Proper fire stopping means using tested systems - intumescent mastic, fire batts, collars, wraps - matched to the specific penetration type and rated to BS EN 1366. A gap filled with standard mastic or expanding foam might pass a glance but won't hold under real conditions. If the seal isn't from a tested system with a Declaration of Performance behind it, you can't really call it fire stopping - it's decoration.
How disruptive is a fire stopping survey and remedial work?
Less than most people expect. A survey involves opening up suspect penetrations, checking risers, plant rooms and voids, and photographing everything with location mark-ups so you know exactly what's been checked and what needs doing. Remedial work is usually localised - sealing a penetration or fitting a cavity barrier doesn't mean ripping out walls. Where cladding remediation or other works are already underway, this kind of fire stopping often gets folded into the same access, which keeps things moving rather than adding a separate phase.
What paperwork should I actually get at the end?
You should get inspection reports and installation records that show what was found, what was done, and photographic evidence tied to specific locations - not a generic sign-off sheet. That's what a responsible person needs on file for a Regulation 10 routine check or a wider compliance review, and it's what shows up when a building's fire safety case gets scrutinised. Documentation supplied should match the actual work completed - nothing more, nothing less. If your building doesn't have that on file for its compartment lines, that's a gap worth closing before an inspector finds it for you.
Get a Written Quote for Your Fire Stopping Work
If you've got compartment lines that need surveying, penetration seals that need doing properly, or a fire door programme running alongside it, get a written quote before anything's booked in. We'll set out the scope - batts, mastic, cavity barriers, whatever the survey turns up - so you know exactly what's being done and why.
Get in touch and we'll put a quote together for your building, whether that's a block in Croydon or a commercial unit in Hackney.