HMO Fire Door Requirements London: FD30 & FD60 Explained

Which doors in an HMO actually need to be fire-rated

In a licensed HMO, any door opening onto the protected escape route, generally the hallway, landing or staircase that occupants use to get out, needs to be a fire door. In practice that covers every bedroom door, the kitchen door, and doors to any living room, bathroom or store cupboard that opens directly onto the stair or hallway. Doors within a single self-contained flat that isn't an HMO don't usually need the same treatment, which is a distinction landlords converting a house into an HMO sometimes miss: the requirement is triggered by the property becoming a house in multiple occupation with unrelated households sharing facilities, not by the age or type of the building.

The kitchen door gets treated as a priority in most fire strategies because kitchens are the most common source of accidental fire in a shared house. Where a fire strategy calls for a heat detector rather than a smoke detector in the kitchen, precisely because cooking triggers false alarms on optical smoke sensors, the kitchen door still needs the same FD30 rating as a bedroom door, since it's containing fire at its most likely source rather than reacting to where it eventually spreads. Communal doors, including the entrance to the property itself in some fire strategies, and doors to service risers, meter cupboards or boiler cupboards that open onto the escape route, also need to be fire-rated and self-closing, and these are frequently the doors that get missed because nobody thinks of a cupboard as part of the fire strategy.

FD30 versus FD60: what the numbers mean

FD30 and FD60 refer to the number of minutes a certified doorset is tested to hold back fire, 30 minutes or 60 minutes respectively. FD30 is the standard specification for bedroom, kitchen and most internal doors opening onto an HMO escape route, and it's what the great majority of fire risk assessments and licensing conditions specify for this type of door. FD60 is used less often in a typical converted house, generally reserved for higher-risk locations such as a door to a boiler room, a plant cupboard, or in some fire strategies for larger or more complex properties where the assessor has specified a longer holding time on a particular door.

The rating attaches to the whole doorset as tested, the leaf, the frame, the intumescent seals, the hinges and the self-closer together, not to the door leaf on its own. An FD30-rated blank hung in a standard frame with ordinary hinges and a domestic closer has no basis for being treated as a compliant fire door, whatever rating is printed on the leaf, because none of that combination was tested together. This is the single most common misunderstanding we come across on site: a landlord has bought a fire-rated door blank in good faith, had it fitted by a general joiner rather than someone working to fire door fitting standards, and ends up with something that looks right but fails the moment an inspector checks the gaps or asks for certification evidence.

Gap tolerances: the detail that decides whether a door passes

A certified fire door only performs to its rating if it's hung within the gap tolerances it was tested to, and this is where most inspection failures happen. The general standard most doorset manufacturers fit to is roughly 3mm at the head and both jambs, close enough that the intumescent seal in the door edge can expand and close the gap fully once it's exposed to heat. At the threshold, the tolerance is more generous, typically up to 8mm to 10mm under the door, since the seal arrangement at floor level works differently and some clearance is needed for the door to open and close over carpet or flooring.

Gaps that are noticeably wider than this, daylight visible around the frame when the door is closed, or a door that doesn't sit square in its opening, are one of the most common findings on a fire door survey. In Victorian and Edwardian conversions, original door openings are frequently out of square after a century of settlement, so a standard doorset dropped straight into the frame without packing or adjustment often ends up with gaps well outside tolerance on one side even where it looks fine on casual inspection. Fitting to the correct tolerance in an irregular opening usually means packing the frame, sometimes adjusting the brickwork reveal, and occasionally ordering a bespoke doorset sized to the actual opening rather than a standard width.

Self-closers and cold smoke seals

A self-closer has to pull the door fully closed onto the latch every time, not just most of the way. A closer set too weak leaves the door resting slightly open, which defeats the point of a fire door entirely, since fire and smoke pass through a door that isn't fully shut regardless of its rating. A closer that's too aggressive, closing too fast or slamming, can damage the frame or seal over time and is uncomfortable for tenants using the door daily, which is often why closers get disconnected or adjusted down by occupants rather than professionally serviced. Checking that a door latches fully shut under its own closer, without needing a shove, is one of the quickest checks anyone can do between formal inspections.

Cold smoke seals, usually a brush pile or a fin fitted into a groove around the door edge, block smoke at ambient temperature, before the intumescent strip has activated under heat. FD30s doors, the 's' denoting the smoke seal, are the specification most often required for bedroom doors in HMOs, since smoke inhalation rather than direct fire contact is the greater risk in the early stages of a fire. Both the intumescent strip and the cold smoke seal need to sit continuously around the door edge with no gaps or missing sections, and they need to be left unpainted. Redecoration is one of the most common causes of a previously compliant door failing a later inspection: painters covering the seal groove with gloss or masonry paint stops the seal expanding or sealing correctly, and it's a defect that's easy to introduce without anyone realising until the next check.

The most common HMO fire door inspection failures

Why a DIY or non-certified fire door installation costs more in the end

It's entirely possible to buy an FD30-rated door blank from a builders' merchant and hang it in an existing frame with standard hinges and a domestic closer, and from the landing it will look identical to a properly fitted fire door. The problem only shows up at inspection, when there's no certification evidence for the combination actually fitted, or when a fire risk assessor measures gaps that are outside tolerance because the frame wasn't packed or adjusted to suit. At that point the whole doorset usually has to come out and be refitted properly, which costs more overall than specifying it correctly the first time, on top of the delay to a licence renewal or the risk to an existing licence while the doors remain non-compliant.

Where an existing door is basically sound, the leaf itself is intact, the frame isn't badly out of square, but the seals, closer or ironmongery have failed or gone missing, repair is usually cheaper and less disruptive than full replacement, and it's the right first step before assuming every door on the list needs a new doorset. A fire door survey before any works are priced is what tells you which doors genuinely need replacing and which just need seals, a closer or a hinge adjustment.

What Lian Construction does and does not do on fire door compliance

We supply and fit certified FD30 and FD30s and FD60 fire doorsets, survey existing doors and grade each as compliant, repairable or requiring replacement, and provide a photographic record for your fire safety file or licensing submission. We work from the action list a fire risk assessment or your borough's HMO licensing checklist sets out, and we can talk through what a specific finding means in practical terms on site.

We are not a fire risk assessor, we don't carry out fire risk assessments ourselves, and we don't decide what a council will or won't accept at a licence inspection. Those decisions sit with the assessor who wrote the report and the local authority running the licensing scheme. Our part is making sure the doors on the list are specified, fitted and documented properly once the requirement has been set by someone qualified to set it, which for related fire safety and HMO scope more broadly is covered by our fire doors London, fire safety compliance London and HMO compliance London teams.

Fire doors as part of a wider compliance programme

Fire doors rarely sit in isolation on an action plan. They're usually specified alongside interlinked smoke and heat alarms, emergency lighting on escape routes, and fire-stopping to service penetrations through the same ceilings and floors the doors open onto, since all of these items are protecting the same escape route as one system rather than as separate boxes to tick. Where a landlord is working through a full FRA action plan or preparing for a licence renewal, it's usually more efficient to programme fire doors alongside the alarm and lighting work in one visit, rather than as a series of separate call-outs over several months. Our landlord fire safety checklist sets out how fire doors fit alongside alarms, emergency lighting and fire-stopping as one coordinated compliance programme.