Last reviewed: 2026-07-12 · Checked against the primary sources cited below · Editorial policy
In a block of flats, flat entrance doors are typically FD30S (E30Sa) with a self-closing device, while communal doors — stair, lobby, corridor, riser and plant-room doors — are specified by the building's fire strategy, often FD30S or FD60S where they protect the escape stair or a compartment. In England, for residential buildings over 11 metres, Regulation 10 requires communal fire doors to be checked at least every 3 months and flat entrance doors at least every 12 months (best endeavours). The fire risk assessment governs each door's rating.
- FD30S (E30Sa) with a self-closing device is Approved Document B's benchmark for a new or replacement flat entrance doorset separating a flat from a space in common use — the fire strategy may require more.
- Communal doors are set by the fire strategy: stair, lobby and corridor doors are frequently FD30S, rising to FD60S where they protect an escape stair or a compartment boundary; there is no single rule of thumb.
- Regulation 10 of the Fire Safety (England) Regulations 2022 — for residential buildings over 11 metres in England — requires communal fire doors to be checked at least every 3 months and flat entrance doors at least every 12 months on a best-endeavours basis.
- 18 metres or 7 storeys (with at least two residential units) makes a block a higher-risk building under the Building Safety Act 2022, bringing the golden-thread and safety-case regime.
- The 'S' in FD30S means cold-smoke seals — smoke control, not insulation. It does not change the 30-minute integrity rating; FD30S corresponds to E30Sa, and is not the same as an insulated EI30 door.
- Devolved nations differ: the 2022 Regulations and Approved Document B apply in England only. Wales has its own Approved Document B, Scotland uses Technical Handbooks, and Northern Ireland has its own regime.
What fire doors does a block of flats need?
A block of flats is protected by a chain of fire doors, not a single door type. Most purpose-built blocks rely on a 'stay put' strategy, where each flat is a fire-resisting compartment and residents in unaffected flats can remain in place while the fire is contained. That strategy only holds if every door in the chain performs. Alongside the private flat entrance doors, the communal areas contain doors whose job is to protect the escape stair and keep smoke out of the routes everyone shares.
The doors a typical block relies on include:
- Flat entrance doors — the compartment boundary between each flat and the common parts, normally FD30S (E30Sa) with a self-closing device.
- Stair and lobby doors — protecting the escape stair from smoke, often FD30S but FD60S where the fire strategy calls for it.
- Corridor and cross-corridor doors — sub-dividing common corridors so smoke cannot travel the full length of a route.
- Riser, service and cupboard doors — enclosing vertical service shafts, meter cupboards and refuse chutes that can spread fire between storeys.
- Basement and plant-room doors — protecting escape routes from higher fire-load areas such as boiler rooms, sprinkler tanks and car parks.
Flat entrance doors versus communal fire doors
Two families of door sit in a block, and the law treats them differently. Understanding the split matters for both specification and for who is responsible for checking them.
Flat entrance doors
The front door of each flat is a compartment boundary: it must hold fire and smoke inside the flat of origin so the corridor and stair stay usable. Approved Document B's benchmark for a new or replacement flat entrance doorset is FD30S (E30Sa) with a self-closing device. Since Section 1 of the Fire Safety Act 2021, it is beyond doubt that these doors fall within the Regulatory Reform (Fire Safety) Order 2005 in any building with two or more sets of domestic premises, so they must feature in the fire risk assessment even where each door belongs to a leaseholder.
Communal fire doors
Doors in the common parts — stair, lobby, corridor, riser and plant-room doors — protect the shared escape routes. They take far heavier daily use than a flat entrance door, so they are checked more often (see below). Where a communal door protects the single escape stair or forms a compartment boundary, the fire strategy may specify FD60S rather than FD30S. Self-closers on these doors are essential; a communal fire door propped or wedged open defeats the smoke control it exists to provide.
How often must fire doors in a block of flats be checked?
Regulation 10 of the Fire Safety (England) Regulations 2022, in force since 23 January 2023, sets minimum check frequencies — but only for residential buildings in England containing two or more sets of domestic premises and standing over 11 metres in height. In those buildings the responsible person must carry out the checks described in the Regulation 10 guide.
| Door | Minimum interval (England, over 11m) | Standard |
|---|---|---|
| Communal fire doors (stair, lobby, corridor, riser) | At least every 3 months | Routine check of the door and its self-closer |
| Flat entrance fire doors | At least every 12 months | Best endeavours to check each door |
'Best endeavours' recognises that flat entrance doors are private property and the responsible person cannot always gain access; the duty is to make genuine, repeated attempts to check them. The check confirms the door, frame, seals, hinges, glazing and self-closing device are present and in working order.
Higher-risk buildings and the Building Safety Act
Taller blocks carry extra duties. Under the Building Safety Act 2022, a block is a higher-risk building where it is at least 18 metres in height or has at least 7 storeys, and contains at least two residential units. For these buildings the accountable person must register the building, maintain the 'golden thread' of building-safety information and hold a safety case demonstrating that fire and structural risks are being managed. Fire doors are a core part of that evidence.
- The golden thread should capture each doorset's specification, fire-resistance rating, certification and installation and inspection records — see the Building Safety Act fire door guide.
- Compartmentation in a higher-risk block depends on doors performing as a tested doorset (leaf, frame, seals and hardware together), not on a leaf alone.
- Replacement and remedial works to fire doors should be documented so the safety case stays current and auditable.
Specifying and scheduling every doorset in the block
A block has dozens or hundreds of doors, each with its own required rating, self-closing needs, smoke sealing and inspection interval. Recording them consistently is what turns a fire strategy into something you can procure, install and audit. Build a door-by-door schedule with the fire door and doorset schedule tool, then keep every door on the right check cycle using the Regulation 10 checks guide.
- Record each door's location, required rating (FD30S / FD60S), smoke seals and self-closer, cross-referenced to the fire strategy.
- Distinguish communal doors (3-monthly checks) from flat entrance doors (12-monthly, best endeavours) so nothing slips the schedule.
- Keep certification and installation evidence for each doorset to support the fire risk assessment and, in higher-risk buildings, the golden thread.
- Flag any non-original or upgraded doors for assessment — a repainted, trimmed or altered door may no longer meet its rating.
Frequently asked questions
What fire rating should a flat entrance door have in a block of flats?
Approved Document B's benchmark for a new or replacement flat entrance doorset is FD30S (E30Sa) with a self-closing device. That is a minimum, not a ceiling — the building's fire risk assessment and fire strategy may require a higher-performing door depending on height, layout and compartmentation. Always confirm the required rating against the fire strategy for your specific building.
How often must communal fire doors in a block of flats be checked?
In England, for residential buildings over 11 metres, Regulation 10 of the Fire Safety (England) Regulations 2022 requires communal fire doors to be checked at least every 3 months, and flat entrance doors at least every 12 months on a best-endeavours basis. Below 11 metres, and in Wales, Scotland and Northern Ireland, there is no fixed statutory interval — the fire risk assessment sets the frequency.
When is a block of flats a higher-risk building?
Under the Building Safety Act 2022, a block is a higher-risk building if it is at least 18 metres tall or has at least 7 storeys and contains at least two residential units. Higher-risk buildings must be registered, and the accountable person must maintain the golden thread of safety information and a safety case. This 18-metre threshold is separate from the 11-metre trigger for Regulation 10 checks.
Is an FD30S door the same as an insulated EI30 door?
No. FD30S is a fire door offering 30 minutes of integrity plus cold-smoke seals, and corresponds to E30Sa. An EI30 door adds an insulation criterion — the 'I' — which limits heat transfer through the door, a separate and additional performance. The two are not equivalent, and the fire strategy determines whether integrity or integrity-plus-insulation is required for a given opening.