Fire statements and the 1,000 square metre residential flag
The statutory fire statement trigger is height, not floorspace. Here is what the 1,000 square metre figure actually does, how it is measured, and how the two tests interact.
There is no statutory fire statement trigger at 1,000 square metres. The legal requirement for a fire statement with a planning application turns on the relevant building definition, which is a building containing two or more dwellings, or educational accommodation, at 18 metres or more in height or with seven or more storeys. So where does the 1,000 square metre figure come from? It is a flagging threshold, used by checking tools and by some local validation lists as the point at which a residential scheme is large enough that fire safety should be considered explicitly. Knowing which is which saves an argument at validation.
Where the floorspace figure comes from
One thousand square metres appears in the planning system as part of the definition of major development, alongside 10 or more dwellings and sites of a hectare or more. It is a scale threshold, and it brings the longer determination period, wider publicity and a heavier validation list.
Fire safety attaches to that scale threshold only indirectly. A residential scheme creating 1,000 square metres or more is large enough that a council may ask about fire service access, water supply and the fire strategy through its local list, and PlanScope uses that figure as one of the thresholds it applies when flagging which reports a scheme is likely to need.
Councils' own validation lists and the statutory requirements take precedence over any automated flag. Check the list for the authority you are applying to before deciding what the application needs. Local lists are published documents and they vary more than most applicants expect, particularly on fire service access details and water supply confirmation for larger residential schemes.
How floorspace is measured for scale thresholds
Gross internal floorspace created by the development, measured to the internal face of external walls, including all storeys.
Three points cause arguments. Whether existing floorspace being replaced is netted off, which depends on how the authority applies its threshold. Whether ancillary areas such as plant rooms, bin stores and cycle stores count, which usually they do where they are internal to the building. And whether basement areas count, which they do.
For a mixed use building, be clear about what is being measured: the whole building, or the residential element. The answer changes the result on most podium schemes, and the application form should be consistent with the planning statement.
| Figure | Where it matters |
|---|---|
| 1,000 m2 of floorspace created | Major development, validation lists, report flagging |
| 10 or more dwellings | Major development, affordable housing policy |
| 18 m height or 7 storeys | Statutory fire statement requirement |
| 11 m height | Building Regulations provisions, checked separately |
The relationship with the height based definition
A building can be large without being tall. A three storey block of flats with 1,500 square metres of floorspace is major development, likely to attract questions about fire service access, and is not a relevant building. No fire statement is required with the application.
A building can be tall without being large. A slender block reaching seven storeys with a small floorplate is a relevant building, and a fire statement is required, whatever its floorspace.
The two tests answer different questions. Scale thresholds tell you how the application will be processed. The relevant building test tells you whether the Building Safety Regulator will be consulted on fire safety at planning stage.
That distinction has a practical edge. A design team that assumes a floorspace figure triggers the fire statement will produce a document nobody asked for, on a form that does not apply, and may still have failed to answer the access and water supply questions the council actually raised. The reverse error is worse: a tall slender block assumed to be outside the regime because it is small.
Mixed use buildings and the residential element
Where flats sit above commercial floorspace, the residential element governs whether the building contains two or more dwellings, and the height test then applies to the building as a whole. Commercial floorspace does not take the building outside the requirement.
For scale thresholds, mixed use schemes are usually assessed on total floorspace created, with the residential unit count applied separately. It is the sort of point that costs a week at validation if the form and the statement disagree, and an article on committee referral thresholds and delegated decisions sets out how scale also drives who takes the decision.
What has to accompany an application at this scale
For a major residential application that is not a relevant building, expect the local list to ask for some or all of the following. Check the list rather than working from memory.
- A site layout showing fire appliance access, turning and hydrant positions.
- Confirmation of water supply arrangements with the undertaker.
- A Statement of Community Involvement where the authority requires one at this scale.
- An Affordable Housing Statement where the unit count engages policy.
- Drainage, transport and ecology evidence proportionate to the scheme.
Where the building is a relevant building, the fire statement is submitted on the published form and the Health and Safety Executive is consulted as the Building Safety Regulator. That consultation affects the determination timetable, so build it into the programme rather than treating it as a background process.
Recording the calculation in the submission
- State gross internal floorspace created, by use, with a schedule by storey.
- State the number of dwellings and whether any existing units are lost.
- State the building height to the top storey floor level and the storey count.
- Say explicitly whether the building meets the relevant building definition, and why.
- Cross-check the figures on the application form, the drawings and the planning statement.
Point five is the one that fails applications. A form stating 980 square metres, a drawing schedule totalling 1,040 and a statement describing a major scheme will be returned, and the eight weeks starts again when it is resubmitted.
Keep the floorspace schedule as a separate short document, storey by storey and use by use, and refer to it from the planning statement. Officers check it, objectors check it, and on a scheme sitting close to a threshold it is the first thing anyone asks for. It also settles the question quickly if the council's own measurement differs from yours.
Building Regulations thresholds run on their own track again, with provisions that bite at heights below 18 metres and requirements that have changed in recent years. Those are checked at building control stage, and they are not a reason to submit or withhold a planning fire statement.
An illustrative example: a four storey block of 16 flats at 1,350 square metres, 13 metres high, is major development and not a relevant building. The validation list may still ask for fire appliance access details on the layout, and the design team should provide them because building control will require compliance regardless.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
PlanScope flags a fire statement for consideration on larger residential schemes, and the statutory requirement and the council's validation list take precedence over any flag. Enter your postcode on PlanScope to see which reports your site needs.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Is a fire statement required at 1,000 square metres?
Not by statute. The requirement applies to relevant buildings, meaning buildings containing two or more dwellings or educational accommodation at 18 metres or more in height or with seven or more storeys. The floorspace figure is a scale threshold used for major development and by some validation lists and checking tools.
How is floorspace measured for the threshold?
As gross internal floorspace created, measured to the internal face of external walls and including all storeys, with basements counted. Internal ancillary areas such as plant rooms, bin stores and cycle stores usually count. Whether replaced floorspace is netted off depends on how the authority applies its own threshold.
Can a large building avoid the fire statement requirement?
A building can be large without being tall. A three storey block of flats with 1,500 square metres of floorspace is major development but not a relevant building, so no fire statement accompanies the application. Fire service access and water supply may still be asked for through the local validation list.
What does the requirement mean for the determination timetable?
Where a fire statement is required, the Health and Safety Executive is consulted as the Building Safety Regulator, and a request for further information will extend the process. Build the consultation into the programme, and submit a statement that answers the standard questions rather than one that invites a holding response.
Which figures should the application state?
Gross internal floorspace created by use with a schedule by storey, the number of dwellings, the height to the top storey floor level, and the storey count. State whether the building meets the relevant building definition and why. Make sure the form, the drawings and the planning statement all carry the same numbers.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.