Fire and regulator consultation as building height rises
Cross 18 metres or seven storeys and the consultation list changes. Here is what each height threshold adds, how to measure it, and how to programme the responses.
The height threshold fire consultation that matters most in England arrives at 18 metres or seven storeys, whichever comes first. Cross either and the application needs a fire statement, the Health and Safety Executive becomes a statutory consultee through the Building Safety Regulator, and the determination programme lengthens. Below that line the consultation list for a residential scheme is driven by unit numbers and site area instead. Above it, height itself starts adding consultees, assessments and design scrutiny that a five-storey version of the same scheme would never attract.
The awkward part is that the thresholds do not line up. Planning, building control, London policy and local plan tall building policy each use a different measure, and a scheme can sit on the right side of one and the wrong side of another.
Where height changes the consultation list
| Height or storey count | What it triggers |
|---|---|
| Above 11 metres | Sprinkler provision in blocks of flats under Approved Document B |
| 18 metres or more, or seven or more storeys | Fire statement under Article 9A of the Development Management Procedure Order 2015 and consultation with the Health and Safety Executive at Planning Gateway One |
| 18 metres or more, with at least two residential units | Higher-risk building for Gateways Two and Three under the Building Safety Act 2022 |
| Above 18 metres, new residential | Second staircase provision, confirmed in 2024 with transitional arrangements; verify the current Approved Document B text and the transitional dates |
| Above 30 metres outside the City of London | Referable to the Mayor under the Town and Country Planning (Mayor of London) Order 2008 |
| The local plan's own tall building definition | Design review, townscape and visual assessment, and often a wind and microclimate study |
The building regulations rows are not planning consultations, but they shape the scheme the application has to show, which is why they belong in the same table.
The fire statement duty and the moment it bites
Article 9A requires a fire statement for any application involving a relevant building, meaning a building containing two or more dwellings or educational accommodation at 18 metres or more in height or with seven or more storeys. The form is the one published by the Secretary of State, and it has to be completed by a competent person.
The statement is a planning-stage document. It deals with site layout, fire service vehicle access and standing positions, water supplies for firefighting, core and staircase arrangement as a plan matter, external wall construction principles and the evacuation strategy at the level of principle. It does not need detailed compartmentation or smoke modelling, which belong at Gateway Two. Our guide to the Fire Statement sets out what goes in each section.
The consultation response is advice rather than a veto, and it is a material consideration. In practice authorities wait for it. Build four to six weeks into the programme for the response and a further exchange, and assume the exchange will happen because first responses frequently ask for the appliance access to be drawn rather than described.
Storey counting and how to measure
Height for Article 9A is measured from ground level to the floor surface of the top storey, and roof-top plant is excluded. Storey counting excludes a top storey used only for plant and machinery. On a sloping site, ground level is not a single number, and a scheme can be a relevant building measured from the lower side and not from the upper.
Show the measurement. A dimensioned section through the tallest part, with the datum stated and the top storey floor level annotated, saves an argument at validation. Schemes within a metre of 18 metres should carry that section from the first submission, because a validation officer who cannot find the dimension will ask, and the eight-week clock does not start until the application is valid.
And watch the storey limb independently. A seven-storey building at 17 metres is caught even though it sits below the height figure, which surprises designers who have only the metric threshold in mind.
Local plan definitions of a tall building
There is no national definition. Policy D9 of the London Plan 2021 requires boroughs to define what constitutes a tall building for their area and to identify where tall buildings are appropriate, which means the trigger height varies between adjacent boroughs. Outside London, many local plans carry a similar definition expressed either as a metre figure or as a number of storeys above the prevailing context.
Find the definition before you fix the massing. Crossing it usually brings a townscape and visual impact assessment, verified views from agreed locations, a wind and microclimate study and design review, none of which can be added late without cost. Where the plan expresses the threshold relative to surrounding context rather than as an absolute figure, ask the case officer at pre-application what baseline they apply.
Design review and the non-statutory consultees
Design review panels are not statutory consultees, but a scheme that crosses a local tall building definition will usually be sent to one, and the panel's report is published and quoted in the officer report. Treat it as a stage in the programme rather than an optional extra. Two sessions is common, one at concept and one on the developed scheme.
The fire and rescue authority is not a statutory planning consultee under the Development Management Procedure Order, and its formal role sits at building control stage. Some authorities consult it informally on tall residential schemes anyway, and in London the fire authority's comments on access and water supply appear in officer reports. Where appliance access is tight, an early informal conversation is worth more than a late formal objection.
Active Travel England becomes a statutory consultee for major residential development at the 150-unit threshold, which often coincides with height on a dense urban site. The wider pattern of consultees appearing as numbers grow is set out in our note on statutory consultees that appear as a scheme grows, and the London referral position in the note on mayoral referral thresholds.
Daylight, wind and the assessments height triggers
Height changes the amenity evidence in three ways. The scheme casts further, so overshadowing and sunlight to neighbouring gardens and amenity space come into play at distances that a low-rise scheme would not reach. Internal daylight to the lower floors of the proposal itself becomes harder where the building forms a courtyard. And pedestrian level wind conditions start to matter once the building stands clear of its context.
A Daylight and Sunlight Assessment prepared to BRE 209 is the normal evidence for the first two. For wind, a Wind Microclimate Assessment using the Lawson comfort criteria is what London boroughs and an increasing number of other authorities ask for, with wind tunnel testing rather than modelling alone on the larger schemes.
Overheating is the quiet one. Upper floors of a tall residential building with single-aspect flats and limited openable area are the hardest cases under CIBSE TM59, and the mitigation hierarchy may push you towards deeper reveals or external shading that changes the elevations. Run the overheating model before the facade is designed, not after.
Programming the responses
Illustrative example. A 19.4 metre, seven-storey block of 96 flats on a brownfield site outside London, within a local plan tall building definition set at six storeys. The consultation programme runs as follows. Pre-application in month one, including an informal fire access discussion. Design review at concept in month two. Fire statement prepared alongside the developed layout in month three, with the appliance standing position drawn against the actual kerb radii. Submission in month four. Health and Safety Executive response in month five, requesting confirmation of the dry riser inlet location relative to the standing position. Second design review report published in month five. Committee in month seven. The figures here are illustrative rather than drawn from a decided application.
Two habits make that programme hold. Draw the fire service access before the landscape design is signed off, because trees, cycle stores and attenuation features compete for the same ground. And keep one site plan as the single coordinated version that the fire statement, the transport work and the landscape drawings all reference, so that a consultee comparing three documents sees the same standing position in each.
This is general guidance, not legal advice; check the thresholds and current guidance with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. A Fire Statement is a report type where a competent professional is legally required, so a draft is a starting point for that professional rather than a substitute.
Enter your postcode on PlanScope to see which reports a scheme at your height and unit count is likely to need.
Frequently asked questions
At what height does a planning application need a fire statement?
At 18 metres or more in height, or seven or more storeys, for a building containing two or more dwellings or educational accommodation. Either limb is enough on its own, so a seven-storey building below 18 metres is still a relevant building under Article 9A of the Development Management Procedure Order 2015 and needs the published form completed by a competent person.
How is height measured for the 18 metre threshold?
From ground level to the floor surface of the top storey, excluding roof-top plant and machinery. Storey counting excludes a top storey used only for plant. On a sloping site ground level is not a single figure, so show a dimensioned section with the datum stated. Schemes within a metre of the threshold should carry that section from first submission.
Is the fire and rescue authority a statutory planning consultee?
No. Its formal role sits at building control stage rather than in the planning process under the Development Management Procedure Order. Some authorities consult it informally on tall residential schemes, and its comments on appliance access and water supply do appear in officer reports, so an early conversation is worth having where access is tight.
What counts as a tall building?
There is no national definition. Policy D9 of the London Plan 2021 requires boroughs to define it for their area, and many local plans outside London do the same, either as a metre figure or as storeys above the prevailing context. Crossing the local definition usually brings design review, townscape assessment and a wind microclimate study.
How long does the Gateway One consultation add to a determination?
Allow four to six weeks for the Health and Safety Executive response, plus time for at least one exchange. First responses commonly ask for fire service access and standing positions to be drawn rather than described, so preparing that drawing in advance is the single most effective way to keep the programme on track.
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.