Documents for a residential building of 18 metres or more

A residential building of 18 metres or more in height, or seven or more storeys, containing two or more dwellings is a relevant building for Planning Gateway One. The application must be accompanied by a fire statement on the form published by the Secretary of State, and the local planning authority must consult the Health and Safety Executive as the Building Safety Regulator before determining it. That requirement comes from Article 9A of the Town and Country Planning (Development Management Procedure) (England) Order 2015, inserted as part of the Building Safety Act 2022 reforms.

Height is measured from ground level to the floor surface of the top storey, ignoring any storey that is a roof-top plant area or consists only of machinery. Get the measurement wrong and the application is invalid.

What the height threshold actually triggers

Three things happen at once. The fire statement becomes a validation requirement. The Building Safety Regulator becomes a statutory consultee with a period to respond. And the design has to be capable of satisfying Gateway Two at building control stage, which means the planning submission should not lock in an arrangement that later fails.

The regime applies to buildings containing two or more dwellings or educational accommodation. A single very tall house is not caught. Care homes and student accommodation need checking against the definitions rather than assumed in or out.

Existing buildings matter too. Works to an existing relevant building, including a material change of use creating dwellings in a building over the threshold, can bring the requirement into play.

The fire statement and the prescribed form

The fire statement must be on the form published by the Secretary of State. A narrative fire strategy document attached instead of the form is a common reason for a validation refusal.

The form asks about the principles of the fire safety design: the site layout, access and water supplies for the fire service, the construction approach including materials, means of escape and evacuation strategy, the fire safety systems proposed, and how the design affects the risk to people in and around the building.

It has to be prepared by someone with the necessary fire engineering competence. A Fire Statement drafted from structured data is a starting point for that professional rather than a substitute for them, and the Building Safety Act 2022 framework makes competence a legal requirement rather than a preference.

A fuller Fire Safety Strategy to BS 9991 usually sits behind the statement. It is not normally required at planning stage, though submitting it helps where the scheme has unusual features such as a single stair, a complex podium or a mixed-use base.

Building Safety Regulator consultation at Gateway One

The authority consults the regulator and must take the response into account. The regulator comments on the fire safety matters within its remit and does not determine the application.

What the regulator looks for is evidence that fire safety has informed the layout rather than been applied afterwards. Common comment areas are fire service vehicle access and hardstanding positions, the location and capacity of water supplies, the evacuation strategy and its consistency with the stair arrangement, external wall construction, and the relationship between the residential floors and any commercial or car parking use below.

Plan for the consultation period in the programme. Where the response raises a point, answering it well takes a design change rather than a letter, and that is easier before the committee date than after.

Submit drawings that show the fire service access route with turning and standing positions dimensioned, the dry or wet riser inlet locations, hydrant positions, and the stair and lobby arrangement at a readable scale.

Daylight, wind and overshadowing at this height

A building of 18 metres or more will usually need the full amenity evidence base.

• A Daylight and Sunlight Assessment covering neighbouring windows and the daylight to the new dwellings, to BRE 209 (2022) and BS EN 17037.
• A Wind Microclimate Assessment, normally wind tunnel or validated computational modelling, tested against the Lawson comfort criteria for the entrances, amenity terraces and surrounding pavements.
• An overshadowing study of neighbouring gardens and any public open space, with the two hour test on 21 March.
• A townscape and visual impact assessment with verified views, where the building is visible from protected vistas or from a conservation area.

In London, a building of this height may be referable to the Mayor depending on its scale and location, and the London Plan sets additional requirements on fire safety, whole life carbon and circular economy.

Energy and whole life carbon expectations

Tall residential buildings are usually assessed against a higher bar than their low-rise equivalents because they attract more policy attention and because the facade and servicing choices have large carbon consequences.

Expect an energy statement following the standard hierarchy, an overheating assessment, and in London a Whole Life Carbon Assessment prepared to the RICS methodology and a circular economy statement.

Overheating deserves particular attention at height. Opening restrictors, wind pressures on upper floors and external noise all constrain the ventilation strategy, and the mechanical cooling that follows has to be reconciled with the carbon target. Resolve it at planning stage, because retrofitting comfort cooling into a consented facade is expensive.

Fire service access and water supply evidence

Two practical items are often left until too late.

Fire service vehicle access needs a route capable of carrying a pumping appliance and, where the design relies on it, a high reach appliance, with hardstanding at the right distance from the building and turning provision. The geometry has to work with the landscape design, the podium structure and the tree planting, which is why the three are best drawn together.

Water supply means hydrants at the required spacing and a main of adequate capacity. The water undertaker will confirm flow and pressure, and where they are inadequate the remedy is a main upgrade with a lead time. Ask early.

Sequencing the pack around the consultee response

1. Appoint the fire engineer at concept stage, before the core and stair arrangement is fixed.
2. Fix the evacuation strategy, then the stair and lobby layout, then the unit layouts.
3. Run the wind modelling once the massing is stable, since it affects entrance positions and terrace design.
4. Prepare the fire statement on the prescribed form, with the supporting strategy behind it.
5. Submit, allowing time in the programme for the Building Safety Regulator response and any design response to it.
6. Keep the planning drawings consistent with the Gateway Two submission that will follow.

The last point is the one that costs money when missed. A planning permission that conflicts with what building control will accept at Gateway Two leads to a section 73 application and lost months.

Enter your postcode on PlanScope to see which reports a site is likely to need.

This is general guidance rather than legal advice. Check the position 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. For specialist technical reports, qualified professional input may be required.