The Building Safety Act gateways explained for applicants

The Building Safety Act 2022 framework applies three control points to tall residential buildings, and they sit in three different regimes. Gateway One is a planning requirement, delivered through article 9A of the Development Management Procedure Order 2015 and enforced at validation. Gateways Two and Three are building control requirements administered by the health and safety regulator, before construction starts and before occupation.

Most of the trouble applicants get into comes from treating the three as one scheme with one threshold. They are not, and the definitions differ.

Gateway One and the fire statement

Where an application for planning permission involves the provision of a relevant building, a fire statement must accompany the application. The authority will not validate without it, and the regulator is a statutory consultee on those applications.

The fire statement is a planning document. It addresses the matters that planning can influence: the siting of the building, access for fire appliances, the provision and siting of water supplies for firefighting, the layout of the site around the building, and the principles of the fire strategy so far as they affect the external envelope and the site. It is not a full fire engineering strategy, and it is not a building control submission.

The regulator's comments come back as a consultation response and are reported to the decision maker like any other consultee response. A response raising substantive concerns about access or water supplies is difficult to resolve by condition, because it usually implies a layout change.

Write the statement early enough that it can change the layout. A statement written after the site plan is frozen documents a problem instead of preventing one, and that is the scope and content point applicants most often get backwards.

Which buildings are caught

Two definitions operate, and they are not interchangeable.

The planning stage definition of a relevant building is set out for the purposes of the fire statement requirement and is framed around height or number of storeys together with the presence of a stated number of dwellings or educational accommodation.

The building control definition of a higher-risk building is set out separately under the 2022 Act framework and is framed around height or storeys together with the presence of at least two residential units.

They overlap heavily and they are not identical. The practical discipline is to check the scheme against each definition in its own words, and to record the conclusion in the project file with the measurement that supports it.

Height is the input people get wrong. It is measured to the floor surface of the top storey rather than to the ridge or the parapet, and storeys consisting only of plant or machinery are normally left out of the count. A scheme drawn at just under the threshold deserves a measured check rather than a glance at the section.

Gateway Two, before construction

For a higher-risk building, an application for building control approval goes to the regulator, and construction cannot begin until approval is granted.

The submission is substantial. It covers the design, the competence declarations, the strategy for managing change, and the arrangements for the golden thread of information that has to be maintained through the project. Determination takes a statutory period, and in practice requests for further information extend it.

Two programme consequences follow. Design has to be far more complete before a start on site than contractors are used to, which pushes cost and time into the pre-construction phase. And change control during construction is formal, with major changes requiring approval before they are built, so the habit of resolving details on site does not survive contact with the regime.

Applicants sometimes assume Gateway Two can run in parallel with the planning application. It can be prepared in parallel, and the design work overlaps usefully with the higher-risk building threshold consequences for planning, but approval is still a precondition of starting.

Gateway Three, before occupation

At the end of construction a completion certificate application goes to the regulator, supported by the record of what was actually built, including the change control history.

The building then has to be registered before it is occupied. That sequencing is what makes the end of the programme as controlled as the beginning, and it removes the option of phased occupation while snagging continues in the way developers have managed it previously.

Plan the handover documentation from day one. The information the regulator wants at Gateway Three is the information that should have been captured continuously, and assembling it retrospectively is slow and expensive.

The golden thread runs through all of this. It is the requirement to create, maintain and hand over accurate building information in a structured form, from design through construction into occupation. Practically it means the project needs a document management discipline from the first design package, with named responsibilities, rather than a scramble to compile a file at the end. Teams that treat it as an information management workstream cope. Teams that treat it as a deliverable do not.

Where applicants misread the thresholds

Four recurring errors, all of them avoidable with a measured check and half an hour reading the definitions.

Measuring to the ridge instead of the top storey floor level, which puts a scheme in or out of scope wrongly.

Counting a rooftop plant enclosure as a storey, or failing to count a mezzanine that is one.

Assuming that a conversion is outside the regime because the building already exists. A change of use that creates residential units in a tall building can bring it into scope.

Treating the fire statement as a form. It is a substantive document that a specialist consultee will read, and a thin one invites a holding objection.

A fifth, less obvious, is assuming that a scheme falling outside both definitions has no fire safety dimension at planning stage. Access for fire appliances, hydrant provision and the space around a building are planning matters on any scheme, and a highway layout that cannot take a pumping appliance is a problem whether or not a gateway applies.

How it affects the programme

For a scheme in scope, add real time at three points: before submission, for the fire statement and the layout iterations it may cause; after planning permission, for the Gateway Two submission and determination; and at the end, for completion certification and registration.

The honest position on durations is that they have been longer than the framework's statutory periods imply, so build contingency rather than planning to the minimum. Follow developments through the planning law updates timeline.

PlanScope drafts the planning stage documents, including the Fire Statement, for review by someone with the necessary fire engineering competence, and you can enter a postcode on the home page to see which reports a scheme is likely to need. 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 required at Planning Gateway One for relevant buildings and must be prepared by someone with fire engineering competence, so treat a draft as a starting point for that professional. This is general guidance, not legal advice, so check the position with your local planning authority before relying on it.