What gateway two requires before construction starts
For a higher-risk building the Building Safety Regulator is the building control authority, and work cannot start until it has approved the design. That moves the design freeze months earlier.
Gateway two building control approval is the point at which a higher-risk building cannot start on site until the Building Safety Regulator has approved the design. There is no equivalent of starting work under an initial notice and resolving details later. The application goes in, the Regulator assesses it, and construction waits.
Developers who have only worked with local authority building control or a private approved inspector tend to underestimate this. The change is not procedural. It moves the design freeze forward by months and puts the burden of proof on the applicant.
Which buildings are in scope
The higher-risk building definition for design and construction covers buildings of at least 18 metres in height or at least seven storeys that contain at least two residential units, and also hospitals and care homes during the design and construction phase.
Height and storey counting has its own rules, and the difference between a scheme at 17.6 metres and one at 18.2 metres is the difference between two regimes. Establish the measurement early with the design team and record how it was done.
A building that crosses the threshold through a later design change moves into the regime at that point, which is an expensive way to find out. Where a scheme sits close to the threshold, treat the risk as live through the whole of the design stage.
What gateway two replaces
For a higher-risk building, the Building Safety Regulator is the building control authority. Local authority building control and registered building control approvers do not have jurisdiction over these buildings, so the familiar route of appointing your own inspector is not available.
Approval must be obtained before building work starts. The Regulator assesses whether the proposed work, as designed, would comply with the Building Regulations, and it can approve, approve with requirements, or reject.
Rejection is not a rare outcome for incomplete applications. The Regulator's stated approach is that an application which does not contain the required information will be rejected rather than developed through correspondence, so the completeness check matters as much as the technical content.
What the application has to contain
The package is larger than a traditional full plans submission. In broad terms it covers:
- Plans and specifications at a level of detail sufficient to demonstrate compliance, not a design intent set.
- A fire and emergency file setting out the fire safety design and how the building is intended to be used and managed.
- A construction control plan describing how compliance will be maintained on site.
- A change control plan explaining how design changes will be categorised, recorded and notified.
- A mandatory occurrence reporting plan.
- Competence declarations for the client, principal designer and principal contractor.
- A partial completion strategy where phased occupation is intended.
The fire strategy is the document that carries most of the weight. A Fire Safety Strategy developed to BS 9991 by a fire engineer, consistent with the architecture rather than appended to it, is what the assessment turns on. Late-stage strategies that contradict the drawings are the most common reason for a protracted assessment.
Timescales and what they do to a programme
The statutory assessment period is 12 weeks for a new higher-risk building and eight weeks for building work to an existing one, running from a valid application, and it can be extended by agreement.
Plan the programme on the basis that the period starts only when the Regulator accepts the application as valid. Work backwards from the intended start on site, add the assessment period, add a realistic allowance for responding to requests for further information, and then add the time the design team needs to reach the required level of detail in the first place.
| Stage | Practical programme effect |
|---|---|
| Reaching submission-level design | Months of coordinated design before any clock starts |
| Validity check | No statutory period runs until the application is accepted |
| Assessment period | 12 weeks for new build, eight weeks for work to an existing building |
| Requests for information | Extensions agreed case by case |
| Post-approval change control | Major changes need approval before work proceeds |
Contract strategy has to reflect that. A two-stage arrangement with an early contractor appointment gives you buildability input before the design freeze, which is worth more here than it is on a conventional scheme.
Change control after approval
Once approval is in place, changes fall into categories. Major changes require the Regulator's approval before the work is carried out. Notifiable changes must be notified. Other changes are recorded in the change control log and kept as part of the golden thread of information.
The categories are defined by the effect on compliance, not by value, so a small substitution in a cavity barrier specification can be a major change while an expensive kitchen rethink is not.
Set the change control plan up as something the site team will actually use. On projects where change control is treated as a document written for the application and then filed, the log diverges from the building, and that divergence surfaces at completion when it is hardest to fix.
The golden thread is the connected requirement. Information has to be kept accurate, accessible and in a format that can be handed over, which is a records management commitment for the life of the build rather than a one-off deliverable.
Where planning permission and building control collide
The two consents test different things, and a permission granted on one design can be undeliverable once the Regulator has finished with it.
Common collision points include escape stair width and the resulting core size, evacuation lift provision and where it lands in the plan, external wall materials and their effect on the approved elevations, and the location of firefighting shafts. Each of those can move a facade or a floor plate. Layout consequences of evacuation lift provision are particularly easy to underestimate at planning stage.
Where changes are needed, you are back in the planning system through a non-material amendment under section 96A of the Town and Country Planning Act 1990, or an application under section 73 to vary a condition, or a fresh application if the change is more than that. Each route has its own timetable, and none of them is instant.
Preparing at planning stage
Gateway one already requires a Fire Statement with the planning application for a relevant building, and the Health and Safety Executive is consulted on it. Treat that statement as the first step of a continuous fire strategy rather than as a validation document.
Three things at planning stage reduce gateway two risk more than anything else. Appoint the fire engineer before the massing is fixed rather than after. Test the core and stair arrangement against the escape strategy before the elevations are resolved. And agree with the design team how height will be measured and recorded, so the scheme's regime is not in doubt.
The Regulator assesses what is in front of it. A coherent, consistent, complete package assembled by a team that has worked to this regime before will move faster than an equally good building described badly.
Enter your postcode on PlanScope to see which supporting reports a residential scheme is likely to need at planning stage.
This is general guidance rather than legal advice. Check the position with the Building Safety Regulator, 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.
Frequently asked questions
Which buildings need gateway two approval?
Higher-risk buildings, meaning those at least 18 metres tall or of at least seven storeys containing two or more residential units, together with hospitals and care homes during design and construction. Height measurement rules matter where a scheme sits close to the threshold, because a later design change can bring a building into the regime unexpectedly.
How long does the Building Safety Regulator take?
The statutory assessment period is 12 weeks for a new higher-risk building and eight weeks for work to an existing one, running from a valid application and extendable by agreement. The clock does not start until the application is accepted as valid, so the completeness of the submission directly affects the programme.
Can a private building control approver be used instead?
No. For higher-risk buildings the Building Safety Regulator is the building control authority, so neither local authority building control nor a registered building control approver has jurisdiction. The familiar route of appointing your own inspector and resolving details during construction is not available under this regime.
What counts as a major change after approval?
A change categorised by its effect on compliance rather than by its cost. Major changes require the Regulator's approval before the work proceeds, notifiable changes must be notified, and other changes are recorded in the change control log. A minor specification substitution can be a major change while an expensive but compliant alteration is not.
Does gateway two affect the planning permission?
It can. Escape stair widths, evacuation lift positions, firefighting shafts and external wall materials can all move a facade or a floor plate. Those changes may need a non-material amendment under section 96A, an application under section 73 to vary a condition, or a fresh planning application, each with its own timetable.
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.