What changes after planning at Gateway Two and Three

Planning permission on a higher-risk building settles the shape of the thing and very little about whether it can be built. Gateway One, the planning stage, fixes the site layout, the massing, the access for fire appliances and the broad principle that a workable fire strategy exists. Gateway Two and Gateway Three are run by the Building Safety Regulator, not the local planning authority, and they are hard stops. No construction before Gateway Two approval, and no occupation before the Gateway Three completion certificate.

The difference between Gateway Two and Gateway Three matters most for programme. Developers who treat them as building control sign-offs that happen alongside the works discover that one of them has to happen before the works and the other before anyone moves in.

The three gateways and who runs each

The framework comes from the Building Safety Act 2022 and the regulations made under it, principally the Building (Higher-Risk Buildings Procedures) (England) Regulations 2023. A higher-risk building for these purposes is one at least 18 metres in height or with at least seven storeys, containing at least two residential units, with care homes and hospitals brought in for the design and construction phase.

The Building Safety Regulator replaced local authority and approved inspector building control for higher-risk buildings entirely. There is no choice of body and no route back to the local authority.

Alongside the gateways sit the dutyholder roles in the Building Regulations: client, principal designer and principal contractor, each with competence and coordination duties, and the golden thread obligation to keep structured, accessible and current information about the building through design, construction and occupation.

What Gateway One fixes and what it leaves open

Gateway One is a planning consultation. The Fire Statement submitted with the application addresses the matters the regulator is consulted on, which are the site-level and layout-level questions: access and water supplies for the fire service, the principles of escape, the position of the building relative to boundaries and other structures, and whether the general approach to fire safety is plausible for the form proposed.

What it does not do is approve the fire strategy. A Fire Statement is not a Fire Safety Strategy under BS 9991 or BS 9999, and the HSE's response at Gateway One does not bind the Building Safety Regulator at Gateway Two. Both the Fire Statement and the strategy are documents where fire-engineering competence is legally expected: a Fire Statement is required to be prepared by someone with the necessary competence, and an AI-assisted draft is a starting point for that professional rather than a substitute for their judgement.

The practical reading is that Gateway One protects you against the layout mistakes that cannot be fixed later, such as a single point of access to a tall building, an appliance route that cannot carry the load, or a scheme that puts a tower too close to a boundary for the escape strategy to work. Everything downstream of that remains open.

The Gateway Two application and its effect on programme

Gateway Two is a building control approval application to the regulator, submitted with the full design information required by the procedural regulations: drawings, specifications, the fire and structural strategies, the construction control plan, the change control plan, the mandatory occurrence reporting plan and the competence declarations for the dutyholders.

The statutory determination period is 12 weeks for a new higher-risk building and 8 weeks for work to an existing one, running from a valid application. Extensions can be agreed, and the regulator can reject an application as invalid, which restarts the clock. Check the current published periods and validation requirements before fixing a programme, because the procedural detail has moved since the regime took effect.

Three programme consequences follow.

The first is that design completion moves earlier. Gateway Two expects the design to be substantially complete, which means the specialist subcontract design that traditionally ran alongside early works has to be resolved before a start on site. That changes procurement as well as programme.

The second is that there is no partial start. Enabling works, demolition and some groundworks may be outside the higher-risk building control application, but the building itself cannot start. Scheme phasing and the definition of what counts as the building become live commercial questions.

The third is cost of carry. A 12-week determination period with a possible extension, following a design completion milestone that is itself months earlier than traditional practice, lengthens the period between land acquisition and income. Price it rather than assume it.

Change control during construction

The regime that surprises contractors most is change control. Under the procedural regulations, changes to the approved design fall into three categories, and the category decides what you have to do.

Major changes require an application to the regulator and approval before the change is made. These are the changes that affect the fire or structural strategy, the building's height or storeys, the number of residential units, or other matters specified in the regulations.

Notifiable changes must be notified to the regulator before the change is made, with a stated period before work on that element proceeds.

Recorded changes are logged in the change control log, which forms part of the golden thread, and are not individually submitted.

The practical effect is that value engineering after Gateway Two is expensive in time as well as in money. A substitution that changes a fire-rated element, a façade build-up or a smoke control system is not a drawing revision. Plan the design so that the elements most likely to be substituted are resolved and approved first.

Gateway Three and occupation

At completion, the principal contractor and principal designer provide their declarations, the client applies for a completion certificate, and the regulator decides whether the building has been built in accordance with the approved documents and the Building Regulations. The golden thread information has to be handed over in the required form.

Occupation without a completion certificate is an offence, and the building must also be registered with the regulator before occupation begins, which is a separate step from the certificate. For a build-to-sell scheme, that sequence sits directly in front of legal completions, which means it sits directly in front of the funding exit.

Partial occupation of a phased building is possible in principle but needs to be structured into the application from the outset rather than requested at the end. If the commercial plan depends on occupying the lower floors while the upper floors finish, raise it at Gateway Two.

Where a planning change triggers rework

The awkward interactions run in both directions.

A change required by the regulator at Gateway Two can breach the planning permission. A taller plant enclosure to accommodate a smoke ventilation system, an additional external stair, a wider firefighting shaft that pushes the core and loses a unit, or a façade change driven by combustibility rules can all take the scheme outside the approved drawings. The fix is a non-material amendment under section 96A of the Town and Country Planning Act 1990 where the change really is minor, or a section 73 application to vary a condition where it is not, and both take time the construction programme has not allowed for.

Equally, a planning-driven change after Gateway Two approval, for example a condition discharge that requires a different cladding specification or a landscape change that affects appliance access, becomes a change control item. The two consent regimes are not coordinated, so somebody on the team has to hold both sets of drawings in view.

Where a scheme is close to a threshold, the thresholds themselves deserve checking: 18 metres measured as the regulations require, seven storeys counted as the regulations require, and at least two residential units. A scheme designed at 17.8 metres that gains a parapet upstand in detailed design has changed regime.

Programme assumptions worth testing early

Four assumptions in a typical development appraisal are the ones that break on a higher-risk building.

1. That design completion happens during early works. It does not. Build the appraisal around a substantially complete design before start on site.
2. That building control runs concurrently with construction. Gateway Two precedes it.
3. That value engineering is available during construction. It is, subject to a change control process with approval periods attached.
4. That practical completion and occupation are close together. Gateway Three and registration sit between them.

Test those four against a realistic determination period, then add the planning amendment risk on top. The report index sets out which documents sit at the planning stage, and the structural and ground documents that feed both regimes are covered in a structural appraisal of a building proposed for retention and sequencing a basement excavation in a terraced street.

This is general guidance, not legal advice; check the position with the Building Safety Regulator, your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.