What is a gateway 2 application?
Understanding Gateway 2 Approval for Higher-Risk Building Projects
A Gateway 2 application is the formal building control approval application made to the Building Safety Regulator before building work starts on a Higher-Risk Building where the work falls within the higher-risk building control regime. It is one of the most important approval stages introduced by the Building Safety Act 2022 and places far greater emphasis on design completeness, coordination, evidence and dutyholder accountability before construction begins.
For clients, developers and leaseholders planning work within an HRB, the first step is to establish whether the building and the proposed work fall within the regime. Our High Risk Building Hub brings together our wider guidance, while our Gateway 2 Application services explain how we prepare and manage submissions. Where a project needs statutory design leadership, we can also act as Principal Designer for Building Regulations .
Folly Architects has developed a UK-leading specialist service for Higher-Risk Building projects, particularly complex refurbishments, alterations and apartment projects within occupied residential buildings. We can manage the Gateway process as a whole: advising at Gateway 1 where relevant, preparing and submitting Gateway 2 applications, coordinating the design team through construction and change control, and leading the information required for Gateway 3 and the completion certificate application.
This article explains what Gateway 2 is, when it is required, what information the Building Safety Regulator expects and why successful applications depend on much more than simply uploading a set of drawings.
What Gateway 2 Actually Means
Gateway 2 is the pre-construction building control approval stage for work within the higher-risk building regime. The Building Safety Regulator is the building control authority for this work in England, and building work that requires approval cannot lawfully begin until that approval has been granted.
The important change is not simply who reviews the application. Gateway 2 requires the design team to demonstrate, in a structured and evidence-led way, how the proposed work complies with the Building Regulations. The submission therefore needs to describe not only what is being built, but how the design has been coordinated, who is responsible for it, how changes will be controlled and how compliance will be maintained during construction.
This is why Gateway 2 should be treated as a design-management process rather than a final administrative task. On our Knightsbridge Gateway 2 project , for example, the architectural, structural, MEP, fire and heritage information had to be brought together into one coherent regulatory package before submission.
When Is a Gateway 2 Application Required?
For existing Higher-Risk Buildings, building control approval is generally required before carrying out building work unless the project consists only of work that is exempt, carried out through an applicable Competent Person Scheme, or falls within another specific statutory exception. New Higher-Risk Buildings and work that creates or removes HRB status also fall within the Building Safety Regulator's building control regime.
This distinction matters because an internal flat refurbishment can still trigger the Gateway process. Changes to compartmentation, fire doors, structural elements, drainage, services, ventilation, protected routes or other regulated construction can bring a project within the regime even where the work appears relatively small in architectural terms.
Where the position is unclear, the safest approach is to establish the regulatory status before design work progresses too far. Our article on assessing HRB risk before commitment explains why early review can prevent abortive design work, programme disruption and unexpected regulatory costs.
What Information Is Needed for Gateway 2?
A robust Gateway 2 submission normally combines detailed design information with statutory management documents. The exact package depends on whether the application relates to a new HRB, work to an existing HRB and the category and nature of that work, but the principle is consistent: the BSR needs enough information to understand the work and assess compliance before construction starts.
Typical information may include coordinated architectural drawings, structural and MEP design, fire strategy or fire compliance information, specifications, schedules, design assumptions and evidence against the relevant requirements of the Building Regulations. Depending on the application, supporting documents can also include a change control plan, construction control plan, mandatory occurrence reporting arrangements, competence information and a fire and emergency file or other prescribed fire information.
The quality of coordination is critical. A fire strategy that describes one arrangement while the architectural drawings show another, or structural information that does not align with the proposed fire protection, can undermine the entire submission. Gateway 2 therefore places a premium on design resolution and cross-consultant review.
The Principal Designer and Gateway 2
The Building Regulations Principal Designer has a central role in planning, managing and monitoring the design work so that, if built, it complies with the Building Regulations. On HRB projects this often means establishing the regulatory strategy, coordinating designers, reviewing consultant information and ensuring the Gateway submission tells one consistent technical story.
Folly Architects is regularly appointed to take control of projects where the design has already been partly developed by others. Our Principal Designer takeover case study explains how we review inherited information, identify gaps and re-establish a workable Gateway strategy before submission.
For clients who prefer a single point of responsibility, we can manage the complete process: architectural coordination, Principal Designer duties, consultant reviews, Gateway documentation, submission to the BSR, responses during assessment, change control during construction and preparation for Gateway 3.
Frequently asked questions
The following questions and answers summarise common queries relating to this topic.
A Gateway 2 application is the building control approval application made to the Building Safety Regulator before relevant building work starts on a Higher-Risk Building. It must demonstrate, through coordinated design and supporting information, how the proposed work complies with the Building Regulations.
No. Where the work requires building control approval under the Higher-Risk Building regime, it must not start until the Building Safety Regulator has granted approval. Starting controlled work without the required approval can expose the client and project team to enforcement and significant programme risk.
The exact requirements depend on the project, but a submission will normally include coordinated design information and relevant supporting documents such as fire information, structural and MEP design, specifications, compliance evidence, change control arrangements, competence information and other prescribed management documents.
There is no single reliable project duration. The statutory framework includes determination periods, but complex applications can take longer in practice, particularly where the BSR requires additional information or multidisciplinary assessment. A realistic programme should allow regulatory contingency and sufficient time to prepare a complete submission before it is lodged.
Yes. Folly Architects can advise on Gateway 1 where relevant, prepare and manage Gateway 2 applications, act as Principal Designer for Building Regulations, coordinate design and change control during construction, and manage the information required for Gateway 3 and the completion certificate application. We can provide a defined package or manage the complete HRB regulatory process.
What Happens After Submission?
The BSR first checks whether the application is valid and contains the required information. A valid application then proceeds to technical assessment, which may involve a multidisciplinary team and requests for clarification or further evidence. Validation should not be confused with approval: it simply confirms that the application can enter the assessment process.
Good preparation can materially reduce avoidable delay, but Gateway 2 should never be programmed like a conventional local-authority Building Regulations application. The BSR's own published data has shown that determination periods can extend well beyond the headline statutory periods on complex cases, so clients should build realistic regulatory contingency into their programme.
Our experience includes projects that have achieved rapid validation, as well as more complex schemes requiring extensive coordination and regulator engagement. We also support projects moving from older building control arrangements into BSR oversight, as described in From Approved Inspector to Building Safety Regulator .
Gateway 2 Is Not the End of the Process
Once approval is granted, the project moves into a controlled construction phase. Significant design changes may need to be notified to or approved by the BSR, and the design and construction team must maintain the information needed to demonstrate what has actually been built.
This matters because Gateway 3 is the completion stage. The completion certificate application must be supported by accurate as-built information and the relevant dutyholder declarations and records. A project that treats Gateway 2 as a one-off submission but fails to maintain change control during construction can create serious problems at Gateway 3.
Our approach is therefore to plan Gateway 2 and Gateway 3 together. The aim is to establish an approval strategy at the beginning, maintain the golden thread through construction and arrive at completion with the evidence already organised rather than attempting to reconstruct it retrospectively.
How Folly Architects Can Help
Gateway applications are specialist regulatory work, but they are also fundamentally about architecture, technical design and coordination. Our role is to make the process understandable for the client while giving the BSR a clear, well-structured and technically credible submission.
We provide UK-leading specialist support across Gateway 1, Gateway 2 and Gateway 3, and can either advise on a particular stage or manage the whole process from initial HRB assessment through to completion. This can include design review, Building Regulations Principal Designer services, consultant coordination, regulatory documentation, BSR submission management, construction-stage change control and Gateway 3 close-out.
If you are planning work in a Higher-Risk Building, early advice is particularly valuable. Establishing the correct route before construction starts is considerably simpler than trying to regularise an HRB project after work has begun.
Contact us
If you would like to discuss a project, clarify regulatory requirements, or understand how our experience may be relevant to your work, you are welcome to get in touch.
