The Complete Guide to Gateway 2: What to Submit, When and How

Gateway 2 is the most consequential regulatory checkpoint in the life of a higher-risk building project. It is the point at which the Building Safety Regulator (BSR) must be satisfied — before a single foundation is dug — that the building, as designed, will comply with the Building Regulations in full. Get it right and your project proceeds on schedule. Get it wrong and you face requisitions, delays and, potentially, a fundamental redesign.

This guide sets out what Gateway 2 is, when it applies, what you must submit, how the BSR assesses applications, and — critically — how to avoid the most common reasons for requisitions.

What Is Gateway 2 and When Does It Apply?

Gateway 2 is the Building Control Approval stage under the Building Safety Act 2022 (BSA 2022). It is mandatory for all higher-risk buildings (HRBs) in England — defined under section 65 of the Act as buildings that are at least 18 metres in height or have at least 7 storeys, and contain two or more residential units.

The requirement flows from Regulation 4(3) of the Higher-Risk Buildings (Key Building Information etc.) (England) Regulations 2023 and the Higher-Risk Buildings (Descriptions and Supplementary Provisions) Regulations 2023. For these buildings, the BSR is the sole Building Control Authority. Local authority building control and approved inspectors have no jurisdiction.

The fundamental rule is straightforward: no work may commence on an HRB until Gateway 2 approval has been granted by the BSR. This is not a procedural formality — it is a hard legal stop. Commencing work without approval is a criminal offence under section 35 of the Building Act 1984 as amended.

The obligation to apply arises at full plans stage, once the design has reached sufficient technical maturity to demonstrate compliance. In practice, this means the application should be submitted no earlier than RIBA Stage 4 (Technical Design), when structural and fire engineering strategies have been developed and the design is substantially complete.

What Documents Must Be Submitted?

The BSR's Gateway 2 submission requirements are set out in the Building (Higher-Risk Buildings Procedures) (England) Regulations 2023 (SI 2023/909). The core submission must include:

Building Regulations Compliance Statements

A compliance statement for each applicable Approved Document — Parts A through T. Each statement must explain, by reference to the design, how the building will meet the requirements of the relevant Part. Generic statements or template-based documents are routinely rejected. The BSR expects statements that are specific to the building, evidenced by drawings and calculations, and authored by suitably competent individuals.

The most demanding statements are typically Part A (Structure), Part B (Fire Safety), Part L (Conservation of Fuel and Power) and Part O (Overheating). Part B in particular requires a full fire safety strategy, coordinated with the architectural and structural design and referencing the applicable standards (BS 9991:2024 for residential buildings; BS 9999 where appropriate).

Structural Strategy and Fire Safety Strategy

These are standalone documents that sit alongside and underpin the compliance statements. The structural strategy should address the primary structural system, disproportionate collapse design in accordance with Approved Document A, robustness categorisation (Category 3 for buildings over 15 storeys) and any key engineering assumptions. The fire safety strategy must address means of escape, fire detection and alarm, suppression, firefighter access, smoke control and compartmentation — all coordinated with the architectural design.

Design Documents

Drawings, specifications and schedules at a level of detail sufficient to demonstrate compliance. The BSR expects general arrangement drawings, floor plans, sections, elevations and key construction details. MEP schematics should be included where relevant to compliance — for example, ventilation layouts relevant to Part F, or electrical layouts relevant to Part P.

Duty Holder Appointments and Competence Evidence

The submission must include details of all duty holders appointed under the Building Safety Act — the Principal Designer (Building Regulations), the Principal Contractor and any other relevant appointments. For each, evidence of competence must be provided. The BSR expects this to reference the relevant frameworks: BSI Flex 8670 for individual competence; the PAS 8672 framework for organisations. Simple CVs or professional body memberships are rarely sufficient on their own.

Construction Control Plan (CCP) and Mandatory Occurrence Reporting (MOR) Plan

The CCP sets out how construction will be managed and monitored to ensure the approved design is faithfully built. The MOR plan describes how reportable occurrences will be identified, assessed and reported to the BSR during construction. Both documents must be project-specific and credible.

Fire and Emergency File

A document setting out the fire safety information relevant to the completed building, intended to support the Building Safety Case at Gateway 3. It should be started at Gateway 2 and completed as construction progresses.

The BSR's Assessment Process and Timescales

Once submitted, the BSR has a statutory period of 8 weeks to determine the application, extendable to 12 weeks by agreement or in complex cases. In practice, the BSR's published guidance indicates that applications for complex HRBs routinely take the full 12 weeks or beyond, particularly where the submission is incomplete or raises queries.

The assessment is conducted by the BSR's Higher-Risk Buildings Assessments team. Assessors will review the compliance statements against the design documents, test the internal consistency of the submission (does the fire strategy match the drawings? does the structural strategy reflect the specification?), and assess the competence evidence for duty holders.

Requisitions — formal requests for further information — pause the clock. A single requisition can therefore extend the overall timescale significantly. The BSR has made clear that it will not grant approval on incomplete or inadequate submissions and that it will issue requisitions rather than make assumptions on the applicant's behalf.

The Most Common Reasons for Requisitions

Based on experience of BSR submissions across a range of HRB projects, the following categories account for the majority of requisitions:

• Incomplete or generic compliance statements. Statements that do not address the specific design, that rely on boilerplate language, or that fail to evidence compliance by reference to drawings and calculations.
• Inconsistencies between documents. The fire strategy does not match the architectural drawings; the structural strategy references a different specification version; the MOR plan references a duty holder not listed in the appointment documents.
• Weak or insufficient duty holder competence evidence. CVs without reference to specific competence frameworks; organisations appointed without demonstrating a structured quality management system; Principal Designer appointments made to individuals without evidence of HRB-specific experience.
• Insufficient drawing package. Drawings at too small a scale; missing construction details; no indication of fire compartmentation on floor plans; MEP schematics absent where required.
• Inadequate CCP or MOR plan. Generic documents copied from previous projects; no project-specific change control triggers; no named individuals responsible for MOR reporting.

Tips for a Clean First Submission

The goal should always be to achieve approval without requisitions. The following practices significantly improve the likelihood of a clean first pass:

1. Start the compliance process at RIBA Stage 1. Compliance statements cannot be retrofitted at Stage 4. The design decisions that determine compliance — structural system, fire strategy, means of escape, compartmentation — are made at Stages 1 to 3. A compliance consultant embedded in the design team from the outset will identify risks before they become submission problems.
2. Commission a pre-submission review. An independent review of the draft submission package — checking internal consistency, completeness and quality of evidence — before submission to the BSR is highly effective at identifying issues that will draw requisitions.
3. Ensure duty holder appointments are in place early. The Principal Designer (Building Regulations) should be appointed no later than Stage 3. Competence evidence should be assembled in parallel with the design, not retrospectively.
4. Write compliance statements to the specific building. Each statement should open with a description of the relevant aspect of the building's design and then work methodically through the requirements of the Approved Document, demonstrating compliance by reference to specific drawings, calculations and specifications.
5. Maintain version control across all documents. The BSR will identify inconsistencies between documents issued at different dates. A single version-controlled document set submitted together is far more robust than a package assembled from documents with different revision dates.

Applicable Legislation and Guidance

Gateway 2 is the defining regulatory moment for any higher-risk building project. The quality of the submission package determines not just whether approval is granted — but the speed at which it is granted, and the confidence with which the construction phase begins. Investment in a structured, well-evidenced submission is always repaid.