Apply for Gateway 3 completion certificate

What is Gateway 3?

Gateway 3 is the final mandatory checkpoint before anyone can occupy a new higher-risk building. The Building Safety Regulator (BSR) must issue a completion certificate confirming that the building as constructed meets all applicable building regulations and the conditions of the Gateway 2 approval.

Allowing residents to occupy a higher-risk building without a Gateway 3 completion certificate is a criminal offence punishable by unlimited fines and imprisonment. There are no exceptions - the BSR will not issue retrospective certificates, and occupation without the certificate exposes the client and duty holders to prosecution.

When to submit your Gateway 3 application

The statutory determination period for Gateway 3 is 8 weeks. However, you should plan for longer:

• Submit your application at least 12 weeks before your intended first occupation date
• Allow additional time for BSR queries and requests for clarification
• Do not promise handover dates to buyers or tenants based on the minimum 8-week period
• Ensure all construction work, snagging, and commissioning is genuinely complete before submitting

If your development will be completed in phases, you may need to apply for separate Gateway 3 certificates for each phase. Discuss phasing with the BSR early in your project.

Who must sign the Gateway 3 application

The Gateway 3 completion certificate application requires signatures from three parties, each confirming that the building as constructed complies with building regulations. This shared accountability is a deliberate feature of the Building Safety Act.

What each signatory is confirming

By signing the Gateway 3 application, each party declares that:

• The building as constructed complies with all applicable building regulations
• The work has been carried out in accordance with the Gateway 2 approved plans (with any approved changes properly documented)
• All duty holder obligations have been discharged

Signing a false declaration is a criminal offence. Before signing, each party must be genuinely satisfied that the building meets requirements. If you have concerns about any aspect of the construction, raise them before signing - not after.

If a duty holder has changed during the project

On long-running projects, the Principal Designer or Principal Contractor may change. If this happens:

• The current duty holder signs for the work under their control
• Arrangements must be made for previous duty holders to sign for their phase of work
• The golden thread must record when changes occurred and who was responsible for each phase

Documentation required for Gateway 3

The Gateway 3 application must include comprehensive evidence that the building has been constructed safely and in compliance with building regulations.

As-built information

• Complete as-built drawings showing the building as actually constructed
• All variations from the Gateway 2 approved design, with evidence of proper change control
• Structural as-built records including any variations from design
• Services installations as actually installed

Fire safety information

• Final fire safety strategy reflecting the as-built building
• Fire detection and alarm system commissioning certificates
• Sprinkler system commissioning certificates (where installed)
• Smoke control system commissioning certificates
• Fire door installation certificates
• Compartmentation survey results
• Evacuation procedures for the building

Golden thread records

• Complete golden thread from design through construction
• Change control log showing all approved changes
• Product certifications for all safety-critical materials
• Test results and inspection records
• Competence declarations for all duty holders

Handover documentation

• Health and safety file for the Accountable Person
• Operation and maintenance manuals for all building systems
• Resident safety information pack
• Initial safety case report (or information to enable its preparation)

What the BSR assesses

The BSR will review your Gateway 3 application against the Gateway 2 approved design and all applicable building regulations. The assessment focuses on:

• whether the building has been built as approved, with all changes documented and authorised
• whether fire systems work as designed, compartmentation is intact and means of escape are adequate
• whether the structure has been built as designed
• whether the golden thread is complete and accurate
• whether there is enough information for the Accountable Person to manage the building safely

The BSR may conduct a physical inspection of the building as part of the assessment.

Common reasons for Gateway 3 rejection or delay

• gaps in the golden thread, such as missing construction records, test certificates or change control logs
• design changes made during construction without going through change control
• fire systems not properly commissioned, compartmentation breaches or inadequate means of escape
• one of the three signatories being unable or unwilling to sign
• too little handover information for the Accountable Person to manage building safety
• outstanding snagging that affects safety, so the building is not genuinely complete

If the BSR refuses a completion certificate, you can challenge the decision: you have 21 days to request a review by the regulator, and if you remain dissatisfied, a further 21 days after the review decision to appeal to the First-tier Tribunal (regulations 48 and 49 of the Building (Higher-Risk Buildings Procedures) (England) Regulations 2023). In practice, resolving the issues identified by the BSR and resubmitting is usually faster. Either route can delay occupation by weeks or months.

Penalties for occupation without Gateway 3

Allowing occupation without a Gateway 3 completion certificate is among the most serious offences under the Building Safety Act. The BSR will prosecute where buildings are occupied without proper certification.

This applies to all occupation - you cannot allow "early access" or "permitted entry" without the certificate. Marketing suites within the building may also require BSR consideration.