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.

This guide explains what you must submit, who must sign the application, what the BSR assesses, and how to prepare for a successful submission.

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

Partial completion: 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

Criminal liability: 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.

1. 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

2. 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

3. 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

4. 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:

• Compliance with approved design: Has the building been built as approved? Are all changes properly documented and authorised?
• Fire safety: Do fire systems work as designed? Is compartmentation intact? Are means of escape adequate?
• Structural safety: Has the structure been built as designed? Are there any structural concerns?
• Golden thread completeness: Is the digital record comprehensive and accurate?
• Handover readiness: Is there sufficient 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

• Incomplete golden thread: Gaps in construction records, missing test certificates, or incomplete change control logs
• Unapproved design changes: Changes made during construction that were not properly authorised through the change control process
• Deficient fire safety: Fire systems not properly commissioned, compartmentation breaches, or inadequate means of escape
• Missing signatory: One of the three required signatories unable or unwilling to sign the application
• Inadequate handover documentation: Insufficient information for the Accountable Person to manage building safety
• Outstanding remedial work: Building not genuinely complete - snagging items affecting safety

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