Building Assessment Certificates: How to Prepare When the BSR Calls Your Building In

TL;DR: The Building Safety Regulator (BSR) is actively calling higher-risk buildings in for Building Assessment Certificate (BAC) applications. When your building is called in, you have 28 days to submit a complete application under section 79 of the Building Safety Act 2022. This is a substantive review of how you manage building safety -- not a formality. This guide covers what you need to prepare, the BSR's priority criteria, common reasons for refusal, and a practical checklist to get your building ready before the call-in letter arrives.

Check if your building qualifies as higher-risk -->

#What Is a Building Assessment Certificate?

A Building Assessment Certificate is confirmation from the BSR that the principal accountable person for a higher-risk building is complying with their duties under Part 4 of the Building Safety Act 2022. It is issued under section 79 of the Act after the BSR reviews your application and is satisfied that your building is being managed safely.

A Building Assessment Certificate confirms that the Building Safety Regulator has assessed a higher-risk building and is satisfied that the Accountable Person is managing building safety risks effectively.

— Building Safety Act 2022, s.91

The BAC is not an optional certification or a nice-to-have accreditation. Every higher-risk building on the BSR's register (section 78) will be called in for a BAC application. The question is not whether your building will be assessed, but when. For a detailed look at how the assessment process itself works and how to prepare your building before the call-in letter arrives, see our guide to the BSR assessment process.

The BAC process serves a dual purpose: it gives the BSR evidence that buildings are being managed safely, and it gives building managers a structured framework for demonstrating compliance. If your records are organised and your safety management is genuine, the application process will confirm what you already know. If there are gaps, the process will expose them -- better discovered during an application than during an emergency.

#When Will Your Building Be Called In?

The BSR began calling buildings in for BAC applications in April 2024 and is working through the registered building stock in priority order. As of early 2026, the BSR is prioritising:

The Principal Accountable Person must apply for a Building Assessment Certificate within 28 days of receiving a call-in notice from the Building Safety Regulator.

— Building Safety Act 2022, s.91

If your building falls into Groups 1-4, you may have already received a call-in notice or should expect one soon. If your building is a registered higher-risk building outside these groups, your call-in is coming -- use the time to prepare.

Important: These priority criteria reflect the BSR's published approach as of early 2026. The BSR may adjust its priorities based on emerging intelligence about building safety risks. Monitor BSR communications and check the GOV.UK BAC guidance for the latest information.

Understanding your accountable person duties is essential preparation -- the BAC application tests whether you are fulfilling those duties in practice.

#What Your Application Needs: The Document Checklist

When the BSR calls your building in, you have 28 days to submit a complete application. This is not enough time to build a compliance programme from scratch. The application requires evidence that you have been managing building safety effectively on an ongoing basis.

Here is what you need:

#1. Safety Case Report

Your Safety Case Report is the centrepiece of your BAC application. It must demonstrate that you have:

• Identified all structural and fire safety risks in your building
• Assessed the likelihood and severity of each risk
• Documented the measures in place to manage each risk
• Established review cycles for ongoing risk management

The BSR will assess whether your Safety Case Report is thorough, current, and reflects the actual condition of your building. A report prepared 18 months ago and never updated will raise concerns.

For detailed guidance on preparing your Safety Case Report, see the Safety Case Report guide.

For an overview of what a building safety case involves and why it matters, see our guide to building safety cases.

#2. Golden Thread evidence

Your Golden Thread -- the Key Building Information required under section 88 of the Act -- must be accessible, accurate, and current. The BSR will expect to see:

• Structural and architectural drawings
• Fire safety system specifications, inspection reports, and maintenance records
• Fire risk assessment and the status of every action arising from it
• Details of all building work completed since registration
• Version history showing when records were updated

The Golden Thread guide covers the full information requirements.

#3. Residents' engagement strategy

Under section 91 of the Act, you must have a residents' engagement strategy. For your BAC application, the BSR will want evidence that the strategy is not just a document but a functioning process:

• Communications sent to residents about building safety
• Records of complaints received and how they were handled
• Evidence of consultation on safety-related matters
• Response time records

#4. Mandatory occurrence reporting records

Your mandatory occurrence reporting record demonstrates whether you have a functioning system for identifying and reporting safety incidents. The BSR will review:

• All occurrence notices and reports submitted
• Your internal reporting process documentation
• Training records for staff and contractors
• If no occurrences have been reported, evidence that your system is active (training records, escalation procedures, internal audit results)

A building with zero reported occurrences over several years may prompt the BSR to question whether your reporting system is genuinely capturing events.

#5. Fire risk assessment and action tracking

Your current fire risk assessment and a complete record of actions arising from it:

• Who each action is assigned to
• Current status (complete, in progress, overdue)
• Evidence of completion (photographs, contractor certificates, inspection reports)
• Timelines for outstanding actions

A building with 40 fire risk assessment actions where 35 are complete with evidence, 3 are in progress with contractors assigned, and 2 are overdue with documented escalation tells a fundamentally different story than a spreadsheet with no audit trail.

#6. Competence evidence

Evidence that the people managing your building are competent to do so:

• Qualifications and training records for building safety personnel
• Contractor competence assessments
• Evidence of ongoing professional development

#7. Financial records alongside safety documentation

Your BAC application is primarily about safety management, but the BSR may review whether you have adequate financial provision for safety-related works. Having your service charge records, planned maintenance budgets, and reserve fund documentation organised alongside your safety records demonstrates a building that is managed holistically.

See how Brocade helps you prepare for BSR assessment -->

#A Real-World Scenario

You manage a 15-storey residential building with 48 flats. It was registered with the BSR in September 2023. In February 2026, you receive a letter from the BSR informing you that your building has been called in for a Building Assessment Certificate application. You have 28 days.

If you have been managing building safety proactively, this is a documentation exercise, not a crisis:

• Your Safety Case Report was last updated in November 2025 after a fire risk assessment review. You update it to include recent compartmentation survey results from January 2026.
• Your Golden Thread records are held digitally with version history. You export the required information and verify it is current.
• Your residents' engagement strategy has been active for 18 months. You compile communications sent, complaints handled, and consultation records.
• Your mandatory occurrence reporting system has processed two reports in the past year -- one fire door failure and one dry riser test failure. Both were reported to the BSR within the 10-day window, with full occurrence reports submitted subsequently.
• Your fire risk assessment has 32 actions. 28 are complete with evidence, 3 are in progress with contractors, and 1 is overdue by 2 weeks with a documented escalation.

You submit your application on day 21, leaving a week's buffer. The submission is not perfect -- no building's is -- but it demonstrates genuine, structured safety management.

If you have not been managing proactively, 28 days is not enough time. This is why preparation matters.

#Common Reasons for BAC Refusal

The BSR has signalled that rejection rates for BAC applications are significant. Based on BSR communications and published guidance, common reasons include:

• Incomplete or outdated Safety Case Report. Reports that have not been reviewed since initial preparation, or that do not reflect the current condition of the building.
• Gaps in Golden Thread records. Missing fire risk assessment actions, no evidence of maintenance activities, outdated drawings that do not reflect recent building work.
• No evidence of resident engagement. A strategy document that exists but shows no evidence of implementation.
• Missing or inadequate occurrence reporting. No reporting system documented, or no evidence that staff know how to use it.
• Fire risk assessment actions not tracked. Actions identified but not assigned, tracked, or evidenced.

The BSR is not looking for perfection. It is looking for evidence of active, structured safety management. A building with some overdue actions but clear evidence of monitoring, escalation, and progress will fare better than a building with no tracking at all.

#What Happens After the BAC Assessment

#If your application is approved

The BSR issues your Building Assessment Certificate. This is valid for 5 years, after which a reassessment is required. However, reassessment can be triggered earlier by:

• A significant change to the building (major refurbishment, change of use)
• A serious safety incident
• BSR concerns based on new intelligence

Treat the BAC as a living obligation. Continue maintaining your records, updating your Safety Case Report, and operating your compliance systems as normal.

#If your application is refused

If the BSR is not satisfied with your application, you will receive a refusal notice with reasons. The BSR may:

• Issue a compliance notice under section 97 of the Act requiring specific improvements
• Issue a contravention notice under section 99 if there are active breaches
• Require you to reapply after addressing the identified issues

Operating a higher-risk building without a valid BAC means ongoing regulatory scrutiny. The BSR has enforcement powers and is using them.

#Frequently Asked Questions

#What is a Building Assessment Certificate?

A Building Assessment Certificate (BAC) is issued by the Building Safety Regulator under section 79 of the Building Safety Act 2022 when it is satisfied that the principal accountable person is complying with their safety duties for a higher-risk building. The BSR calls buildings in for assessment in priority order, and the principal accountable person has 28 days from the call-in notice to submit their application.

#When will the BSR call my building in for a Building Assessment Certificate?

The BSR began calling buildings in for Building Assessment Certificate applications in April 2024. As of early 2026, priority buildings include those over 30 metres with 11 or more residential units, buildings between 18 and 30 metres with 378 or more units, ACM-clad buildings, and buildings with a large panel system and gas supply. The BSR is expanding to additional buildings over time.

#What documents do I need for a Building Assessment Certificate application?

A Building Assessment Certificate application requires your Safety Case Report, evidence of your Golden Thread records, your residents' engagement strategy, details of mandatory occurrence reports, fire risk assessment and action tracking, and evidence of competent personnel managing building safety. The BSR conducts a substantive review, not a rubber-stamp exercise.

#What happens if my Building Assessment Certificate application is refused?

If the BSR refuses your Building Assessment Certificate application, you will receive reasons for refusal and may need to address the identified issues before reapplying. The BSR can also issue compliance notices under section 97 requiring specific improvements. Operating a higher-risk building without a valid BAC means ongoing regulatory scrutiny and potential enforcement action.

#How often must a Building Assessment Certificate be renewed?

Building Assessment Certificates must be reassessed every 5 years. However, a reassessment can be triggered earlier if there is a significant change to the building, a major safety incident, or the BSR has concerns about ongoing compliance. The principal accountable person should treat the BAC as a living obligation, not a one-off exercise.

#Further Reading

• Mandatory Occurrence Reporting: What Building Managers Must Report and When -- your MOR record is part of the BAC application
• The Building Safety Act 2022: A Complete Guide for Building Managers -- comprehensive overview of all BSA obligations
• Safety Case Report Guide -- step-by-step preparation guidance
• The Complete Golden Thread Guide -- meeting your information management duties
• Accountable Person Duties Under the Building Safety Act -- understanding the duties the BAC tests you against
• Building Safety Act Penalties and Non-Compliance: What You Risk and How to Stay Compliant -- what happens if your BAC application is refused and enforcement escalation
• Fire Door Inspection Requirements: What to Document and How to Evidence Compliance -- fire door documentation as part of your BAC evidence
• GOV.UK: Apply for a Building Assessment Certificate -- official application guidance
• GOV.UK: Preparing a Building Assessment Certificate application -- BSR preparation guidance
• Higher-Risk Buildings: Definition and Criteria -- which buildings require a BAC
• What Is a Building Safety Case? -- the safety case that underpins your BAC
• Accountable Person vs Principal Accountable Person -- understanding who holds which role
• Resident Engagement Strategy -- the engagement evidence the BSR evaluates

This article is for informational purposes. For building-specific advice, consult a qualified fire safety professional.

Stay ahead of compliance deadlines -- get regulatory updates delivered monthly