Not every project fits neatly within the deemed-to-satisfy (DtS) provisions of the National Construction Code (NCC). Architectural ambition, site constraints and large or complex occupancies often call for an alternative route. Performance solutions provide that route by demonstrating compliance with the Performance Requirements through flexible, evidence-based methods.

What a performance solution can cover

Performance solutions can resolve a wide range of issues, including:

• Fire engineering
  Safe evacuation, smoke control, fire resistance, hydrant coverage or booster arrangements where DtS cannot be met.
• Access consulting
  Equitable and dignified access strategies where geometry or heritage constraints limit prescriptive compliance.
• Other disciplines
  Acoustics, energy, structure and specialist building services where project-specific solutions are warranted.

How compliance is demonstrated

Under the NCC, a performance solution must be assessed using one or more Assessment Methods, for example:

• Verification Methods such as calculations, modelling or testing
  (eg egress modelling, CFD smoke modelling, heat transfer analysis).
• Comparison with DtS to show equal or better performance against a relevant benchmark.
• Expert judgement from appropriately qualified practitioners.
• Evidence of suitability for products and systems used within the solution.

A defensible solution clearly states its acceptance criteria, the assumptions and inputs, the analysis undertaken, and the outcome against the Performance Requirements.

The PBDB process

The Performance-Based Design Brief (PBDB) is the agreed framework for developing a performance solution. It should:

1. Identify the issue
   Define where the DtS pathway falls short.
2. Set objectives and acceptance criteria
   Reference the relevant Performance Requirements and any project-specific goals.
3. Nominate Assessment Methods
   Outline the modelling, calculations, tests or benchmarks to be used.
4. Confirm stakeholders and roles
   Architects, engineers, access consultants, the client and relevant authorities.
5. Record the brief
   Document assumptions, inputs, design fire scenarios (for fire engineering), and deliverables.

Victorian context

Where fire safety is involved, Fire Rescue Victoria (FRV) should be listed as a stakeholder and consulted through the PBDB so that operational considerations are addressed alongside code compliance.

Role of the RBS

The Relevant Building Surveyor (RBS) is not a design stakeholder. The RBS acts as the statutory decision maker who reviews the performance solution and determines compliance against the NCC. Early visibility for the RBS is helpful for program and expectations, but the solution remains the design team’s work product.

Deliverables and documentation

A well-run process produces clear, auditable documents, for example:

• PBDB signed by stakeholders.
• Performance solution report such as a Fire Engineering Report (FER) or Access Performance Solution.
• Input and results files for modelling, with sensitivity checks.
• Drawings and specifications coordinated with the solution.
• Construction phase hold points to verify that the as-built outcome matches the basis of certification.

Consulting building surveyors: independent support

It is not only statutory surveyors who contribute to performance solutions. As independent consulting building surveyors, Krneta works alongside architects, engineers and project managers to:

• Map the compliance pathway and acceptance criteria.
• Coordinate PBDB development and stakeholder engagement, including FRV in Victoria.
• Review alternatives for buildability and regulatory risk.
• Package evidence for a smooth statutory review by the RBS.
• Maintain independence from the RBS role to avoid conflicts.

Why it matters

Performance solutions are not loopholes. They are rigorous, transparent pathways that:

• Preserve design intent where DtS is too restrictive.
• Address site and operational constraints.
• Demonstrate compliance with the Performance Requirements of the NCC.
• Build early consensus among stakeholders and reduce rework during approvals.

How we help

From first principles to final sign-off, Krneta supports project teams to define the problem, agree the criteria, select the right Assessment Methods and document a solution that stands up to scrutiny. If your project is pushing beyond DtS, we can help you chart a clear, defensible path.