Performance-Based Fire Engineering Solutions Under the NCC

What This Requirement Covers

Performance-based fire engineering solutions under the National Construction Code (NCC) provide an alternative to the prescriptive Deemed-to-Satisfy provisions. Rather than following fixed, prescriptive measures, a Performance Solution demonstrates by analysis, modelling, expert judgement and/or evidence of suitability that the building design meets the NCC Performance Requirements for life safety, property protection and the safety of emergency personnel. These solutions exist because complex or innovative buildings, alternative materials, site constraints or mixed uses can make the Deemed-to-Satisfy pathway impractical or overly restrictive. They are used by designers, fire engineers, certifiers, authorities having jurisdiction and building owners where a tailored fire safety outcome is required.

Performance Solutions apply to any building work where the proponent chooses not to, or cannot, fully meet the Deemed-to-Satisfy provisions. This includes new buildings, alterations, extensions and changes of use for all building classes (Class 1 to Class 9) and for plumbing and drainage where relevant. The NCC requires that a Performance Solution be demonstrated against the relevant Performance Requirements in the applicable NCC Volume and verified using the recognised assessment methods and verification methods set out in the NCC.

Key Requirements

1. Performance Requirements: All Performance Solutions must demonstrate compliance with the relevant Performance Requirements in the NCC Volume applicable to the building class in question - for fire safety these are primarily in Parts B (Fire Safety) and C (Fire Resistance) of NCC Volume One and the equivalent Parts in NCC Volume Two when relevant. Cite the applicable Performance Requirements and show equivalence to the Deemed-to-Satisfy outcome as required by the NCC (see NCC Volume One, A2G4 and related sections).
2. Verification Methods: Performance Solutions must be verified using one or a combination of the NCC-accepted Assessment Methods: Deemed-to-Satisfy Comparison, Expert Judgement, Evidence of Suitability, and Fire Safety Verification Method - Fire Engineering (where full fire engineering analysis is required). Refer to NCC Volume One - Verification Methods and A2G4 for the governing methodology.
3. Performance-Based Design Brief (PBDB): A documented PBDB is mandatory when using the Fire Safety Verification Method. The PBDB must involve relevant stakeholders, set the design basis and fire strategy, address evacuation strategy and management regimes, and identify the scope of analyses and modelling to be undertaken (NCC Volume One, Fire Safety Verification Method - see clause references on PBDB requirements, e.g., NCC Volume One, C1V4 and related text).
4. Final Report Requirements: The fire safety engineer must produce a final report that includes the agreed PBDB, all modelling and analysis, demonstration of equivalence to the Deemed-to-Satisfy Provisions, and any other information required by the Fire Safety Verification Method Standard (NCC Volume One - Fire Safety Verification Method clauses such as C1V4 and associated guidance).
5. Quantitative and Qualitative Criteria: Performance Solutions frequently require quantitative metrics. Examples include:
6. Evacuation times modelled to demonstrate occupant safety under the proposed strategy, with outputs expressed in seconds or minutes and compared to Deemed-to-Satisfy assumptions.
7. Smoke layer heights and tenability criteria expressed in metres and accepted temperature or visibility thresholds in accordance with the modelling standard used.
8. Fire growth and heat release rates given in kW and modelled heat fluxes in kW/m2 to assess structural or occupant risk.
9. Structural fire resistance and loadbearing capacity shown as required FRLs in minutes (for example 60/60/60 expressed in minutes where applicable) where equivalence to NCC tables is needed.
10. Standards and Guidance: Use of recognised Australian Standards and guidance documents is required or highly recommended where applicable, for example AS 3959 for bushfire-prone areas when relevant to fire engineering, AS/NZS 1668.1/1668.2 for smoke control and ventilation design, relevant sections of the Australian Fire Engineering Guidelines, and any specialist standards for modelling tools. Always cite the NCC clauses alongside any Australian Standard used in the analysis.
11. Peer Review and Stakeholder Involvement: The PBDB must consider whether an independent peer review is required; where risk is high or the solution departs significantly from Deemed-to-Satisfy outcomes, peer review by an independent fire safety engineer is commonly required (NCC Volume One - Fire Safety Verification Method clauses such as C1V4(2)(d)).
12. Documentation and Traceability: All assumptions, inputs, model versions, occupant loads, egress strategies and management arrangements must be documented, with the final report forming part of the documentation for approval by the appropriate authority (NCC Volume One, A2G4 and Fire Safety Verification Method clauses).

Residential vs Commercial

1. Residential (Class 1 and 10): Performance Solutions are less commonly used for straightforward single-dwelling Class 1 or non-habitable Class 10 work because Deemed-to-Satisfy provisions in NCC Volume Two are typically sufficient and prescriptive requirements are simple to follow. When a Performance Solution is used for residential work it commonly addresses specific issues such as bushfire attack (AS 3959 interactions), alternative escape arrangements for multi-dwelling layouts, or innovative materials. The PBDB, modelling of occupant evacuation (often simplified), and demonstration of equivalence to NCC Volume Two Performance Requirements are still required.
2. Commercial and other non-residential (Class 2-9): Performance Solutions are far more common. Complex egress strategies, atria, large open-plan spaces, shopping centres, high-rise offices, hospitals and assembly occupancies routinely require fire engineering analysis covering evacuation models, smoke control systems, fire growth and spread modelling, and structural fire protection. The NCC Volume One Fire Safety Verification Method and Fire Safety Verification Method Standard are the primary pathways. Outputs must compare to Deemed-to-Satisfy assumptions for occupant densities, evacuation times, travel distances in metres, smoke management performance, and FRL equivalence in minutes where structural elements are considered.

Exceptions and Exemptions

1. Performance Requirement Only Items: Some NCC Performance Requirements have no Deemed-to-Satisfy Provisions and must be satisfied by a Performance Solution. In those cases, the Performance Solution is mandatory for compliance (see NCC Volume One where noted).
2. Minor Variations: For small or low-risk departures from Deemed-to-Satisfy provisions, expert judgement or evidence of suitability may be adequate instead of a full fire engineering analysis. The selection of an appropriate verification method must be justified in the PBDB.
3. Alternative Solutions and Equivalence: Where a Performance Solution demonstrates an outcome at least equivalent to Deemed-to-Satisfy safety outcomes, it is an accepted alternative. This equivalence must be demonstrable by quantitative analysis or explicit comparison (NCC Volume One, A2G4).
4. Authority Discretion: Appropriate authorities (local certifiers, fire authorities) may impose additional conditions, require amendments or reject Performance Solutions where they do not adequately demonstrate equivalence. Some state legislation may limit the role of the appropriate authority in the PBDB process; where that occurs dissenting views must be recorded (NCC Volume One, C1V4(2)(c)).

State and Territory Variations

1. State Schedules: The NCC is national, but each state and territory can include schedules that modify national provisions. Users must check the relevant state schedule in NCC Volume One (Schedules 4-12) for any jurisdiction-specific variations that may affect Performance Solutions, documentation requirements, or the involvement of state fire services. For example:
2. Queensland: Has specific provisions in Schedule 7 that may affect documentation or approvals for some building types. Verify state schedule text in NCC Volume One, Schedule 7.
3. New South Wales, Victoria, Western Australia, South Australia, Tasmania, ACT, Northern Territory: Each jurisdiction may have amendments or additional requirements for fire safety approvals, the role of the fire brigade, or the acceptance of modelling tools; always consult the state schedules and local requirements.
4. Bushfire-Prone Areas: State mapping and bushfire overlay provisions interact with AS 3959 and local planning regulations. These vary by state and must be checked separately in each jurisdiction.

Practical Compliance Tips

1. Prepare a clear PBDB early - involve the client, architect, certifier, fire authority and the fire engineer from the concept stage so scope, assumptions and stakeholder expectations are agreed and recorded (NCC Volume One, Fire Safety Verification Method - PBDB clauses).
2. Choose the right verification method - match the complexity of the proposal to the assessment method. Use expert judgement or evidence of suitability for minor departures; use full fire engineering analysis for complex or high-risk solutions (NCC Volume One, A2G4).
3. Document all assumptions and inputs - include occupant densities, evacuation behaviour, fire load, material properties, model software and versions, and management strategies in the final report to avoid ambiguity during approval.
4. Model defensibly - use validated fire models, select appropriate heat release rates in kW, smoke criteria, and tenability thresholds, and show sensitivity analysis so the authority can see how robust the solution is.
5. Compare to Deemed-to-Satisfy outcomes - present clear side-by-side comparisons (travel distances in metres, evacuation times in seconds/minutes, FRL equivalence in minutes) to demonstrate at least equivalent safety (NCC Volume One, A2G4).
6. Allow for peer review - for novel solutions or high-consequence outcomes, budget time and fees for independent peer review; many authorities request or require it (NCC Volume One, C1V4(2)(d)).
7. Check state schedules and local requirements early - confirm any jurisdictional variations in the NCC state schedules and local fire authority practices to avoid late redesigns or delays.

References (key documents to cite in approvals)

1. NCC 2022 Volume One - Building Code of Australia: Fire Safety Verification Method clauses including A2G4 and Fire Safety Verification Method text (PBDB and final report requirements).
2. NCC 2022 Volume Two where relevant for residential matters and Deemed-to-Satisfy comparisons (see Section references such as NCC Volume Two, Section 6.3.5 when applicable).
3. Australian Fire Engineering Guidelines and relevant Australian Standards such as AS/NZS 1668.1, AS/NZS 1668.2, AS 3959 where applicable.

Note: State schedules in NCC Volume One (Schedules 4-12) may modify these requirements. Always verify the final Performance Solution and required documentation with the appropriate state or territory schedule and the local authority having jurisdiction before seeking final approval.