Core Technical Updates in NCC 2025: What Victorian Building Projects Need to Know

The National Construction Code (NCC) shapes decisions about building structure, fire protection, water management, ventilation and energy performance. When its technical requirements change, project teams need to understand how those changes affect their designs, specifications and approval pathways.

Victoria adopted NCC 2025 on 1 May 2026. The edition introduces important updates across commercial, apartment, residential and plumbing work, with the applicable requirements depending on the building classification and project circumstances.

For architects, builders, developers and education providers, the practical priority is to identify relevant changes early and coordinate them across the design team.

1. A More Integrated Approach to Water Management

NCC 2025 strengthens water management requirements for commercial and apartment buildings, addressing water ingress through both exposed surfaces and sub-surface conditions.

Volume One consolidates roof and wall cladding provisions into Part F1. It also introduces more explicit requirements for drainage, falls and substrates on surfaces such as balconies, podiums and concrete roofs. Structural design must account for ten-year substrate deflection to help maintain the required falls.

What this means for your project: waterproofing should be coordinated with structural and drainage design from the beginning.

For example, a balcony detail needs to resolve the relationship between the structural slab, membrane, finished surface and drainage outlet. Reviewing these elements together helps identify conflicts while the design can still be adjusted.

2. Stronger Car Park Fire Safety

NCC 2025 tightens fire safety provisions for car parks, including sprinkler protection for open-deck car parks within other buildings and restrictions on when reduced fire-resistance concessions can be used.

The edition also strengthens testing requirements for external wall classification and specified fire hazard properties, requiring testing by an Accredited Testing Laboratory.

What this means for your project: establish the fire protection strategy before finalising car park layouts, structural systems and services.

For material selection, review the supporting test evidence against the proposed use. A product’s marketing description alone should not form the basis of a compliance decision.

3. Updated Commercial Energy Efficiency Requirements

Commercial energy efficiency updates include stronger building envelope provisions, improved lighting controls and requirements for on-site solar photovoltaic systems where applicable.

An important distinction concerns apartments: Class 2 buildings continue to use the NCC 2022 Amendment 2 Section J provisions, rather than the new NCC 2025 commercial Section J requirements.

What this means for your project: energy compliance needs to be assessed against the correct building classification.

For an office, school or other relevant commercial development, review glazing, insulation, lighting, mechanical services and renewable energy requirements together. Early coordination helps establish realistic allowances for plant, roof space and building services.

For mixed-use developments, confirm how the requirements apply to each classified part.

4. Improved Condensation Management

NCC 2025 updates residential condensation provisions to improve ventilation and moisture management, responding to health risks associated with condensation and mould.

What this means for your project: wall and roof assemblies should be reviewed as complete systems.

A practical review should consider the proposed cladding, insulation, membranes, ventilation arrangements and construction details. It should also check whether product substitutions change the assumptions behind the original design.

For Victorian projects, ask the design team to explain how the selected assembly manages moisture under the relevant climate conditions. Clear specifications make that intent easier to carry through to construction.

5. More Explicit Structural Reliability Requirements

NCC 2025 introduces minimum structural reliability indices and a more quantitative approach to demonstrating structural performance.

Victoria also introduces specific limitations for Performance Solutions addressing B1P1(2) and H1P1(2). These require equivalence to the Deemed-to-Satisfy provisions and assessment through comparison with those provisions. The Victorian limitations commence on 1 May 2027.

What this means for your project: agree on the structural compliance pathway early, particularly where the proposal uses an unconventional design or construction system.

The structural engineer, architect and building surveyor should establish the necessary assessment methods, evidence and documentation before detailed design progresses.

6. Changes to Wayfinding and Sanitary Facilities

NCC 2025 introduces a wayfinding Performance Requirement and associated provisions for identifying stairways, floor levels and sole-occupancy units. These support evacuation and emergency services intervention.

The edition also provides an optional pathway for all-gender sanitary facilities in public buildings, subject to the relevant requirements.

What this means for your project: include signage and sanitary layouts in the compliance review during design.

For schools, public facilities and larger developments, coordinate these elements with accessibility, circulation and operational requirements. Early decisions help avoid changes to room layouts or signage packages late in the project.

7. Plumbing Updates and Lead-Free Products

NCC 2025 Volume Three includes changes covering drinking water services, cross-connection control, sanitary plumbing and drainage, and combined sprinkler and hydrant systems.

In Victoria, relevant copper alloy products contacting drinking water must be WaterMark certified and carry the Lead Free WaterMark logo. The requirements apply to relevant plumbing work commencing on or after 1 May 2026. Updated provisions also address above-ground pipework materials in combined sprinkler and hydrant systems.

What this means for your project: check product schedules and certification before procurement.

A coordinated review between hydraulic and fire services consultants can help identify material requirements, system interfaces and supporting evidence before installation begins.

Turning Technical Updates into Clear Project Actions

A useful NCC review should translate each relevant change into an action, a responsible person and a document that demonstrates compliance.

Before finalising your design:

• Confirm the applicable NCC edition and any project-specific transition arrangements.

• Check building classifications, including separately classified parts of mixed-use developments.

• Review Victorian variations alongside the national provisions.

• Coordinate affected disciplines, particularly structure, waterproofing, fire protection and building services.

• Update specifications and product evidence to reflect the agreed design.

• Resolve outstanding compliance questions before tendering or procurement.

An existing specification or standard detail should be checked before it is carried into a new project. That review provides an opportunity to identify outdated references and clarify responsibilities.

Navigate NCC 2025 with Part 6 Building Surveyors

Part 6 Building Surveyors provides NCC advisory services, compliance reporting and performance and compliance consulting across Melbourne and Victoria. We support commercial and education-sector clients in understanding the requirements relevant to their projects.

Whether you are preparing a new development or reviewing proposed building works, early advice can help turn technical requirements into a clear approval strategy.

Build compliance into your design from the start. Contact Part 6 Building Surveyors to discuss how NCC 2025 affects your project.