CIBSE NSW | NCC – Technical Implications for Building Services Design

The forthcoming National Construction Code 2025 introduces a series of targeted but technically significant refinements to the National Construction Code 2022, with particular impact on building services, façade performance, and compliance pathways.

This seminar will provide a detailed comparison of NCC 2025 against NCC 2022, focusing on areas where technical interpretation, modelling, and coordination requirements are evolving. Key themes include:

• Carpark Ventilation and Smoke Hazard Management – alignment with updated AS 1668.2 provisions, including revised trigger points, system configuration requirements, and tenability considerations.
• Condensation Management – expansion and clarification of hygrothermal performance requirements, including increased reliance on transient modelling (e.g. WUFI) to demonstrate compliance for complex façades.
• Water Ingress and Envelope Durability – tighter integration between NCC provisions and façade detailing, with greater accountability for interface coordination between disciplines.
• Energy Efficiency and Electrification – incremental tightening of commercial energy provisions and increased focus on whole-of-building performance, including services loads and system efficiencies.

The session will unpack how these changes influence system selection, plant sizing, façade specification, and the development of Performance Solutions, with a focus on reducing design risk and improving compliance certainty.

This seminar is aimed at engineers and design professionals seeking a detailed, technically grounded understanding of NCC 2025. Attendees will gain practical insight into how the code changes affect modelling assumptions, documentation requirements, and interdisciplinary coordination to enable more robust, compliant, and efficient building designs.

Who are our Speakers?

Brett Fairweather – Mechanical Engineer & Co-author of AS 1668.2-2024
Brett will present a deep dive into the technical updates within AS 1668.2-2024 and their interaction with NCC 2025. The session will cover:

• Revised methodologies for carpark ventilation design, including contaminant-based and performance-based approaches
• Smoke hazard management systems, including tenability criteria, jet fan layouts, and integration with fire engineering strategies
• Implications for system testing, commissioning, and verification under a Performance Solution framework

Facade Engineer (TBC)
The façade session will focus on the increasing technical rigour required to demonstrate compliance with NCC 2025, including:

• Condensation risk analysis, including dew point control, interstitial condensation, and the role of vapour permeance in multi-layered façade systems
• Application of hygrothermal modelling to justify non-DtS façade build-ups
• Water ingress management, including pressure equalisation, drainage strategies, and interface detailing with structure and services
• Coordination challenges between façade, mechanical, and structural systems

ESD Engineer (TBC)
The ESD perspective will explore the technical trajectory of NCC energy provisions, including:

• Changes to JV3 modelling requirements and the increasing importance of accurate services inputs (e.g. HVAC system efficiencies, controls, and zoning)
• Implications of electrification and reduced reliance on gas, including impacts on plant configuration and infrastructure capacity
• Interaction between building fabric performance and services design, particularly in reducing peak loads and operational energy
• Strategies for aligning NCC compliance with broader sustainability frameworks (e.g. NABERS, Green Star)

CIBSE ANZ events are proudly supported by Seber Recruitment Group — Australia’s specialist recruitment partner to the design engineering sector.

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CIBSE Australia and New Zealand provides members and the greater building industry with progressive leadership and knowledge. The institution promotes competence that forges new standards of excellence in design, science and engineering of the built environment.

Our vision is to be the predominant Professional Association for building services engineers in the ANZ region.

www.cibse.org.au

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