What Is the NCC and How Does It Affect My Project?
The National Construction Code (NCC) is Australia's primary technical regulation for the design, construction, and performance of buildings. Administered by the Australian Building Codes Board (ABCB), it applies to all new construction, alterations, additions, and changes of use — regardless of project value or size. Every building permit in Australia is assessed against NCC compliance.
Structure of the NCC
The NCC is organised into three volumes:
- Volume One: Class 2–9 buildings (apartments, commercial, industrial, public buildings)
- Volume Two: Class 1 and 10 buildings (houses, townhouses, garages, fences, pools)
- Volume Three: Plumbing and drainage (applies across all building classes)
For residential house projects, Volume Two is the relevant document. It establishes minimum requirements across six primary concern areas.
What the NCC Covers
Structure: Buildings must be capable of withstanding the loads and forces they will be subjected to — dead loads, live loads, wind, seismic, and snow loads where applicable. Compliance with relevant Australian Standards (AS1170 series for structural loads, AS3600 for concrete, AS4100 for steel, AS1720 for timber) is the primary pathway to satisfying structural requirements.
Fire safety: Class 1 buildings must meet requirements for fire separation from other buildings, smoke alarms, and egress. Class 1a (single dwellings) requirements are relatively straightforward. Class 1b (boarding houses, bed-and-breakfast with more than 4 bedrooms) attract additional requirements.
Health and amenity: Requirements covering light and ventilation in habitable rooms, wet area waterproofing, glazing safety, and sanitary facilities. These are minimum standards — many clients and architects choose to significantly exceed them for liveability.
Energy efficiency (NatHERS): This is the NCC area that has seen the most significant recent change. The NCC 2022 increased minimum energy efficiency requirements for Class 1 buildings from 6 to 7 stars under the Nationwide House Energy Rating Scheme (NatHERS). A NatHERS assessment is required for new dwellings and significant additions. The assessment considers insulation levels, glazing performance, orientation, shading, and air tightness.
Access and mobility: The NCC includes requirements for step-free access at the entrance in some circumstances, and the 2022 edition introduced Livable Housing Design provisions — accessible housing features aimed at allowing people to remain in their homes as their mobility changes over time. The Livable Housing Design requirements apply to new Class 1a dwellings in most states from 1 May 2023.
Site preparation: Requirements for termite management, sub-floor ventilation, and drainage.
How the NCC Interacts with Australian Standards
The NCC frequently references Australian Standards as the compliance pathway for specific requirements. For example, AS3959 (Construction of Buildings in Bushfire-Prone Areas), AS1851 (fire protection system maintenance), and AS4671 (steel reinforcing materials) are all referenced in the NCC. Compliance with the referenced standard is typically taken as compliance with the relevant NCC requirement.
Who Enforces the NCC?
The Registered Building Surveyor (RBS) appointed to issue your building permit is responsible for assessing NCC compliance before issuing the permit. The RBS may engage specialist consultants (structural, fire, hydraulic) to assess specific elements. The NCC is enforced at design stage (permit assessment) and at construction stage (mandatory inspections).
What the NCC Means for Your Project
The NCC sets minimum standards. An architect's role is to design a building that meets those minimums — but the best residential design significantly exceeds them. Minimum NatHERS compliance does not equal a comfortable, low-energy home. Minimum structural compliance does not guarantee a building that performs well over 50 years. The NCC is the floor, not the ceiling.
Where your project is in a bushfire-prone area (BMO), your architect will commission a BAL (Bushfire Attack Level) assessment. The BAL rating drives specific construction requirements under AS3959 — from BAL-12.5 (low risk, minor measures) through to BAL-FZ (flame zone, most restrictive construction requirements).
NCC 2022 Key Changes
These came in with NCC 2022. Victoria has applied NCC 2025 since 1 May 2026, so check each one against it with your building surveyor.
The NCC 2022 (adopted in most states from May 2023) introduced:
- Increase from 6 to 7 stars NatHERS minimum for Class 1 buildings
- New whole-of-home energy budget including appliances and fixed lighting
- Livable Housing Design requirements (accessible features) for new Class 1a dwellings
- Updated bushfire construction provisions