Houses in Australia are classified as Class 1a under the NCC and are governed by Volume Two - the Housing Provisions. Volume Two has fundamentally different facade requirements to Volume One, which covers multi-storey buildings (Class 2 through 9). The most important difference: Volume Two does not generally require external walls to be non-combustible. There is no Type A or Type B construction requirement for houses.
If you are specifying, building, or renovating a house, the facade requirements are primarily about weatherproofing and structural adequacy - not fire classification of wall materials. But there are specific situations where non-combustible cladding does apply, and they come up more often than people expect.
What does Volume Two actually require for external walls?
The primary facade requirement under Volume Two is weatherproofing. Part 7.5 requires external walls to prevent water penetration that could cause unhealthy conditions, loss of amenity, or damage to building elements. Structural adequacy under wind loads (referencing AS 1170) is also required.
Unlike Volume One, there is no table assigning construction types to houses and no blanket requirement that external wall materials pass AS 1530.1 non-combustibility testing. A house can be clad in timber, fibre cement, render, metal, or aluminium - the code does not mandate a particular material class for fire performance in most situations.
When does non-combustible cladding apply to houses?
Three situations bring non-combustible requirements into play for residential houses.
Bushfire zones
This is the most common trigger. If a house is on a site designated as bushfire-prone, AS 3959 applies. The Bushfire Attack Level (BAL) rating for the site determines the construction requirements, and at higher ratings - particularly BAL-29, BAL-40, and BAL-FZ - external walls must use non-combustible materials.
Many residential sites fall within bushfire-prone zones. This is not limited to rural properties - urban fringe areas, regional towns, and coastal sites adjacent to bushland are routinely BAL-rated. Bushfire mapping has expanded significantly over the past decade, and new housing estates on the urban periphery are increasingly captured.
For houses rated BAL-29 and above, non-combustible aluminium cladding is a straightforward compliance path. The material satisfies AS 3959’s external wall requirements without needing a Performance Solution or complex fire engineering assessment.
Proximity to boundaries
NCC Volume Two Part 3.7.1 addresses fire separation for houses close to side and rear boundaries. External walls within certain distances must have specific fire resistance to protect against fire spread between buildings. Non-combustible materials are the simplest way to meet these requirements - particularly for walls within 900mm of a boundary.
This comes up on smaller residential lots, duplex sites, and subdivisions where setbacks are tight. The requirement is about protecting neighbouring properties, not about the building’s own classification.
Choice and preference
Beyond code requirements, many homeowners and architects choose non-combustible cladding for houses for practical reasons that have nothing to do with compliance triggers.
Durability is the most common driver. Aluminium does not rot, does not attract termites, does not crack like render, and does not need repainting every 7 to 10 years. In coastal environments, PVDF and powder coat finishes resist salt air degradation far longer than painted timber or fibre cement.
Insurance is another factor. Some insurers offer better terms for houses clad in non-combustible materials, particularly in bushfire-prone areas. And aluminium gives architects more design freedom than most residential cladding options, with less long-term maintenance.
How do aluminium facade systems work on houses?
Valmond & Gibson’s interloQ interlocking rainscreen system is increasingly used on residential houses - from contemporary coastal builds to multi-level homes. The interlocking aluminium extrusions create a continuous, ventilated facade with no exposed fixings. Vertical or horizontal installation, a full colour range including woodgrain finishes, and individual panel replaceability give architects genuine design flexibility. Typical residential interloQ projects run between $20,000 and $50,000 in material value.
element13 solid aluminium panels suit residential applications where large, flat surfaces are the design intent - feature walls, entries, garage frontages, and upper-level accents. The 3mm solid panel with PVDF finish and large format (up to 1500mm x 4000mm) creates a premium, clean look with fewer joints than smaller-module cladding.
Why are more houses moving to aluminium?
The residential market for aluminium cladding is growing because the alternatives carry trade-offs homeowners are increasingly unwilling to accept. Timber needs regular painting and is susceptible to rot, termites, and bushfire. Fibre cement cracks at joints and needs periodic repainting. Render cracks and stains, particularly on lightweight framed walls.
Aluminium does not rot, crack, or need repainting. It carries a 20-year warranty when installed by a qualified installer, and it is 100% recyclable at end of life. For a homeowner thinking 20 to 30 years ahead, the total cost of ownership compares well against materials that need cyclical maintenance.
The bottom line for residential projects
Houses do not carry the compliance complexity of multi-storey buildings. Volume Two’s facade requirements are primarily about keeping water out and keeping the structure standing. But houses in bushfire zones, on tight lots near boundaries, or where the owner wants a better-performing facade - that is where non-combustible aluminium cladding makes practical sense.
V&G supplies interloQ and element13 for residential projects across Australia. If you are working on a house and want to understand product options, pricing, or how the material works for your design, get in touch with our team.
Related Reading
- Aluminium Cladding in Bushfire Zones
- NCC Facade Requirements by Building Class
- How Long Does Aluminium Cladding Last?
- Rainscreen vs Direct-Fix Cladding
Last updated: 4 April 2026