What are the mandatory bushfire attack level (BAL) requirements for new residential builds in fire-prone areas of Victoria?

In Victoria, new residential builds in designated bushfire-prone areas must comply with mandatory Bushfire Attack Level (BAL) requirements under the Building Code of Australia (BCA), part of the National Construction Code (NCC). A BAL assessment determines the dwelling's exposure to ember attack, radiant heat, and direct flame contact, ranging from BAL-Low (no special construction required) to BAL-40 and BAL-FZ (Flame Zone), requiring increasingly stringent construction methods and materials. These requirements ensure appropriate fire resistance for roofs, walls, windows, doors, and sub-floor areas, utilising materials like fire-resistant timber, steel, or masonry, to minimise risk and enhance occupant safety.