15/09/2025
š„ What is a BAL Rating ā and why does it matter?
A Bushfire Attack Level (BAL) rating is an essential step in understanding how vulnerable your home or building project is to bushfire threats.
A BAL assessment measures exposure to the three main bushfire impacts:
> Ember attack
> Radiant heat
> Direct flame contact
Using the method set out in AS 3959, a BAL rating is assigned based on vegetation, slope, and distance from the risk. The result? A clear indication of the potential radiant heat your property could face ā measured in kilowatts per square metre (kW/m²).
BAL ratings range from BALāLow (low risk) to BALāFZ (Flame Zone) (extreme risk).
For instance, BALā12.5 means your home may experience up to 12.5 kW/m² of radiant heat. Knowing your BAL rating early helps guide construction choices ā and ensures compliance while reducing the chance of loss during a bushfire event.
ā”ļø Pro tip: Donāt wait until later stages of your project to assess your BAL ā it can affect your design, materials, and even project feasibility.
Need help interpreting your BAL or navigating construction requirements? We're here to assist contact us on (08) 9555 9444.