BAL Rating
By George Giannakakis · B.Arch.Studies · M.Arch (UniSA) · RLA300580
Last reviewed: · How we research
BAL Rating explained in detail
Bushfire Attack Level-a measure of a building's potential exposure to ember attack, radiant heat, and direct flame contact during a bushfire. Ratings range from BAL-LOW (lowest risk) through BAL-12.5, BAL-19, BAL-29, BAL-40, to BAL-FMZ (Flame Zone-highest risk). Higher ratings require more expensive construction methods and materials to meet Australian Standard AS 3959.
In this episode we explain what Bushfire Attack Level or “BAL” means. Tune in as we cover the different BAL ratings, how to find if your block is in a BAL zone, what the rough costs are and what you get for those costs as a result.
Watch full episodeRelated Terms
Frequently Asked Questions
Common questions about bal rating
Building costs increase with BAL rating: BAL-12.5 adds around $5,000-$10,000, BAL-19 and BAL-29 add $15,000-$30,000, and BAL-40 can add $40,000-$80,000+ due to requirements for ember-proofing, special glazing, non-combustible materials, and bushfire shutters. BAL-FMZ may make residential construction impractical.
Cost figures are indicative onlyUpdated February 2026
All prices and cost ranges mentioned are approximate, based on Adelaide market conditions at time of writing, and may not reflect current pricing. Actual costs depend on your specific site, design, builder, materials, and market conditions. Project-specific quotes from qualified professionals are needed for accurate pricing.
Verify against the binding rules in your state
BuildPilot is an independent Australian building platform, we publish guidance, we don't hold a building licence. Every Australian residential build must comply with the National Construction Code plus state-specific Acts and consumer-protection law. The authorities below are the primary sources of truth for the rules that actually apply to your project.
National
The primary national set of technical building standards that every Australian build must comply with. Volume 2 covers Class 1 & 10 buildings (most homes).
Specific material, product and method standards (e.g. AS 3700 masonry, AS 1684 timber framing) referenced by the NCC.
National peak body for residential builders. Publishes the most widely used home-building contracts and consumer guidance.
National peak body for general builders. Publishes commercial and residential contracts and industry guidance.
By state & territory
Links above open the public website of each authority. BuildPilot is not affiliated with these bodies and does not act on their behalf. Information on this page is general - check the current edition of the NCC and the relevant state Act for binding requirements.
We use cookies to improve your experience. Cookies on. Learn more