BAL ratings and fire notices explained, in plain English

Two different pieces of paper get mixed up constantly. A BAL rating is a building assessment, done once, that sets how your house has to be built. A fire prevention notice is a council maintenance order that comes back year after year. Different authorities, different purpose, different work.

What a BAL rating measures

BAL stands for Bushfire Attack Level. It estimates the radiant heat, in kilowatts per square metre, that a building would face in a bushfire, and it drives the construction requirements under Australian Standard AS 3959. The inputs are the vegetation type around the site, how far the building sits from it, and the slope of the land under that vegetation.

The ratings run BAL-LOW, BAL-12.5, BAL-19, BAL-29, BAL-40 and BAL-FZ, the flame zone. Each step up means tougher construction: better glazing, sealed gaps, non combustible cladding, screened vents. The jump from BAL-29 to BAL-40 or FZ is where build costs really climb.

Why it matters before you build

Vegetation distance is one of the few inputs you can change. Managing vegetation around a proposed dwelling site, to a documented standard, can move a site down a band and take real money off the build. That's exactly why site preparation before a BAL or bushfire management plan assessment is worth doing properly, and why the assessor's report should be in hand before you lock in a builder.

We're not assessors and we don't issue ratings. What we do is the clearing, mulching and fuel reduction work the assessment and any approval conditions call for.

• Bushfire planning, CFA

  CFA guidance on building and planning in a bushfire area, including defendable space and APZ standards.

• Bushfire planning provisions, DTP

  How bushfire management statements and plans are assessed under the Victorian planning system.

• Victorian Building Authority, bushfire construction

  What each BAL rating means for construction requirements under AS 3959.

• Fire Danger Period and restrictions, CFA

  Current Fire Danger Period dates by council area, Total Fire Ban rules and what work is allowed.

• VicEmergency warnings

  Live fire district ratings, warnings and Total Fire Ban declarations.

Fire prevention notices are separate

A fire prevention notice comes from your council under the Country Fire Authority Act, not from a building assessor. It sets a maintenance standard, typically grass cut to a height, a cleared break of a set width around the boundary, and fine fuel away from sheds and fence lines, with a compliance date before the Fire Danger Period.

Miss the date and the council can send its own contractor, do the work to its own standard, and bill you on top of the penalty. Bring the notice to the site visit, it tells us the exact spec and the deadline.

Working through the Fire Danger Period

Once the Fire Danger Period starts in your council area, machinery work is restricted, and on Total Fire Ban days it stops. Blades and rock make sparks. We work off hot ground, start early, carry water and knock off when conditions turn. If the work matters, get it booked before the period starts rather than hoping for a window in January.

Rules, overlays and mapping change. We check the links in this article regularly, but always confirm the current requirements with your council or the relevant Victorian department before you clear anything.

Got a job in mind? Send your address and we'll come out, have a look, and put a written quote together. No obligation.