Commissioning and interpreting a Bushfire Attack Level assessment

BAL assessments must be conducted by an accredited assessor. The mainstream accreditation body in Australia is the Fire Protection Association Australia (FPA Australia) Bushfire Planning and Design (BPAD) certification.

Ask any prospective assessor for their FPA Australia certification number and confirm it on the FPA Australia website. Accreditation lapses if not maintained; check the current status.

Some council-appointed bushfire assessors and independent consultants offer this service. Independent consultants often provide more detailed advisory beyond the pure assessment; council assessors typically produce the minimum required certificate.

For BAL-40 and BAL-FZ classifications, engage an assessor with specific experience at those levels; the assessment complexity is higher and the design implications are significant.

Timing of the BAL assessment matters. Too early and vegetation may have changed by the time of the build. Too late and the design work has been done without knowing the applicable BAL level.

The sweet spot is at concept design stage, before working drawings begin. This lets the designer factor the BAL requirements into the design from the start.

For a property being considered for purchase, a pre-purchase BAL assessment is a small investment relative to the property purchase decision. A BAL-FZ property may not be a suitable purchase for owners not prepared for the specialist build.

For a property being considered for a substantial extension, a fresh BAL assessment is required. Older assessments do not carry over.

The BAL assessment produces a written report and a BAL certificate. The certificate identifies the assessed BAL level and the factors that led to it.

Read the report carefully. It should identify: the vegetation classifications around the property and the distances measured; the slope of the land between vegetation and the proposed building; the Fire Danger Index applicable to the area; and the calculated BAL level.

Understand what could change the BAL. If vegetation is on your property and could be cleared, the BAL could reduce. If vegetation is on protected adjoining land, the BAL is essentially fixed.

Some assessors provide "what-if" analysis showing how BAL would change with different vegetation management scenarios. This is a useful input to the design decision.

BAL assessments can vary between assessors on the same site because vegetation classification involves some professional judgement.

If a BAL assessment produces a result that seems high (or low) for the property, consider commissioning a second assessment from a different accredited assessor. Fees for a second opinion are modest relative to the cost of building to an incorrect BAL level.

Genuine disagreements about vegetation classification can be resolved by discussion between assessors, referral to a specialist vegetation ecologist, or by choosing the more conservative assessment.

Council may also apply their own assessment overlay in some cases. Where council BAL differs from your assessor BAL, the council decision typically prevails at planning consent, though it can be appealed with sufficient evidence.

A BAL assessment is a snapshot of conditions at the assessment date. Changes in vegetation (either growth or clearance, on your property or adjoining) can change the applicable BAL.

If significant vegetation changes occur between assessment and completion, a fresh assessment may be required. Bushfire seasons, natural events, or planned clearance can all trigger this.

Keep the original assessment certificate as part of your property documentation. It provides evidence of the BAL at build time and is often requested by insurers and future buyers.

For homes intended for long-term ownership, a periodic bushfire property review (perhaps every 5 to 10 years) surfaces changes in the surrounding fuel load and any implications for the home. Both council and CFS offer this type of review in many areas.