What Is a Bushfire Prone Area in WA — and Why It Matters Before You Buy

If you're buying in Perth's hills or outer suburbs, there's a good chance your property sits inside a Bushfire Prone Area (BPA). The designation appears on thousands of properties across the metro fringe — from Kalamunda and Mundaring through to Roleystone, Serpentine, and Chittering. But what does it actually mean for you as a buyer?

What Is a Bushfire Prone Area?

A Bushfire Prone Area is a designation assigned by Fire & Emergency Services WA (DFES) based on the surrounding vegetation. Properties within 100 metres of bushland, native vegetation or certain parks may be declared a BPA. The map is updated periodically as land use changes.

Being inside a BPA does not mean your house will burn down. It means additional planning and building controls apply — and that you should be aware of the risk environment.

The Bush Fire Attack Level (BAL)

Once a property is identified as being in a BPA, a specific Bush Fire Attack Level (BAL) is assigned based on the site-specific vegetation and slope. The BAL scale runs from lowest to highest risk:

• BAL–LOW — minimal threat, no specific construction requirements
• BAL–12.5 — ember attack, basic ember-resistant construction
• BAL–19 — increased ember attack and some radiant heat
• BAL–29 — significant radiant heat and ember attack
• BAL–40 — extreme radiant heat
• BAL–FZ (Flame Zone) — direct flame contact possible

Each level above BAL–LOW triggers specific construction requirements under Australian Standard AS 3959-2018 — including things like ember guards on eaves, toughened glass, fire-resistant cladding, and metal mesh screening.

What Does This Cost You?

The construction premium for BPA compliance varies by BAL rating, but rough industry estimates suggest:

• BAL–12.5 to BAL–19: $5,000–$15,000 additional build cost
• BAL–29: $15,000–$30,000 additional
• BAL–40 and above: $30,000–$60,000+ additional

For an existing home, these costs may not apply unless you're planning significant renovation or extension. But they become very relevant if you're buying a block to build, or buying older stock that may need upgrading.

Insurance Implications

Insurers price bushfire risk directly. Properties in higher BAL zones — particularly in the Perth hills — can attract significantly higher home insurance premiums, and in some cases, insurers may decline coverage entirely for properties at BAL–FZ.

Before purchasing, it's worth getting a preliminary insurance quote with the address in hand. An insurance premium that doubles compared to your current policy is a real cost of ownership that often goes uncosted in a buyer's budget.

Bushfire Prone Area vs BAL Rating

It's important to understand that the Bushfire Prone Area designation (shown on PropCheck WA) tells you whether the property is in a designated zone — but it does not tell you the specific BAL rating. The BAL requires a site-specific assessment by a qualified consultant or can sometimes be looked up via your local council's planning portal.

If PropCheck WA shows your property is within a Bushfire Prone Area, the next step is to determine the actual BAL rating before proceeding.

What to Do If Your Property Is in a BPA

1. Check the DFES Bushfire Prone Area map to confirm the designation
2. Obtain a BAL assessment — your local council or a certified consultant can provide this
3. Request a building compliance report if buying an existing home, to confirm any past works met the required standard
4. Get an insurance quote before signing contracts
5. Talk to your conveyancer — some contracts include specific BPA disclosure requirements

Living in a bushfire prone area is common in Perth's hills and outer suburbs, and many homeowners do so safely with proper preparation. The key is going in with eyes open.