DESIGNING IN BUSHFIRE PRONE AREAS

In November 2015, Baldwin O'Bryan Architects won the Bushfire Building Council of Australia's  Innovation Award for the best design concept for this design at Newee Creek in NSW.

​CONCRETE COASTAL HOUSES IN BUSFIRE-PRONE AREAS
Designing and building bushfire-resistant homes in Australia’s bushfire-prone coastal regions is no longer optional—it is essential. Recent fire seasons have reinforced this reality, with communities across NSW and Victoria experiencing significant property losses as fires spread rapidly under extreme conditions. These events highlight the importance of resilient design that goes beyond minimum compliance.

At Baldwin O’Bryan Architects, we have evolved from delivering exclusively earth-sheltered homes for bushfire protection to designing more conventional above-ground houses that incorporate a robust, bushfire-resistant concrete shell. We can also offer a design-and-construct delivery model using our own builders, giving clients greater confidence in cost certainty and reducing the risk of significant budget overruns.

We have successfully gained planning and building approvals for over 22 homes in designated Bushfire Prone areas, including many in locations where clients initially thought approval was unlikely. Our team has a comprehensive understanding of town planning and building approval requirements in bushfire zones, including compliance up to BAL–Flame Zone (BAL-FZ). We collaborate closely with highly experienced consultants BAL consultants


WE HAVE DEVELOPED AN INNOVATIVE, COST-EFFECTIVE CONSTRUCTION APPROACH BASED ON EPS CONCRETE PANELS COMBINED WITH A STEEL FRAME SYSTEM.

This method enables us to achieve high bushfire performance without the prohibitive costs often associated with traditional reinforced concrete construction. One of the main challenges in bushfire-resilient design is balancing performance with affordability. While heavy reinforced concrete structures provide excellent fire resistance, they are often costly and slow to erect, making them inaccessible for many homeowners. EPS concrete panel systems, on the other hand, can deliver comparable fire performance at a fraction of the cost and allow for quicker construction. To illustrate, one of our clients received quotes from over six different builders, all of whom estimated building their house above $2.4 million using reinforced concrete. In contrast, the same project was priced at $850,000 when using EPS panels.

EPS concrete panel and steel frame system offers several key advantages:

• Bushfire performance: Engineered EPS concrete panels can deliver up to a four-hour fire resistance rating, enabling compliance up to BAL-FZ conditions.
• Cost efficiency: Compared to solid reinforced concrete, this system significantly reduces construction costs while maintaining comparable fire resistance.
• Thermal performance: The insulating properties of expanded polystyrene combined with concrete provide superior thermal performance compared to dense reinforced concrete, reducing ongoing heating and cooling loads.
• Acoustic benefits: The composite panel system offers enhanced sound insulation, which is particularly beneficial in coastal and bushland environments.
• Design flexibility: Panels can be rendered or finished to replicate off-form concrete with minimal additional cost, allowing architectural flexibility without compromising performance.

By integrating these materials thoughtfully, we can create homes that a bushfire resilient, thermally comfortable, and energy-efficient, with increased durability in bushfire-prone areas.
Having the right professional team is critical. A refusal from authorities such as the CFA in Victoria, the RFS in NSW, or local councils can be extremely difficult to overturn once issued. Early, informed design decisions are essential to avoiding costly delays or refusals.

Architects experienced in bushfire-prone environments provide far more than aesthetic input. This expertise includes:

• Assessing bushfire risk and determining appropriate BAL ratings in accordance with AS3959 and the NCC.
• Translating BAL requirements into buildable, compliant designs that address materials, detailing, openings, roofs and construction systems.
• Managing planning and building approvals, consultant coordination, and regulatory compliance.
• Designing holistic bushfire strategies, including building orientation, defendable space, ember protection, and integrated firefighting infrastructure.

This comprehensive approach is far more effective than isolated measures such as changing cladding or adding shutters late in the process.
Engaging an architect early when building in a bushfire-prone coastal area is ultimately about resilience, safety and certainty. Through informed design, regulatory expertise and innovative construction systems such as EPS concrete panels with steel frames, Baldwin O’Bryan Architects help deliver homes that are durable, cost-effective and better prepared for Australia’s increasingly severe bushfire conditions.
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