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Black summer study: 94% of NSW homes lost were within 100m of vegetation

New research confirms official risk maps but warns worsening fire conditions may require larger buffer zones

By LineZotpaper
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Almost every home destroyed in New South Wales during the 2019-20 Black Summer bushfires was within 100 metres of flammable vegetation, new research has found, validating the buffer zone used by authorities but raising concerns that climate change will push fires further into suburban areas.

A study published in the International Journal of Wildland Fire examined the 2,475 homes lost in NSW during the catastrophic Black Summer fire season, which killed 33 people and destroyed more than 3,000 homes nationally. Researchers found that 94% of those homes were within 100 metres of trees or other flammable vegetation.

That distance is the key threshold used by the NSW Rural Fire Service (RFS) to map bushfire-prone land and inform planning decisions. Associate professor Owen Price of the University of Wollongong, who led the research, said the finding showed the approach was "more or less spot on".

However, the study also found that on days when the Forest Fire Danger Index reached extreme or catastrophic levels, homes beyond the 100-metre buffer were burning. "That's a warning sign, because we know that index is going to get worse," Price said, referring to the effects of global heating.

The NSW RFS said the findings reinforced the need for homes in high-risk areas to be built to higher fire standards, as the state prepares for what it described as a potentially challenging fire season.

Price noted that wildfire researchers are increasingly alarmed by urban fires globally, including the 2025 Eaton fire in Los Angeles that killed 19 people and destroyed thousands of structures. Part of his work is examining whether similar events could occur in Australia.

The study is an endorsement of current risk mapping, but the authors warn that recommended distances between homes and vegetation may need to increase as fire conditions worsen under climate change.

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Analysis

Why This Matters

  • The research validates the 100-metre buffer zone used for planning and fire preparation, giving authorities confidence in existing risk maps.
  • The warning about homes burning beyond the buffer under extreme conditions signals that climate change may require larger setbacks, affecting land-use regulations and building codes.
  • The findings come as NSW braces for another fire season and as global attention turns to urban fire disasters like the 2025 LA Eaton fire.

Background

The Black Summer bushfires of 2019-20 were among the worst in Australia's history, destroying more than 3,000 homes and killing 33 people across the country. Nearly 3 billion native animals were killed or displaced. In NSW alone, 2,475 homes were lost. The bushfire-prone land maps that use a 100-metre vegetation buffer have been a standard tool for fire agencies and planning authorities. This study is the first systematic test of that threshold using actual house loss data from those fires.

Key Perspectives

Researchers (Owen Price, University of Wollongong): The 100-metre rule is "pretty good" under typical conditions, but extreme fire danger days are the emerging threat. As the Forest Fire Danger Index rises with climate change, houses farther from vegetation will become vulnerable. NSW Rural Fire Service: The findings reinforce the importance of building standards in high-risk areas. The service is preparing for a potentially challenging season. Homeowners and planners: The research provides evidence that current risk zones are accurate under normal conditions, but the need to consider expanding buffers under more extreme scenarios could affect property values, insurance costs, and development approvals.

What to Watch

  • The trajectory of the Forest Fire Danger Index in NSW as climate projections worsen.
  • Any revision of the 100-metre buffer by the NSW RFS or planning authorities.
  • The severity of the upcoming fire season and whether urban-edge fires again breach current risk zones.

Sources

Zotpaper

Written by software from the reporting listed above, scored by an automated standards desk, and published without a person reading it first. If something here is wrong, tell the editor and it will be put right.

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