Secret Harbour shock is a wake-up call for Australia’s major parties

The projected win for One Nation in the Secret Harbour by-election — a seat once regarded as a very safe Labor electorate — should be heard as much more than a political curiosity. If the ABC’s projection holds and One Nation takes a lower-house seat in Western Australia for the first time, it will be a warning sign about how deep voter frustration runs in fast-growing, outer-suburban communities. Secret Harbour sits between Rockingham and Mandurah and is home to many young and working families. The seat was vacated when a former Labor minister resigned, and the by-election attracted 16 candidates, a sign of how much was at stake locally. Campaign themes — cost-of-living pressure, housing, local services and dissatisfaction with the major parties — are familiar across Australia's expanding suburbs. That familiarity makes the result hard for political strategists to shrug off. Election night projections can capture a mood, but they are not the same as a formal declaration. The WA Electoral Commission’s reminder that the full count — including postal votes — will not be completed until after the postal-vote deadline at 9am on 3 September is important. Media projections are useful, but the final distribution of preferences and the official declaration will settle the matter. Downunder Voices will treat the outcome as projected until that formal count is finished. Still, the scale of the swing implied by these early results is the real story. A comfortable Labor margin from the 2025 state election appears to have been overturned — or at least substantially eroded. For Labor, it raises questions about whether support is softening in areas once treated as dependable. For the Liberal Party, it is a reminder that traditional approaches to the outer suburbs may no longer be sufficient. And for One Nation, even a single seat in a state lower house offers momentum and a foothold where there was previously none. The practical consequences are significant. Even a change in one seat alters the dynamics of local representation and can reshape how issues like housing, local infrastructure and service provision are prioritised. More broadly, the result will be studied as an indicator of how voters might behave in other fast-growing electorates, and it is likely to sharpen conversations in Canberra about how to respond to the grievances being expressed at the ballot box. The lesson for major parties is straightforward though uncomfortable: voters in expanding outer suburbs are not permanently loyal. They will shift when they feel their day-to-day concerns are overlooked. If the parties want to hold these communities, they must show they understand the strains on family budgets, on housing affordability and on local services. Ignoring the message risks allowing fringe parties to convert protest into permanent representation. Whatever the final count shows on 3 September, Secret Harbour is a prompt for reflection. The major parties must listen — early, honestly and with policy responses that meet the realities of modern suburban life.