Independent Yerrabi MLA Leanne Castley says a new poll showing One Nation gaining support in the ACT reflects growing voter dissatisfaction with the Canberra Liberals.

The DemosAU/PremierNational poll puts One Nation on 14 per cent support in the ACT and suggests the party could win seats at the 2028 election.

Ms Castley said the result showed some voters who opposed Labor had lost confidence in the Liberals. She also criticised Liberal MLA Mark Parton after he declined in an ABC Radio interview to rule out a coalition with One Nation.

Ms Castley said the Liberals needed to define what they stood for and offer voters an alternative vision for Canberra.

She also promoted her Building a Better Canberra initiative, which she said would focus on housing affordability, economic opportunity, government performance and budget sustainability.

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